Occidental
      Energy Marketing, Inc.
                        5
      Greenways Plaza, Suite 110, Houston, Texas 77046-0521
                          P.O.
      Box 27570, Houston, Texas 77227-7570
                          Phone
      713.215.7000A
      subsidiary of Occidental Petroleum Corporation
  AMENDMENT
 
  TO:    DEB
STEWART - PIONEER NATURAL RESOURCES USA, INC. - FAX NUMBER (972)
969-3574
  FROM:
MARK HAFNER - OCCIDENTAL ENERGY MARKETING, INC. - FAX NUMBER (713)
985-1815
  RE:
                        OCCIDENTAL
      CONTRACT #0403-PNR-13603-P#1
 PIONEER
CONTRACT #OIL-10442
  EFFECTIVE
MAY 1, 2005, OCCIDENTAL AND PIONEER AMEND THE PRICE AND TERM OF THIS CONTRACT
WHEREBY OCCIDENTAL BUYS APPROXIMATELY 1,800 BARRELS PER DAY OF WTI CRUDE OIL
FROM PIONEER TO THE FOLLOWING:
  PRICE: FORMULA PRICE:THE
PRICE HAS THREE COMPONENTS - BASE PRICE PLUS/MINUS ROLL COMPONENT MINUS CUSHING
WTI/MIDLAND WTI SPREAD MINUS LOCATION DIFFERENTIAL.
  BASE PRICE- THE BASE PRICE
SHALL BE THE AVERAGE OF THE MERC SETTLEMENT PRICE DURING THE CALENDAR MONTH OF
THE DELIVERY MONTH. WEEKENDS AND HOLIDAYS SHALL CARRY THE PRICE OF THE PREVIOUS
MERC SETTLEMENT PRICE.
  ROLL COMPONENT- THE
SETTLEMENT PRICES SHALL BE AVERAGED FOR THE ENTIRE MERC TRADE MONTH WHILE
THE DELIVERY MONTH IS THE MERC PROMPT MONTH. THE MONTHS AVERAGED SHALL BE THE
PROMPT (DELIVERY) MONTH AND THE NEXT TWO MONTHS. THE ROLL COMPONENT FOR THE
PROMPT MONTH/SECOND MONTH SHALL BE THE DIFFERENCE BETWEEN THE PROMPT MONTH
AVERAGE MINUS THE SECOND MONTH AVERAGE TIMES A DECIMAL FACTOR DETERMINED BY
DIVIDING THE NUMBER OF CALENDAR DAYS IN THE DELIVERY MONTH THAT THE SECOND MONTH
TRADES ON THE MERC BY THE NUMBER OF CALENDAR DAYS IN THE DELIVERY MONTH. THE
ROLL COMPONENT FOR THE PROMPT MONTH/THIRD MONTH SHALL BE THE DIFFERENCE BETWEEN
THE PROMPT MONTH AVERAGE MINUS THE THIRD MONTH AVERAGE TIMES A DECIMAL FACTOR
THAT IS ONE (1) MINUS THE DECIMAL FACTOR FOR THE PROMPT MONTH/SECOND MONTH. IF
THE SECOND MONTH MERC TRADING IN THE DELIVERY MONTH EXPIRES ON A FRIDAY, THEN
THE WEEKEND AND ANY HOLIDAYS SHALL BE DEEMED AS SECOND MONTH DAYS FOR
DETERMINING THE DECIMAL FACTOR FOR THE PROMPT MONTH/SECOND MONTH.
  CUSHING WTI/MIDLAND WTI SPREAD- PLATTS DAILY HIGH/LOW AVERAGE FOR WTI CUSHING MINUS PLATTS DAILY
HIGH/LOW AVERAGE FOR MIDLAND WTI IS THE DAILY WTI/WTI SPREAD. NOTE: ALL PLATTS
PRICING IS FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE PERIOD
BEGINNING ON THE 26th OF
THE SECOND MONTH PROCEEDING THE DELIVERY MONTH AND ENDING ON THE 25th OF
THE SECOND MONTH PROCEEDING THE DELIVERY MONTH.
  LOCATION DIFFERENTIAL- THIS
IS THE LOCATION DIFFERENTIAL RATE, WHICH INCLUDES WITHOUT LIMITATION
TRANSPORTATION COSTS AND OTHER APPLICABLE TARIFF RATES, FEES AND COSTS, IN
DOLLARS PER BARREL THAT HAS BEEN ESTABLISHED FOR EACH OF THE INDIVIDUAL
PROPERTIES ON THE CONTRACT EXHIBIT A.
  TERM:MAY 1, 2005 THROUGH
DECEMBER 31, 2012. OCCIDENTAL IN ITS SOLE DISCRETION AND UPON SIXTY (60) DAYS
PRIOR WRITTEN NOTICE TO PIONEER, SHALL HAVE THE RIGHT TO MAKE ADJUSTMENTS TO THE
LOCATION DIFFERENTIAL ONCE EACH CALENDAR YEAR. WITHIN FIFTEEN (15) DAYS AFTER
THE DATE OF SUCH NOTICE PIONEER SHALL PROVIDE WRITTEN CONFIRMATION OF ACCEPTANCE
OR REJECTION OF THE ADJUSTED LOCATION DIFFERENTIAL. IF THE PARTIES DO NOT
MUTUALLY AGREE TO AN ADJUSTED LOCATION DIFFERENTIAL BY THE END OF THE
SIXTY-DAY
  
  PERIOD,
EITHER PARTY MAY TERMINATE THIS AGREEMENT UPON SIXTY (60) DAYS PRIOR WRITTEN
NOTICE.
  ENCLOSED
PLEASE FIND THE EXHIBIT "A" TO THE ABOVE-REFERENCED CONTRACT. WE APPRECIATE YOUR
BUSINESS AND LOOK FORWARD TO OTHER BUSINESS IN THE FUTURE.
   APPROVED
      BY:
                        /s/
      John t.
      mcwhorterJohn
      t. mcwhorteroccidental
      energy marketing, inc.APPROVED
      BY:
                        /s/Hershal K.
      Wolfepioneer
      natural resources usa, inc.Hershal
      K. WolfeDirector
      of Marketing
  
  EXHIBIT
"A"
 OEMI'S
Contract #0403-PNR-13603-P#1
 Contract
 Allegro
Contract #119321 (formerly 114658)
  Crude
      Type
                        
                        Transporter
                        
                        Start
      Date
                        
                        Carrier
                          Lease
      ID #
                        
                        EMOCRC
                        
                        RPC
                        
                        DO
                        
                        Decimal
                        
                        Contract
      fl
                        
                        Operator
                        
                        Lease
      Name
                        
                        OXY
      ALLEGO LEASE NAME
                        
                        OXY
      Lease #
                        
                        County
                        
                        State
                        
                        B/D
                        
                        DifferentialWTI
                        
                        Genesis
      Trks
                        
                        03/01/2004
                        
                        53898
                        
                        56377
                        
                        56377
                        
                        75451
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      SPRABERRY TR 1
                        
                        PRESTON
      SPRABERRY TR 1
                        
                        742055350001PITS
                        
                        Midland
                        
                        TX
                        
                        1
                        
                        0.60WTI
                        
                        Genesis
      Trks
                        
                        03/01/2004
                        
                        53399
                        
                        55583
                        
                        76617
                        
                        75046
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      SPRABERRY DEAN TR 19 A
                        
                        PRESTON
      SPRBY DEAN TR 19 A
                        
                        74205535019APITS
                        
                        Midland
                        
                        TX
                        
                        36
                        
                        0.60WTI
                        
                        Genesis
      Trks
                        
                        03/01/2004
                        
                        52546
                        
                        55583
                        
                        68287
                        
                        75068
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      SPRABERRY DEAN TR 41
                        
                        PRESTON
      SPRBY DEAN TR 41
                        
                        742055350041PITS
                        
                        Midland
                        
                        TX
                        
                        3
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        291036
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 20B
                        
                        PRESTON
      SPRABERRY UT
                        
                        742055350208PIPS
                        
                        Midland
                        
                        TX
                        
                        7
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        841253
                        
                        56377
                        
                        65563
                        
                        75450
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      SPRABERRY UNIT PSU CB
                        
                        PRESTON
      SPRABERRY UT PSU-C.B.
                        
                        7420553500CBPIPS
                        
                        Midland
                        
                        TX
                        
                        57
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200006
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 15
                        
                        PRESTON
      SPRABERRY UT TR 15
                        
                        742055350015PIPS
                        
                        Midland
                        
                        TX
                        
                        34
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200007
                        
                        55563
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 16
                        
                        PRESTON
      SPRABERRY UT TR 16
                        
                        742055350016PIPS
                        
                        Midland
                        
                        TX
                        
                        27
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251054
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 28
                        
                        PRESTON
      SPRABERRY UT TR 28
                        
                        742055350028PIPS
                        
                        Midland
                        
                        TX
                        
                        22
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200031
                        
                        56377
                        
                        60638
                        
                        75453
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 32A
                        
                        PRESTON
      SPRABERRY UT TR 32A
                        
                        74205535032APIPS
                        
                        Midland
                        
                        TX
                        
                        23
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200031
                        
                        56377
                        
                        60638
                        
                        75453
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 3
                        
                        PRESTON
      SPRABERRY UT TR 32A
                        
                        74205535032APIPS
                        
                        Midland
                        
                        TX
                        
                        6
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200003
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 11
                        
                        PRESTON
      SPRABERRY UT TR 11
                        
                        742055350011PIPS
                        
                        Midland
                        
                        TX
                        
                        33
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200004
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1
      00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 12A
                        
                        PRESTON
      SPRABERRY UT TR 12A
                        
                        74205535012APIPS
                        
                        Midland
                        
                        TX
                        
                        12
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200005
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 14
                        
                        PRESTON
      SPRABERRY UT TR 14
                        
                        742055350014PIPS
                        
                        Midland
                        
                        TX
                        
                        32
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200006
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 17
                        
                        PRESTON
      SPRABERRY UT TR 17
                        
                        742055350017PIPS
                        
                        Midland
                        
                        TX
                        
                        77
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200009
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 18
                        
                        PRESTON
      SPRABERRY UT TR 18
                        
                        742055350018PIPS
                        
                        Midland
                        
                        TX
                        
                        50
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251057
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 20
                        
                        PRESTON
      SPRABERRY UT TR 20
                        
                        742055350020PIPS
                        
                        Midland
                        
                        TX
                        
                        25
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200011
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 21
                        
                        PRESTON
      SPRABERRY UT TR 21
                        
                        742055350021
      PIPS
                        
                        Midland
                        
                        TX
                        
                        100
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200013
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 21B
                        
                        PRESTON
      SPRABERRY UTTR21B
                        
                        74205535021BPIPS
                        
                        Midland
                        
                        TX
                        
                        34
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200012
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 22
                        
                        PRESTON
      SPRABERRY UT TR 22
                        
                        742055350022PIPS
                        
                        Midland
                        
                        TX
                        
                        14
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200014
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 23B
                        
                        PRESTON
      SPRABERRY UT TR 23B
                        
                        74205535023BPIPS
                        
                        Midland
                        
                        TX
                        
                        21
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200015
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 24
                        
                        PRESTON
      SPRABERRY UT TR 24
                        
                        742055350024PIPS
                        
                        Midland
                        
                        TX
                        
                        19
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200016
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 25
                        
                        PRESTON
      SPRABERRY UT TR 25
                        
                        742055350025PIPS
                        
                        Midland
                        
                        TX
                        
                        47
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200017
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 28
                        
                        PRESTON
      SPRABERRY UT TR 26
                        
                        742055350026PIPS
                        
                        Midland
                        
                        TX
                        
                        64
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200016
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 27
                        
                        PRESTON
      SPRABERRY UT TR 27
                        
                        742055350027PIPS
                        
                        Midland
                        
                        TX
                        
                        15
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251062
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 29
                        
                        PRESTON
      SPRABERRY UT TR 29
                        
                        742055350029PIPS
                        
                        Midland
                        
                        TX
                        
                        48
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251066
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 30
                        
                        PRESTON
      SPRABERRY UT TR 30
                        
                        742055350030PIPS
                        
                        Midland
                        
                        TX
                        
                        33
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251055
                        
                        55583
                        
                        55563
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 31
                        
                        PRESTON
      SPRABERRY UT TR 31
                        
                        742055350031PIPS
                        
                        Midland
                        
                        TX
                        
                        38
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        845316
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 31B
                        
                        PRESTON
      SPRABERRY UT TR 31B
                        
                        74205535031
      BPIPS
                        
                        Midland
                        
                        TX
                        
                        39
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200019
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 33
                        
                        PRESTON
      SPRABERRY UT TR 33
                        
                        742055350033PIPS
                        
                        Midland
                        
                        TX
                        
                        91
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200020
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 33B
                        
                        PRESTON
      SPRABERRY UT TR 33B
                        
                        74205535033BPIPS
                        
                        Midland
                        
                        TX
                        
                        26
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200021
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 34
                        
                        PRESTON
      SPRABERRY UT TR 34
                        
                        742055350034PIPS
                        
                        Midland
                        
                        TX
                        
                        40
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200022
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 34A
                        
                        PRESTON
      SPRABERRY UTTR34A
                        
                        74205535034APIPS
                        
                        Midland
                        
                        TX
                        
                        79
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200023
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 34B
                        
                        PRESTON
      SPRABERRY UTTR34B
                        
                        74205535034BPIPS
                        
                        Midland
                        
                        TX
                        
                        11
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        845753
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 37-10
                        
                        PRESTON
      SPRABERRY UT TR 37A
                        
                        74205535037APIPS
                        
                        Midland
                        
                        TX
                        
                        8
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251045
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 38
                        
                        PRESTON
      SPRABERRY UT TR 38
                        
                        742055350038PIPS
                        
                        Midland
                        
                        TX
                        
                        31
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251046
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 39
                        
                        PRESTON
      SPRABERRY UT TR 39
                        
                        742055350039PIPS
                        
                        Midland
                        
                        TX
                        
                        83
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251053
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 40
                        
                        PRESTON
      SPRABERRY UT TR 40
                        
                        742055350040PIPS
                        
                        Midland
                        
                        TX
                        
                        56
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        845755
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 40B
                        
                        PRESTON
      SPRABERRY UT TR 40B
                        
                        74205535040BPIPS
                        
                        Midland
                        
                        TX
                        
                        7
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251056
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 41
                        
                        PRESTON
      SPRABERRY UT TR 41
                        
                        742055350041PIPS
                        
                        Midland
                        
                        TX
                        
                        248
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        251043
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 42
                        
                        PRESTON
      SPRABERRY UT TR 42
                        
                        7420553500034PIPS
                        
                        Midland
                        
                        TX
                        
                        34
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200024
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 43A
                        
                        PRESTON
      SPRABERRY UT TR 43A
                        
                        74205535043APIPS
                        
                        Midland
                        
                        TX
                        
                        B4
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200026
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 44
                        
                        PRESTON
      SPRABERRY UT TR 44
                        
                        742055350C44PIPS
                        
                        Midland
                        
                        TX
                        
                        24
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200027
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 44 B
                        
                        PRESTON
      SPRABERRY UT TR 44 B
                        
                        74205535044BPIPS
                        
                        Midland
                        
                        TX
                        
                        7
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200028
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 45
                        
                        PRESTON
      SPRABERRY UT TR 45A
                        
                        74205535045APIPS
                        
                        Midland
                        
                        TX
                        
                        42
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200029
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 45B
                        
                        PRESTON
      SPRABERRY UT TR 45B
                        
                        74205535045BPIPS
                        
                        Midland
                        
                        TX
                        
                        13
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200030
                        
                        58377
                        
                        60838
                        
                        75454
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 4 (46A)
                        
                        PRESTON
      SPRABERRY UT TR 46A
                        
                        74205535046APIPS
                        
                        Midland
                        
                        TX
                        
                        9
                        
                        060WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        200002
                        
                        58377
                        
                        60837
                        
                        75452
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC
                        
                        PRESTON
      SPRABERRY UNIT TR 7
                        
                        PRESTON
      SPRABERRY UT-7
                        
                        74205535O0O7PIPS
                        
                        Midland
                        
                        TX
                        
                        4
                        
                        0.60WTI
                        
                        Centurion
      PI
                        
                        03/01/2004
                        
                        298808
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC
                        
                        PRESTON
      DEAN SPBY UNIT TR 37B
                        
                        TXL
      -M- PRESTON SPBY UT 298808
                        
                        74205535037BPIPS
                        
                        Midland
                        
                        TX
                        
                        18
                        
                        0.601816
   
  Occidental
      Energy Marketing, Inc.
                        5
      Greenway Plaza, Suite 110, Houston, Texas 77046-0521
                          P.O.
      Box 27570, Houston, Texas 77227-7570
                          Phone
      713.215.7000A
      subsidiary of Occidental Petroleum Corporation
 
  VIA FAX:
972-969-3574
  TO:
                        DEB
      STEWART - PIONEER NATURAL RESOURCES USA, INC. - PHONE
      972-969-3855
 
 FROM:
                        MARK
      HAFNER- OCCIDENTAL ENERGY MARKETING, INC. - PHONE
    432-685-5884
 
 REFERENCE:
                        OCCIDENTAL CONTRACT NUMBER:0403-PNR-13603-P
 PIONEER
NATURAL RESOURCES USA, INC. CONTRACT NUMBER:
  THIS FAX
CONFIRMS THE AGREEMENT BETWEEN DEB STEWART OF PIONEER NATURAL RESOURCES USA,
INC. AND MARK HAFNER OF OCCIDENTAL ENERGY MARKETING, INC. ON FEBRUARY 1, 2004.
THE FOLLOWING DETAILS ARE OCCIDENTAL'S UNDERSTANDING:
  SELLER:
                        PIONEER
      NATURAL RESOURCES USA, INC.
("PIONEER")
 BUYER:
                        OCCIDENTAL
      ENERGY MARKETING, INC.
("OCCIDENTAL")
  1.
                          VOLUME:     APPROXIMATELY
      1,816 BARRELS PER DAY EXACT VOLUME EQUAL TO THE PRODUCTION FROM THE LEASES
      ON ATTACHED EXHIBIT "A"
 
 2.
                        QUALITY/GRADE:     WEST
      TEXAS INTERMEDIATE
  3.
                        DELIVERY
      POINT:     TITLE AND RISK OF LOSS SHALL
      PASS FROM PIONEER TO OCCIDENTAL AS THE CRUDE OIL ENTERS THE FACILITIES OF
      TROJAN PIPELINE AND OCCIDENTAL'S DESIGNATED
  TRUCKER.
  4.
                        TERM:     MARCH  1-
      31, 2004 AND  CONTINUING MONTH TO MONTHTHEREAFTER
      SUBJECT TO A 30 DAY ADVANCE WRITTEN NOTICE OF CANCELLATION BY EITHER
      PARTY.
  5.
                        PRICE:     OXY
      AGREES TO PAY PIONEER A PRICE PER BARREL EQUAL
  TO
 ONE OF
THE THREE PRICING FORMULAS DESCRIBED BELOW. PIONEER SHALL HAVE THE RIGHT TO
ELECT WHICH PRICING FORMULA IS USED ON A QUARTERLY BASIS. PIONEER SHALL NOTIFY
OXY IN WRITING AT LEAST FIVE (5) DAYS PRIOR TO THE BEGINNING OF THE FIRST NYMEX
TRADING MONTH OF ANY QUARTER. THE QUARTERLY PRICING FORMULA WILL DEFAULT TO THE
PRECEDING QUARTER'S PRICING FORMULA IF PIONEER NEGLECTS TO NOTIFY OXY BY FIVE
(5) DAYS PRIOR TO THE BEGINNING OF THE NYMEX TRADING MONTH FOR ANY GIVEN
QUARTER.
  IT IS
HEREBY AGREED THAT PRICING FORMULA 3 WILL BE USED FOR MARCH 2004 AND WILL BE
USED FOR THE REMAINDER OF THE SECOND QUARTER OF 2004.
  FORMULA1 - PLATT'S TRADING MONTH POSTING PLUS
(MIDLAND)
  PRICE: KOCH PETROLEUM GROUP L.P. MONTHLY EDQ
POSTED PRICE FOR WEST TEXAS/NEW MEXICO INTERMEDIATE DEEMED 40.0 DEGREES FOR THE
MONTH OF DELIVERY, PLUS THE AVERAGE OF THE *PLATTS DAILY ASSESSMENTS OF WTI-P
PLUS LESS THE DIFFERENCE BETWEEN (PLATTS WTI-CUSHING LESS PLATTS WTI-MIDLAND)
PLUS THE DELTA DOLLARS PER BARREL SET OUT ON EXHIBIT "A".
  * NOTE
ALL PLATTS PRICING IS FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE
PERIOD BEGINNING ON THE 26� OF THE SECOND MONTH PROCEEDING THE DELIVERY MONTH
AND ENDING ON THE 25� OF THE MONTH PRECEEDING THE DELIVERY MONTH (CARRIED TO 4
DECIMAL PLACES).
  
  FORMULA
2 - PLATT'S TRADING MONTH WT (MIDLAND)
  THE
AVERAGE OF THE MIDPOINTS OF THE ASSESSMENTS FOR PLATT'S TRADING MONTH WTI AT
MIDLAND, THE PLATT'S TRADING MIDLAND WTI VALUE SHALL BE THE MEAN DAILY AVERAGE,
AS PUBLISHED BY PLATTS DURING THE PERIOD BEGINNING ON THE 26� OF THE SECOND
MONTH PROCEEDING THE DELIVERY MONTH AND ENDING ON THE 25� OF THE MONTH
PRECEEDING THE DELIVERY MONTH (CARRIED TO 4 DECIMAL PLACES), PLUS THE DELTA
DOLLARS PER BARREL SET OUT ON EXHIBIT "A".
  FORMULA
3 - NYMEX TRADING MONTH DOMESTIC LIGHT SWEET (MIDLAND)
  THE
AVERAGE OF THE DAILY NYMEX SETTLEMENT PRICE FOR THE NEAR MONTH LIGHT SWEET CRUDE
OIL CONTRACT FOR THE PERIOD THAT THE DELIVERY MONTH TRADES AS THE PROMPT MONTH
(I.E. NYMEX TRADING MONTH), LESS THE DIFFERENCE BETWEEN (PLATTS WTI-CUSHING LESS
PLATTS WTI-MIDLAND) PLUS THE DELTA DOLLARS PER BARREL SET OUT ON EXHIBIT
"A".
  * NOTE
ALL PLATTS PRICING IS FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE
PERIOD BEGINNING ON THE 26TH OF THE SECOND MONTH PROCEEDING THE DELIVERY MONTH
AND ENDING ON THE 25TH OF THE MONTH PRECEEDING THE DELIVERY MONTH (CARRIED TO 4
DECIMAL PLACES).
  6.
                        PAYMENT:PAYMENT UNDER
      THIS CONTRACT SHALL BE MADE BY WIRE TRANSFER ON THE TWENTIETH (20TH)
      CALENDAR DAY OF THE MONTH FOLLOWING THE MONTH OF DELIVERY LESS APPLICABLE
      TAXES. IF THE PAYMENT DUE DATE FALLS ON A SATURDAY OR BANK HOLIDAY (EXCEPT
      MONDAY), PAYMENT WILL BE MADE ON THE PRECEDING BUSINESS DAY. IF PAYMENT
      DUE DATE FALLS ON A SUNDAY OR MONDAY HOLIDAY, PAYMENT WILL BE MADE ON THE
      FOLLOWING BUSINESS DAY. PAYMENT SHOULD BE MADE TO BANK OF AMERICA, FOR THE
      ACCOUNT OF PIONEER NATURAL RESOURCES USA, INC., ACCOUNT NO. XXXXXXXXXX,
      ABA NO. XXXXXXXXX.
  7.
                        COMMENTS AND SPECIAL
      PROVISIONS:CONOCO'S GENERAL TERMS AND CONDITIONS TO
      APPLY.
  APPROVED
      BY:
                        /s/
      John t.
      mcwhorterJohn
      t. mcwhorteroccidental
      energy marketing, inc.APPROVED
      BY:
                        /s/Hershal K.
      Wolfepioneer
      natural resources usa, inc.Hershal
      K. WolfeDirector
      of Marketing
 
  EXHIBIT
"A"
 OEMI'S
Contract #0403-PNR-13603-P
 Contract
#
 Allegro
Contract #114658
 
  Crude
      Type
                        
                        Transporter
                        
                        Start
      Date
                        
                        Carrrier
      Lease ID #
                        
                        EMOC
      RC
                        
                        RPC
                        
                        DO
                        
                        Decimal
                        
                        Old
      XOM Contract*
                        
                        Operalor
                        
                        Lease
      Name
                        
                        OXY
      ALLEGO LEASE NAME
                        
                        OXY
      Lease*
                        
                        County
                        
                        State
                        
                        B/D
                        
                        Lease
      DeltaWTI
                        
                        Genesis
      Trks
                        
                        03/01/2004
                        
                        53898
                        
                        56377
                        
                        56377
                        
                        75451
                        
                        1
      00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA, INC.
                        
                        PRESTON
      SPRABERRYTR 1
                        
                        PRESTON
      SPRABERRYTR 1
                        
                        742055350001
      PITS
                        
                        Midland
                        
                        TX
                        
                        1
                        
                        -0.60WTI
                        
                        Genesis
      Trks
                        
                        03/01/2004
                        
                        53399
                        
                        55583
                        
                        76617
                        
                        75046
                        
                        1,00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA. INC.
                        
                        PRESTON
      SPRABERRY DEAN TR 19 A
                        
                        PRESTON
      SPRBY DEAN TR 19 A
                        
                        74205535019APITS
                        
                        Midland
                        
                        TX
                        
                        38
                        
                        -0.60WTI
                        
                        Genesis
      Trks
                        
                        03/01/2004
                        
                        52546
                        
                        55583
                        
                        68287
                        
                        75068
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA. INC.
                        
                        PRESTON
      SPRABERRY DEAN TR 41
                        
                        PRESTON
      SPRBY DEAN TR 41
                        
                        74205535004tPITS
                        
                        Midland
                        
                        TX
                        
                        3
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        291036
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 20B
                        
                        PRESTON
      SPRABERRY UT
                        
                        74205535020BPIPS
                        
                        Midland
                        
                        TX
                        
                        7
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        841253
                        
                        56377
                        
                        65563
                        
                        75450
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA. INC.
                        
                        PRESTON
      SPRABERRY UNIT PSUCB
                        
                        PRESTON
      SPRABERRY UT PSU-C.B.
                        
                        7420553500CBPIPS
                        
                        Midland
                        
                        TX
                        
                        57
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200006
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 15
                        
                        PRESTON
      SPRABERRY UT TR 15
                        
                        742055350015PIPS
                        
                        Midland
                        
                        TX
                        
                        34
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200007
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 16
                        
                        PRESTON
      SPRABERRY UT TR 16
                        
                        742055350016PIPS
                        
                        Midland
                        
                        TX
                        
                        27
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251054
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 28
                        
                        PRESTON
      SPRABERRY UT TR 28
                        
                        742055350028PIPS
                        
                        Midland
                        
                        TX
                        
                        22
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200031
                        
                        56377
                        
                        60638
                        
                        75453
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 32A
                        
                        PRESTON
      SPRABERRY UT TR 32A
                        
                        74205535032APIPS
                        
                        Midland
                        
                        TX
                        
                        23
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200031
                        
                        56377
                        
                        60638
                        
                        75453
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 3
                        
                        PRESTON
      SPRABERRY UT TR 32A
                        
                        74205535032APIPS
                        
                        Midland
                        
                        TX
                        
                        6
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200003
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 11
                        
                        PRESTON
      SPRABERRY UT TR 11
                        
                        742055350011
      PIPS
                        
                        Midland
                        
                        TX
                        
                        33
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200004
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 12A
                        
                        PRESTON
      SPRABERRY UT TR 12A
                        
                        74205535012APIPS
                        
                        Midland
                        
                        TX
                        
                        12
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200005
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 14
                        
                        PRESTON
      SPRABERRY UT TR 14
                        
                        742055350014PIPS
                        
                        Midland
                        
                        TX
                        
                        32
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200008
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 17
                        
                        PRESTON
      SPRABERRY UT TR 17
                        
                        742055350017PIPS
                        
                        Midland
                        
                        TX
                        
                        77
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200009
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 18
                        
                        PRESTON
      SPRABERRY UT TR 18
                        
                        742055350018PIPS
                        
                        Midland
                        
                        TX
                        
                        50
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251057
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 20
                        
                        PRESTON
      SPRABERRY UT TR 20
                        
                        742055350020PIPS
                        
                        Midland
                        
                        TX
                        
                        25
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200011
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 21
                        
                        PRESTON
      SPRABERRY UT TR 21
                        
                        742055350021PIPS
                        
                        Midland
                        
                        TX
                        
                        100
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200013
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 21B
                        
                        PRESTON
      SPRABERRY UT TR 21B
                        
                        74205535021BPIPS
                        
                        Midland
                        
                        TX
                        
                        34
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200012
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 22
                        
                        PRESTON
      SPRABERRY UT TR 22
                        
                        742055350022PIPS
                        
                        Midland
                        
                        TX
                        
                        14
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200014
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 23B
                        
                        PRESTON
      SPRABERRY UT TR 23B
                        
                        74205535023BPIPS
                        
                        Midland
                        
                        TX
                        
                        21
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200015
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 24
                        
                        PRESTON
      SPRABERRY UT TR 24
                        
                        742055350024PIPS
                        
                        Midland
                        
                        TX
                        
                        19
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200016
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 25
                        
                        PRESTON
      SPRABERRY UT TR 25
                        
                        742055350025PIPS
                        
                        Midland
                        
                        TX
                        
                        47
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200017
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 26
                        
                        PRESTON
      SPRABERRY UT TR 26
                        
                        742055350026PIPS
                        
                        Midland
                        
                        TX
                        
                        64
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200018
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 27
                        
                        PRESTON
      SPRABERRY UT TR 27
                        
                        742055350027PIPS
                        
                        Midland
                        
                        TX
                        
                        15
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251062
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 29
                        
                        PRESTON
      SPRABERRY UT TR 29
                        
                        742055350029PIPS
                        
                        Midland
                        
                        TX
                        
                        48
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251066
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 30
                        
                        PRESTON
      SPRABERRY UT TR 30
                        
                        742055350030PIPS
                        
                        Midland
                        
                        TX
                        
                        33
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251055
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 31
                        
                        PRESTON
      SPRABERRY UT TR 31
                        
                        742055350031PIPS
                        
                        Midland
                        
                        TX
                        
                        38
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845316
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 31B
                        
                        PRESTON
      SPRABERRY UT TR 31B
                        
                        74205535031BPIPS
                        
                        Midland
                        
                        TX
                        
                        39
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200019
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 33
                        
                        PRESTON
      SPRABERRY UT TR 33
                        
                        742055350033PIPS
                        
                        Midland
                        
                        TX
                        
                        9t
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200020
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 33B
                        
                        PRESTON
      SPRABERRY UT TR 33B
                        
                        74205535033BPIPS
                        
                        Midland
                        
                        TX
                        
                        28
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200021
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 34
                        
                        PRESTON
      SPRABERRY UT TR 34
                        
                        742055350034PIPS
                        
                        Midland
                        
                        TX
                        
                        40
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200022
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 34A
                        
                        PRESTON
      SPRABERRY UT TR 34A
                        
                        74205535034APIPS
                        
                        Midland
                        
                        TX
                        
                        79
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200023
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 34B
                        
                        PRESTON
      SPRABERRY UT TR 34B
                        
                        74205535034BPIPS
                        
                        Midland
                        
                        TX
                        
                        11
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845753
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 37-10
                        
                        PRESTON
      SPRABERRY UT TR 37A
                        
                        74205535037APIPS
                        
                        Midland
                        
                        TX
                        
                        8
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251045
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 38
                        
                        PRESTON
      SPRABERRY UT TR 38
                        
                        742055350038PIPS
                        
                        Midland
                        
                        TX
                        
                        31
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251046
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 39
                        
                        PRESTON
      SPRABERRY UT TR 39
                        
                        742055350039PIPS
                        
                        Midland
                        
                        TX
                        
                        83
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251053
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 40
                        
                        PRESTON
      SPRABERRY UT TR 40
                        
                        742055350040PIPS
                        
                        Midland
                        
                        TX
                        
                        56
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845755
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 40B
                        
                        PRESTON
      SPRABERRY UT TR 40B
                        
                        74205535040BPIPS
                        
                        Midland
                        
                        TX
                        
                        7
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251056
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 41
                        
                        PRESTON
      SPRABERRY UT TR 41
                        
                        742055350041PIPS
                        
                        Midland
                        
                        TX
                        
                        248
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        251043
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 42
                        
                        PRESTON
      SPRABERRY UT TR 42
                        
                        7420553500034PIPS
                        
                        Midland
                        
                        TX
                        
                        34
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200024
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 43A
                        
                        PRESTON
      SPRABERRY UT TR 43A
                        
                        74205535043APIPS
                        
                        Midland
                        
                        TX
                        
                        64
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200026
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 44
                        
                        PRESTON
      SPRABERRY UT TR 44
                        
                        742055350044PIPS
                        
                        Midland
                        
                        TX
                        
                        24
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200027
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 44 B
                        
                        PRESTON
      SPRABERRY UT TR 44 B
                        
                        74205535044BPIPS
                        
                        Midland
                        
                        TX
                        
                        7
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200028
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 45
                        
                        PRESTON
      SPRABERRY UT TR 45A
                        
                        74205535045APIPS
                        
                        Midland
                        
                        TX
                        
                        42
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200029
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 45B
                        
                        PRESTON
      SPRABERRY UT TR 45B
                        
                        74205535045BPIPS
                        
                        Midland
                        
                        TX
                        
                        13
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200030
                        
                        56377
                        
                        60838
                        
                        75454
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA, INC.
                        
                        PRESTON
      DEAN SPRABERRY UNIT TR 4 (46A)
                        
                        PRESTON
      SPRABERRY UT TR 46A
                        
                        74205535046APIPS
                        
                        Midland
                        
                        TX
                        
                        9
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200002
                        
                        56377
                        
                        60837
                        
                        75452
                        
                        1.00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES. USA. INC.
                        
                        PRESTON
      SPRABERRY UNIT TR 7
                        
                        PRESTON
      SPRABERRY UT-7
                        
                        742055350007PIPS
                        
                        Midland
                        
                        TX
                        
                        4
                        
                        -0.60WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        298808
                        
                        55583
                        
                        55583
                        
                        75045
                        
                        1
      00000000
                        
                        B015
                        
                        PIONEER
      NATURAL RES USA. INC.
                        
                        PRESTON
      DEAN SPBY UNIT TR 37B
                        
                        TXL
      -M- PRESTON SPBY UT 298808
                        
                        74205535037BPIPS
                        
                        Midland
                        
                        TX
                        
                        18
                        
                        -0.601816
 
  Occidental
      Energy Marketing, Inc.
                        
                        5
      Greenway Plaza, Suite 110, Houston, Texas 77046-0521A
      subsidiary of Occidental Petroleum Corporation
                        
                        P.
      O. Box 27570, Houston, Texas 77227-7570Phone
      713.215.7000
 
  CRUDE OIL CONTRACT AMENDMENT No.3
 VIA
FAX:
 TO:
                        Pioneer
      Natural Resources USA, Inc.
 Attn: Contract Management
Services
 Fax: (972)969-3574
 Trader: Deb Stewart
 
 FROM:
                        Occidental
      Energy Marketing, Inc.
 Trader: Marc Abbott
 
 RE:
                        Occidental
      Contract # 0403-PNR-13606-P
                        Amendment
      #3
  This
Amendment Number 3 to the Crude Oil Contract between Occidental Energy
Marketing, Inc. ("OEMI") and Pioneer Natural Resources USA, Inc.
("Counterparty") dated March, 2004 (the "Contract") is entered into as of
December 16, 2009.
  For
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged and agreed, the Parties agree that the Contract is hereby amended
effective December 1, 2009 as set forth below.
 
 Delete
the Arthur Judkins A lease from the contract and Exhibit "A" due to this lease
being commingled into the Judkins H 1, 2 lease.
   All
other terms of the agreement are unchanged.
  
 Agreed
to and approved by:
 OEMI
   /s/ Marc
Abbott
     Agreed
to and approved by:
 Pioneer
Natural Resources USA, Inc.
  
 /s/ Hershal K. Wolfe
 Hershal
K. Wolfe
 Vice
President Marketing
 
  12/16/2009
  
  Allegro
Contract*     19307
 Crude
      Type
                          Transporter
                          Start
      Date
                          Carrier
      Lease ID*
                          EMOC
      RC
                          RPC
                          do
                          Decimal
                          Old
      XOM Contract #
                          Operator
                          Lease
      Name
                          OXYALLEOO LEASE NAME
                          OXYLease
      #
                          County
                          State
                          BVD
                          LocationWTI
                          Genesis
      Trks
                          03/01/2004
                          53261
                          58525
                          58525
                          76928
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          CARLETON
      B
                          CARLETON
      B
                          742054790000PITS
                          Upton
                          TX
                          4
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57041
                          56151
                          58151
                          75194
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          CARUSS
      JUDKINS
                          CARLISS
      JUDKINS
                          742054800000PITS
                          Midland
                          TX
                          16
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57050
                          56129
                          56129
                          75184
                          1.00000000
                          B008D
                          POINEER
      NATURAL RES. USA, INC.
                          E E
      EILAND B
                          E E
      EILAND B
                          742054950000PITS
                          Midland
                          TX
                          4
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          50703
                          55564
                          68208
                          75088
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA
      DEAN TR 1
                          GERMANIA
      TRACT 1
                          742054990001PITS
                          Midland
                          TX
                          132
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          58537
                          55584
                          68208
                          75088
                          0.44733000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA
      UNIT TR 113
                          GERMANIA
      UTTR113
                          742055000000PITS
                          Midland
                          TX
                          95
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67195
                          78066
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UTTR
      1
                          GERMANIA
      UTTR
      113
                          742055000000RTS
                          Midland
                          TX
                          35
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          87222
                          78067
                          0.13455600
                          B008D
                          PIONEER
      NATURAL. RES. USA, INC.
                          GERMANIA-SPRABERRY
      UTTR
      2
                          GERMANIA
      UTTR
      113
                          742055000000PITS
                          Midland
                          TX
                          10
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67223
                          78068
                          0.23009200
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UTTR
      3
                          GERMANIA
      UTTR
      113
                          742055000000PITS
                          Midland
                          TX
                          18
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67225
                          78069
                          0.12876100
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UTTR
      4
                          GERMANIA
      UTTR
      113
                          742055000000PITS
                          Midland
                          TX
                          10
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          87227
                          78070
                          0.03764500
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UTTR
      5
                          GERMANIA
      UTTR
      113
                          742055000000PITS
                          Midland
                          TX
                          3
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67228
                          78071
                          0.02161600
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UT TR 6
                          GERMANIA
      UTTR
      113
                          742055000000PITS
                          Midland
                          TX
                          1
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          50499
                          56033
                          56033
                          75148
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          JUDKINS
      H 1,2
                          JUDWNS
      H 1,2
                          742055130000PITS
                          Midland
                          TX
                          11
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          53259
                          59466
                          61707
                          76895E
                          1,00000000
                          B008D
                          RONEER
      NATURAL RES. USA. INC.
                          MOBIL
      NEAL 34
                          MOBIL
      NEAL 34
                          742055210000PITS
                          Upton
                          TX
                          4
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          
                          52571
                          52571
                          73911
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          NAIL
      T
                          NAILT
                          742055250000PITS
                          Martin
                          TX
                          4
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          53260
                          59466
                          61709
                          768B5F
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          NEAL
      34
                          NEAL
      34
                          742055260000PITS
                          Upton
                          TX
                          1
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57044
                          56378
                          56378
                          75455
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          O�DANIEL
      COMMINGLED
                          ODAN1EL
      COMMINGLED
                          742055330000PITS
                          Midland
                          TX
                          96
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57670
                          56102
                          56102
                          75178
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SNOW
      DEN A 1-5
                          SNOW
      DEN A 1-5
                          742055450000PITS
                          Midland
                          TX
                          42
                          0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57051
                          76253
                          76253
                          52840
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          WALTON
      JUDKINS B
                          WALTON
      JUDWNS B
                          742055550000PITS
                          Midland
                          TX
                          3
                          0.60WTI
                          TEPPCO
      PI
                          03/01/2004
                          
                          56063
                          56063
                          75161
                          100000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          DL
      HUTT SEC 26
                          DL
      HUTT SEC 26
                          742054860000PIPS
                          Midland
                          TX
                          17
                          0.60WTI
                          TEPPC
      Pl
                          03/01/2004
                          
                          61387
                          61387
                          75182
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES. USA, INC
                          DL
      HUTT SEC 28
                          DL
      HUTT SEC 28
                          742054870000PIPS
                          Midland
                          TX
                          7
                          0
      60WTI
                          TEPPCO
      PI
                          03/01/2004
                          
                          56147
                          56147
                          75192
                          1.06000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC
                          JADEE
                          JADEE
                          742055100000PIPS
                          Midland
                          TX
                          5
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          295904
                          56148
                          56148
                          75193
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA. INC.
                          ARTHUR
      JUDKINS
                          ARTHUR
      JUDWNS
                          742054720000PIPS
                          Midland
                          TX
                          17
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          294202
                          26329
                          26329
                          75189
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES. USA. INC.
                          BESSIE
      FREEMAN
                          BESSIE
      FREEMAN
                          742054730000PIPS
                          Midland
                          TX
                          8
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          251029
                          29496
                          29496
                          75042
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          FREEMAN
      A
                          FREEMAN
      A
                          742054980000PIPS
                          Midland
                          TX
                          19
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845114
                          56379
                          60637
                          75456
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDWFF
      DEAN UNIT TR 17
                          MIDKIFF
      DEAN UTTR17
                          742055190017PIPS
                          Midland
                          TX
                          18
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645102
                          56379
                          60631
                          75467
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDWFF
      DEAN UNIT TR 23
                          MIDKIFF
      DEAN UTTR
      23
                          742055190023PIPS
                          Midland
                          TX
                          19
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845131
                          56379
                          60636
                          75460
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDWFF
      DEAN UNIT TR 24
                          MIDKIFF
      DEAN UTTR
      24
                          742055190024PIPS
                          Midland
                          TX
                          19
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845101
                          56379
                          50630
                          75468
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES. USA. INC.
                          MIDWFF
      DEAN UNIT TR 25
                          MIDKIFF
      DEAN UTTR
      25
                          742055190025PIPS
                          Midland
                          TX
                          19
                          0.60WTI
                          Centurion
      Pt
                          03/01/2004
                          845112
                          56379
                          60634
                          75461
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDWFF
      DEAN UNIT TR 32
                          MIDKIFF
      DEAN UT TR32
                          742055190032PIPS
                          Midland
                          TX
                          31
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845126
                          56379
                          60633
                          75462
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 33
                          MIDKIFF
      DEAN UTTR33
                          742055190033PIPS
                          Midland
                          TX
                          7
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845127
                          56379
                          60632
                          75463
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDWFF
      DEAN UNIT TR 34
                          MIDKIFF
      DEAN UTTR
      34
                          742055190034PIPS
                          Midland
                          TX
                          16
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845118
                          56379
                          60635
                          75457
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES. USA. INC.
                          MIDKIFF
      DEAN UNIT TR 16
                          MIDKIFF
      DEAN UTTR
      18
                          742055190018PIPS
                          Midland
                          TX
                          20
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          297203
                          63385
                          67972
                          78065
                          0.73567300
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      UNIT
                          MIDKIFF
      UT
                          742055190000PIPS
                          Midland
                          TX
                          492
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          298512
                          56040
                          56040
                          75207
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      R PRESTON SECTION 31
                          PRESTON
      SPRABERRY UT TR 396
                          742055410398PIPS
                          Midland
                          TX
                          20
                          0.60WTI
                          Centurion
      R
                          03/01/2004
                          298115
                          56205
                          56205
                          75203
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      R PRESTON SECTION 41
                          PRESTON
      SPRABERRY UTTR
      42 6
                          74205539042BPIPS
                          Midland
                          TX
                          44
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          200025
                          56210
                          56210
                          75206
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      R PRESTON SECTION 42
                          PRESTON
      SPRABERRY UTTR
      436
                          742055350438PIPS
                          Midland
                          TX
                          31
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          292011
                          56110
                          56110
                          75180
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          PRESTON
      SPRABERRY UNIT TR 41B DTBOWLES
                          PRESTON
      SPRBY UTTR41B
      DTBOWLES
                          742055390418PIPS
                          Midland
                          TX
                          114
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          298114
                          56193
                          56193
                          75202
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      R PRESTON SECTION 32
                          PRESTON,
      SAM R. TR 38B
                          742055380388PIPS
                          Midland
                          TX
                          37
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          298607
                          56045
                          56045
                          75206
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          LOUISE
      SHACKELFORD OIL
                          SHACKELFORD
      COMMINGLE
                          742055170000PIPS
                          Midland
                          TX
                          39
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          295905
                          55586
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 14B
                          SHACKELFORO
      SPRABERRY UT
                          742055420000PIPS
                          Midland
                          TX
                          6
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          251076
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 1
                          SHACKELFORO
      SPRABERRY UTTR
      1
                          742055420001PIPS
                          Midland
                          TX
                          356
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845005
                          55586
                          55586
                          79081
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 13
                          SHACKELFORO
      SPRABERRY UTTR
      13
                          742055420013PIPS
                          Midland
                          TX
                          45
                          060WTI
                          Centurion
      PI
                          03/01/2004
                          545104
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 14
                          SHACKELFORO
      SPRABERRY UT TR 14
                          742055420014PIPS
                          Midland
                          TX
                          26
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645153
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR15
                          SHACKELFORD
      SPRABERRY UT TR15
                          742055420015PIPS
                          Midland
                          TX
                          20
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845167
                          55586
                          55590
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 17C
                          SHACKELFORD
      SPRABERRY UTTR
      17C
                          74205542017CPIPS
                          Midland
                          TX
                          24
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645110
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 18
                          SHACKELFORD
      SPRABERRY UT TR 18
                          742055420018PIPS
                          Midland
                          TX
                          32
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845094
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 24E
                          SHACKELFORO
      SPRABERRY UTTR
      24E
                          74205542024EPIPS
                          Midland
                          TX
                          58
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845248
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES, USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 24F
                          SHACKELFORO
      SPRABERRY UTTR24F
                          74205542024FPIPS
                          Midland
                          TX
                          48
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845152
                          55586
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 28
                          SHACKELFORD
      SPRABERRY UTTR
      28
                          742055420028PIPS
                          Midland
                          TX
                          17
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845271
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 29A
                          SHACKELFORD
      SPRABERRY UTTR
      29
                          742055420029PIPS
                          Midland
                          TX
                          8
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          251073
                          55586
                          55596
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 3
                          SHACKELFORD
      SPRABERRY UTTR
      3
                          742055420003PIPS
                          Midland
                          TX
                          93
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645185
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 30A
                          SHACKELFORD
      SPRABERRY UTTR
      30
                          742056420030PIPS
                          Midland
                          TX
                          11
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645154
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES USA, INC
                          SHACKELFORD
      SPRABERRY UNIT TR 32
                          SHACKELFORD
      SPRABERRY UTTR
      32
                          742055420032PIPS
                          Midland
                          TX
                          31
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845008
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.,
                          SHACKELFORD
      SPRABERRY UNIT TR 33
                          SHACKELFORD
      SPRABERRY UTTR
      33
                          742055420033PIPS
                          Midland
                          TX
                          28
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645158
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 34
                          SHACKELFORO
      SPRABERRY UTTR
      34
                          742055420034PIPS
                          Midland
                          TX
                          21
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645100
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.,
                          SHACKELFORD
      SPRABERRY UNIT TR 35
                          SHACKELFORO
      SPRABERRY UTTR
      35
                          742055420035PIPS
                          Midland
                          TX
                          30
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845630
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 36
                          SHACKELFORO
      SPRABERRY UTTR
      38
                          742055420036PIPS
                          Midland
                          TX
                          56
                          0
      60WTI
                          Centurion
      PI
                          03/01/2004
                          645107
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES, USA, INC
                          SHACKELFORD
      SPRABERRY UNIT TR 42
                          SHACKELFORD
      SPRABERRY UT TR 42
                          742055420O42PIPS
                          Midland
                          TX
                          23
                          060WTI
                          Centurion
      PI
                          03/01/2004
                          645012
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES, USA, INC
                          SHACKELFORD
      SPRABERRY UNIT TR 43
                          SHACKELFORD
      SPRABERRY UTTR
      43
                          742055420043PIPS
                          Midland
                          TX
                          42
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845637
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 44
                          SHACKELFORD
      SPRABERRY UTTR
      44
                          742055420044PIPS
                          Midland
                          TX
                          11
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645636
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 44B
                          SHACKELFORD
      SPRABERRY UTTR
      448
                          74205542044BPIPS
                          Midland
                          TX
                          9
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845639
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC,
                          SHACKELFORD
      SPRABERRY UNIT TR 45
                          SHACKELFORD
      SPRABERRY UTTR45
                          742055420045PIPS
                          Midland
                          TX
                          8
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845640
                          55588
                          55588
                          75091
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES USA, INC
                          SHACKELFORD
      SPRABERRY UNIT TR 46
                          SHACKELFORD
      SPRABERRY UTTR
      46
                          742055420046PIPS
                          Midland
                          TX
                          14
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845655
                          55588
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.,
                          SHACKELFORD
      SPRABERRY UNIT TR 48A
                          SHACKELFORD
      SPRABERRY UTTR
      48A
                          74205542048APIPS
                          Midland
                          TX
                          36
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845215
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 50B
                          SHACKELFORD
      SPRABERRY UTTR
      50B
                          74205542050BPIPS
                          Midland
                          TX
                          49
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845140
                          55586
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 54
                          SHACKELFORD
      SPRABERRY UTTR
      54
                          742055420054PIPS
                          Midland
                          TX
                          11
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645144
                          55588
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 57
                          SHACKELFORO
      SPRABERRY UTTR
      57
                          742055420057PIPS
                          Midland
                          TX
                          12
                          0
      60WTI
                          Centurion
      PI
                          03/01/2004
                          845103
                          55586
                          55588
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 61
                          SHACKELFORD
      SPRABERRY UTTR
      61
                          742055420061PIPS
                          Midland
                          TX
                          55
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645017
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 62
                          SHACKELFORD
      SPRABERRY UTTR
      62
                          742055420062PIPS
                          Midland
                          TX
                          52
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          298651
                          55586
                          55615
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 62B
                          SHACKELFORO
      SPRABERRY LIT TR 626
                          74205542062BPIPS
                          Midland
                          TX
                          32
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645227
                          55566
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 63A
                          SHACKELFORO
      SPRABERRY UT TR 63A
                          74205542063APIPS
                          Midland
                          TX
                          10
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845105
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 64
                          SHACKELFORO
      SPRABERRY UTTR
      64
                          742055420064PIPS
                          Midland
                          TX
                          16
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845106
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORO
      SPRABERRY UNIT TR 65
                          SHACKELFORD
      SPRABERRY UT TR65
                          742055420065PIPS
                          Midland
                          TX
                          23
                          0.60wti
                          Centurion
      PI
                          03/01/2004
                          845222
                          55586
                          55566
                          75091
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES, USA, INC
                          SHACKELFORD
      SPRABERRY UNIT TR 68
                          SHACKELFORD
      SPRABERRY UTTR
      68
                          742055420068PIPS
                          Midland
                          TX
                          29
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          645228
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 70A
                          SHACKELFORD
      SPRABERRY UTTR
      70A
                          74205542070APIPS
                          Midland
                          TX
                          37
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          845281
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 71A
                          SHACKELFORD
      SPRABERRY UTTR
      71A
                          74205542071APIPS
                          Midland
                          TX
                          26
                          0.60WTI
                          Centurion
      PI
                          03/01/2004
                          
                          55594
                          55594
                          75549
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC,
                          SNOW
      DEN A-6
                          SNOW
      DEN A-6
                          742058300000PIPS
                          Midland
                          TX
                          1
                          0.602896
 5
      Greenway Plaza, Suite 110, Houston, Texas 77046-0521Occidental
      Energy Marketing, Inc.
                        
                        P.
      O. Box 27570, Houston, Texas 77227-7570A
      subsidiary of Occidental Petroleum Corporation
                        
                        Phone
      713.215.7000
 
 
 VIA
FAX: 972-969-3574
  TO:
DEB STEWART - PIONEER NATURAL RESOURCES USA, INC. - PHONE
972-969-3855
 FROM:
MARK HAFNER - OCCIDENTAL ENERGY MARKETING, INC. - PHONE
432-685-5884
 
 REFERENCE:
                        OCCIDENTAL
      CONTRACT NUMBER: 0403-PNR-13606-P
 PIONEER
NATURAL RESOURCES USA, INC. CONTRACT NUMBER:
 
 THIS
FAX CONFIRMS THE AGREEMENT BETWEEN DEB STEWART OF PIONEER NATURAL RESOURCES USA,
INC. AND MARK HAFNER OF OCCIDENTAL ENERGY MARKETING, INC. ON FEBRUARY 1, 2004.
THE FOLLOWING DETAILS ARE OCCIDENTAL'S UNDERSTANDING:
 
 SELLER:
                        PIONEER
      NATURAL RESOURCES USA, INC.
("PIONEER")
 BUYER:
                        OCCIDENTAL
      ENERGY MARKETING, INC.
("OCCIDENTAL")
 
 1.
                        VOLUME:APPROXIMATELY 2,912 BARRELS PER DAY EXACT
      VOLUME EQUAL TO THE PRODUCTION FROM THE LEASES ON ATTACHED EXHIBIT
      "A"
 
 2.
                        QUALITY/GRADE:WEST TEXAS
  INTERMEDIATE
 
 3.
                        DELIVERY
      POINT:TITLE
      AND RISK OF LOSS SHALL PASS FROM PIONEER TO OCCIDENTAL AS THE CRUDE OIL
      ENTERS THE FACILITIES OF TROJAN PIPELINE AND TEPPCO PIPELINE AND
      OCCIDENTAL'S DESIGNATED
TRUCKER.
 
 4.
                        TERM:MARCH  1  - 31, 2004 AND
      CONTINUING MONTH TO MONTH THEREAFTER SUBJECT TO A 30 DAY ADVANCE WRITTEN
      NOTICE OF CANCELLATION BY EITHER
PARTY.
 
 5.
                        PRICE:KOCH PETROLEUM GROUP L.P. MONTHLY EDQ POSTED
      PRICE FOR WEST TEXAS/NEW MEXICO INTERMEDIATE DEEMED 40.0 DEGREES FOR THE
      MONTH OF DELIVERY, PLUS THE AVERAGE OF THE *PLATTS DAILY ASSESSMENTS OF
      WTI-P PLUS LESS THE DIFFERENCE BETWEEN (PLATTS WTI-CUSHING LESS PLATTS
      WTI-MIDLAND) PLUS DELTA SET OUT ON EXHIBIT
  "A".
 
 *NOTE ALL
PLATTS PRICING IS FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE
PERIOD BEGINNING ON THE 26TH OF THE SECOND MONTH PRECEEDING THE DELIVERY MONTH
AND ENDING ON THE 25TH OF THE MONTH PRECEEDING THE DELIVERY
MONTH.
 
 6.
                        PAYMENT:      PAYMENT UNDER THIS CONTRACT SHALL BE MADE BY
      WIRE TRANSFER ON THE TWENTIETH (20TH) CALENDAR DAY OF THE MONTH FOLLOWING
      THE MONTH OF DELIVERY LESS APPLICABLE TAXES. IF THE PAYMENT DUE DATE FALLS
      ON A SATURDAY OR BANK HOLIDAY (EXCEPT MONDAY), PAYMENT WILL BE MADE ON THE
      PRECEDING BUSINESS DAY. IF PAYMENT DUE DATE FALLS ON A SUNDAY OR MONDAY
      HOLIDAY, PAYMENT WILL BE MADE ON THE FOLLOWING BUSINESS DAY. PAYMENT
      SHOULD BE MADE TO BANK OF AMERICA, FOR THE ACCOUNT OF PIONEER NATURAL
      RESOURCES USA, INC., ACCOUNT NO. XXXXXXXXXX, ABA NO.
      XXXXXXXXX.
  7.
                        COMMENTS
      AND SPECIAL PROVISIONS:CONOCO'S GENERAL TERMS AND CONDITIONS TO
      APPLY.
 
 APPROVED BY:
                          
                          /s/ John
      T. McWhorterJOHN T. MCWHORTEROCCIDENTAL ENERGY MARKETING, INC.APPROVED BY:
                          
                          /s/ Hershal K. WolfePIONEER
      NATURAL RESOURCES USA, INC.
                          Hershal
      K. WolfeDirector of
      Marketing
  EXHIBIT
"A"
 OEMI'S
Contract #0403-PNR-13606-P
 Contracts
#
 Allegro
Contract #114660
  Crude
      Type
                          Transporter
                          Start
      Date
                          Carrier
      Lease ID*
                          EMOC
      RC
                          RPC
                          DO
                          Decimal
                          Old
      XOM Contract #
                          Operator
                          Lease
      Name
                          OXY
      ALLEOO LEASE NAME
                          OXY
      Lease #
                          County
                          State
                          BVD
                          Lease
      DeltaWTI
                          Genesis
      Trks
                          03/01/2004
                          57043
                          56154
                          56154
                          75195
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          ARTHUR
      JUDKINS A
                          ARTHUR
      JUDKINS A
                          74205472A000PITS
                          Midland
                          TX
                          7
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          53261
                          58525
                          59525
                          76928
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          CARLETON
      B
                          CARLETON
      B
                          742054790000PITS
                          Upton
                          TX
                          4
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57041
                          56151
                          58151
                          75194
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          CARLISS
      JUDKINS
                          CARLISS
      JUDKINS
                          742054800000PITS
                          Midland
                          TX
                          16
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57050
                          56129
                          56129
                          75184
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          E E
      EILAND B
                          E E
      EILAND B
                          742054950000PITS
                          Midland
                          TX
                          4
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          50703
                          55584
                          68208
                          75088
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA
      DEAN TR 1
                          GERMANIA
      TRACT 1
                          742054990001PITS
                          Midland
                          TX
                          132
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          58537
                          55584
                          68208
                          75068
                          044733000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA
      UNIT TR 113
                          GERMANIA
      UT TR 113
                          742055000000PITS
                          Midland
                          TX
                          95
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67195
                          78066
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UT TR 1
                          GERMANIA
      UT TR 113
                          742055000000PITS
                          Midland
                          TX
                          35
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          57222
                          79067
                          0.13455600
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UT TR 2
                          GERMANIA
      UT TR 113
                          742055000000PITS
                          Midland
                          TX
                          10
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67223
                          78068
                          0.23009200
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UT TR 3
                          GERMANIA
      UT TR113
                          742055000000PITS
                          Midland
                          TX
                          18
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          87225
                          78069
                          0
      12876100
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRA8ERRY
      UT TR 4
                          GERMANIA
      UT TR113
                          742055000000PITS
                          Midland
                          TX
                          10
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67227
                          78070
                          0
      03764500
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMANIA-SPRABERRY
      UT TR 5
                          GERMANIA
      UT TR 113
                          742055000000PITS
                          Midland
                          TX
                          3
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57045
                          63359
                          67228
                          79071
                          002161600
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          GERMAN
      IA-SPRA8ERRY UT TR 6
                          GERMANIA
      UT TR 113
                          742055000000
      PITS
                          Midland
                          TX
                          1
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57671
                          55636
                          55636
                          75729
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          JOHN
      SNOWDEN
                          JOHN
      SNOWDEN
                          742055110000PITS
                          Midland
                          TX
                          9
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          50499
                          56033
                          56033
                          75148
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          JUDKINS
      H 1, 2
                          JUDKINS
      H 1,2
                          742055130000
      PITS
                          Midland
                          TX
                          11
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          53259
                          59466
                          61707
                          76895E
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MOBIL
      NEAL 34
                          MOBIL
      NEAL 34
                          742055210000PITS
                          Upton
                          TX
                          4
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          
                          52571
                          52571
                          73911
                          1.00000000
                          E006D
                          PIONEER
      NATURAL RES. USA, INC.
                          MAILT
                          NAIL t
                          742055250000PITS
                          Martin
                          TX
                          4
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          53260
                          59466
                          81709
                          76895F
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          NEAL
      34
                          NEAL
      34
                          742055260000PTTS
                          Upton
                          TX
                          1
                          -0
      60WTI
                          Genesis
      Trks
                          03/01/2004
                          57044
                          56378
                          56378
                          75455
                          1
      00000000
                          B0080
                          PIONEER
      NATURAL RES. USA, INC.
                          0-DANIEL
      COMMINGLED
                          OOAMIEL
      COMMINGLED
                          742055330000PITS
                          Midland
                          TX
                          96
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57670
                          56102
                          56102
                          75178
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SNOW
      DEN A 1-5
                          SNOW
      DEN A 1-5
                          742055450000PITS
                          Midland
                          TX
                          42
                          -0.60WTI
                          Genesis
      Trks
                          03/01/2004
                          57051
                          76253
                          76253
                          52840
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          WALTON
      JUDKINS B
                          WALTON
      JUDKINS B
                          742055550000PITS
                          Midland
                          TX
                          3
                          -0.60WTI
                          TEPPCO
      PI
                          03/01/2004
                          
                          56063
                          56063
                          75161
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          D L
      HUTT SEC 26
                          D L
      HUTT SEC 26
                          742054860000PIPS
                          Midland
                          TX
                          17
                          -0
      60WTI
                          TEPPCO
      PI
                          03/01/2004
                          
                          81387
                          81387
                          75182
                          1
      00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          D L
      HUTT SEC 28
                          D L
      HUTT SEC 28
                          742054670000PIPS
                          Midland
                          TX
                          7
                          -0
      60WTI
                          TEPPCO
      PI
                          03/01/2004
                          
                          56147
                          56147
                          75192
                          100000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          JADEE
                          JADEE
                          742055100000PIPS
                          Midland
                          TX
                          5
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          295904
                          56146
                          56148
                          75193
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          ARTHUR
      JUDKINS
                          ARTHUR
      JUDKINS
                          742054720000PIPS
                          Midland
                          TX
                          17
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          294202
                          26329
                          26329
                          75189
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          BESSIE
      FREEMAN
                          BESSIE
      FREEMAN
                          742054730000PIPS
                          Midland
                          TX
                          8
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          251029
                          2S496
                          29496
                          75042
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          FREEMAN
      A
                          FREEMAN
      A
                          742054980000PIPS
                          Midland
                          TX
                          19
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845114
                          56379
                          60637
                          75458
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 17
                          MIDKIFF
      DEAN UT TR 17
                          742055190017PIPS
                          Midland
                          TX
                          18
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          B45102
                          56379
                          60631
                          75467
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKJFF
      DEAN UNIT TR 23
                          MIDKIFF
      DEAN UT TR 23
                          742055190023PIPS
                          Midland
                          TX
                          19
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845131
                          56379
                          60636
                          75460
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 24
                          MIDKIFF
      DEAN UT TR 24
                          742055190024PIPS
                          Midland
                          TX
                          19
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845101
                          56379
                          60630
                          75466
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 25
                          MIDKIFF
      DEAN UT TR 25
                          742055190025PIPS
                          Midland
                          TX
                          19
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845112
                          56379
                          60634
                          75461
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 32
                          MIDKIFF
      DEAN UT TR 32
                          742055190032PIPS
                          Midland
                          TX
                          31
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845126
                          56379
                          60633
                          75462
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 33
                          MIDKIFF
      DEAN UT TR 33
                          742055190033PIPS
                          Midland
                          TX
                          7
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845127
                          56379
                          60632
                          75463
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 34
                          MIDKIFF
      DEAN UT TR 34
                          742055190034PIPS
                          Midland
                          TX
                          16
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845118
                          56379
                          60635
                          75457
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      DEAN UNIT TR 18
                          MIDKIFF
      DEAN UT TR 18
                          742055190018P1PS
                          Midland
                          TX
                          20
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          297203
                          63385
                          67972
                          78065
                          0.73567300
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          MIDKIFF
      UNIT
                          MIDKIFF
      UT
                          742055190000PIPS
                          Midland
                          TX
                          492
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          298512
                          56040
                          56040
                          75207
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA. IMC.
                          SAM
      rPRESTON SECTION 31
                          PRESTON
      SPRABERRY UT TR 386
                          74205541039BPIPS
                          Midland
                          TX
                          20
                          -0.60WTI
                          Trojan
      R
                          03/01/2004
                          298115
                          56205
                          56205
                          75203
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      rPRESTON SECTION 41
                          PRESTON
      SPRABERRY UT TR 42 B
                          74205539042BPIPS
                          Midland
                          TX
                          44
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          200025
                          56210
                          56210
                          75206
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      rPRESTON SECTION 42
                          PRESTON
      SPRABERRY UT TR 43B
                          74205535043BPIPS
                          Midland
                          TX
                          31
                          -0.60WTI
                          Trojan
      R
                          03/01/2004
                          292011
                          56110
                          56110
                          75180
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          PRESTON
      SPRABERRY UNIT TR41B DT BOWLES
                          PRESTON
      SPRBY UT TR41B.DT BOWLES
                          74205539041BPIPS
                          Midland
                          TX
                          114
                          -0.60WTI
                          Trojan
      R
                          03/01/2004
                          298114
                          56193
                          56193
                          75202
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SAM
      rPRESTON SECTION 32
                          PRESTON,
      SAM R. TR 388
                          74205538038BPIPS
                          Midland
                          TX
                          37
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          298607
                          56045
                          56045
                          75208
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          LOUISE
      SHACKELFORD OIL
                          SHACKELFORD
      COMMINGLE
                          742055170000PIPS
                          Midland
                          TX
                          39
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          295905
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.,
                          SHACKELFORD
      SPRABERRY UNIT TR 14B
                          SHACKELFORD
      SPRABERRY UT
                          742055420000PIPS
                          Midland
                          TX
                          6
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          251076
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          RONEER
      NATURAL RES. USA. INC
                          SHACKELFORD
      SPRABERRY UNIT TR 1
                          SHACKELFORD
      SPRABERRY UT TR 1
                          742055420001PIPS
                          Midland
                          TX
                          356
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845005
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 13
                          SHACKELFORD
      SPRABERRY UT TR 13
                          742055420013PIPS
                          Midland
                          TX
                          45
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845104
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 14
                          SHACKELFORD
      SPRABERRY UT TR 14
                          742055420014PIPS
                          Midland
                          TX
                          26
                          -0.60WTI
                          Trojan
      R
                          03/01/2004
                          845153
                          55586
                          55596
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 15
                          SHACKELFORD
      SPRABERRY UT TR 15
                          742055420015PIPS
                          Midland
                          TX
                          20
                          -0.60WTI
                          Trojan
      R
                          03/01/2004
                          845167
                          55586
                          55590
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 17C
                          SHACKELFORD
      SPRABERRY UT TR 17C
                          74205542017CPIPS
                          Midland
                          TX
                          24
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845110
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 18
                          SHACKELFORD
      SPRABERRY UT TR 18
                          742055420018PIPS
                          Midland
                          TX
                          32
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845094
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 24E
                          SHACKELFORD
      SPRABERRY UT TR 24E
                          74205542024EPIPS
                          Midland
                          TX
                          58
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845248
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 24F
                          SHACKELFORD
      SPRABERRY UT TR 24F
                          74205542024FPIPS
                          Midland
                          TX
                          48
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          B45152
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 28
                          SHACKELFORD
      SPRABERRY UT TR 28
                          742055420028PIPS
                          Midland
                          TX
                          17
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845271
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 29A
                          SHACKELFORD
      SPRABERRY UT TR 29
                          742055420029PIPS
                          Midland
                          TX
                          8
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          251073
                          55586
                          55596
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 3
                          SHACKELFORD
      SPRABERRY UT TR 3
                          742055420003PIPS
                          Midland
                          TX
                          93
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          645185
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 30A
                          SHACKELFORD
      SPRABERRY UT TR 30
                          742055420030PIPS
                          Midland
                          TX
                          11
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845154
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 32
                          SHACKELFORD
      SPRABERRY UT TR 32
                          742055420032PIPS
                          Midland
                          TX
                          31
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845008
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 33
                          SHACKELFORD
      SPRABERRY UT TR 33
                          742055420033PIPS
                          Midland
                          TX
                          28
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845158
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 34
                          SHACKELFORD
      SPRABERRY UT TR 34
                          742055420034PIPS
                          Midland
                          TX
                          21
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845100
                          55586
                          55586
                          75091
                          1.00000000
                          B008O
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 35
                          SHACKELFORD
      SPRABERRY UT TR35
                          742055420035PIPS
                          Midland
                          TX
                          30
                          -0
      60WTI
                          Trojan
      PI
                          03/01/2004
                          845630
                          55596
                          55586
                          75091
                          1.00000000
                          B006O
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 36
                          SHACKELFORD
      SPRABERRY UT TR 36
                          742055420036PIPS
                          Midland
                          TX
                          58
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845107
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 42
                          SHACKELFORD
      SPRABERRY UT TR 42
                          742055420042PIPS
                          Midland
                          TX
                          23
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845012
                          55586
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 43
                          SHACKELFORD
      SPRABERRY UT TR43
                          742055420043PIPS
                          Midland
                          TX
                          42
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845637
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 44
                          SHACKELFORD
      SPRABERRY UT TR 44
                          742055420044
      PIPS
                          Midland
                          TX
                          11
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845638
                          55586
                          55566
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR44B
                          SHACKELFORD
      SPRABERRY UT TR 44B
                          74205542044BPIPS
                          Midland
                          TX
                          9
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845639
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 45
                          SHACKELFORD
      SPRABERRY UT TR 45
                          742055420045PIPS
                          Midland
                          TX
                          8
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845640
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 46
                          SHACKELFORD
      SPRABERRY UT TR 46
                          742055420046PIPS
                          Midland
                          TX
                          14
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845655
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 48A
                          SHACKELFORD
      SPRABERRY UT TR 48A
                          74205542048APIPS
                          Midland
                          TX
                          36
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845215
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 50B
                          SHACKELFORD
      SPRABERRY UT TR 50B
                          74205542050BPIPS
                          Midland
                          TX
                          49
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845140
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 54
                          SHACKELFORD
      SPRABERRY UT TR 54
                          742055420054PIPS
                          Midland
                          TX
                          11
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845144
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 57
                          SHACKELFORD
      SPRABERRY UT TR 57
                          742055420057PIPS
                          Midland
                          TX
                          12
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845103
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 61
                          SHACKELFORD
      SPRABERRY UT TR 61
                          742055420061PIPS
                          Midland
                          TX
                          55
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845017
                          55596
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 62
                          SHACKELFORD
      SPRABERRY UT TR 62
                          742055420062PIPS
                          Midland
                          TX
                          52
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          298651
                          55586
                          55615
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 62B
                          SHACKELFORD
      SPRABERRY UT TR 62B
                          74205542062BPIPS
                          Midland
                          TX
                          32
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845227
                          55566
                          55596
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 63A
                          SHACKELFORD
      SPRABERRY UT TR 63A
                          74205542063APIPS
                          Midland
                          TX
                          10
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845105
                          55566
                          55586
                          75091
                          1.00000000
                          8008O
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 64
                          SHACKELFORD
      SPRABERRY UT TR64
                          742055420064PIPS
                          Midland
                          TX
                          16
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845106
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 65
                          SHACKELFORD
      SPRABERRY UT TR 65
                          742055420065PIPS
                          Midland
                          TX
                          23
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845222
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR 6S
                          SHACKELFORD
      SPRABERRY UT TR 6B
                          74205542006BPIPS
                          Midland
                          TX
                          29
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          845228
                          55586
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR70A
                          SHACKELFORD
      SPRABERRY UTTR70A
                          74205542070APIPS
                          Midland
                          TX
                          37
                          -0.60WTI
                          Trepan
      PI
                          03/01/2004
                          8452S1
                          55566
                          55586
                          75091
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SHACKELFORD
      SPRABERRY UNIT TR71A
                          SHACKELFORD
      SPRABERRY UT TR 71A
                          74205542071APIPS
                          Midland
                          TX
                          26
                          -0.60WTI
                          Trojan
      PI
                          03/01/2004
                          
                          55594
                          55594
                          75549
                          1.00000000
                          B008D
                          PIONEER
      NATURAL RES. USA, INC.
                          SNOWDENA-6
                          SNOW
      DEN A-6
                          742058300000PIPS
                          Midland
                          TX
                          1
                          -0.602912
  
  Occidental
      Energy Marketing, Inc.
                      5
      Greenway Plaza, Suite 110, Houston, Texas 77046-0521A
      subsidiary of Occidental Petroleum Corporation
                      P.
      O. Box 27570, Houston, Texas 77227-7570Phone
      713.215.7000
 
 
 CRUDE
OIL CONTRACT AMENDMENT No. 5
 
 VIA
FAX:
 
 TO:
                      Pioneer
      Natural Resources USA, Inc.
 Attn:
      Contract Management Services
 Fax:
      (972)969-3574
 Trader:
      Deb Stewart
 
 FROM:
                      Occidental
      Energy Marketing, Inc.
 Trader:
      Mark Hafner
 
 RE:
                      Occidental
      Contract # 0403-PNR-13604-P
                      Amendment
      #5
 
 This
Amendment Number 5 to the Crude Oil Contract between Occidental Energy
Marketing, Inc. ("OEMI") and Pioneer Natural Resources USA, Inc.
("Counterparty") dated March, 2004 (the "Contract") is entered into as of
September 18, 2008.
 
 For good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged and agreed, the Parties agree that the Contract is hereby amended
effective September 1, 2008 as set forth below.
 
 Add
the following leases to the contract and Exhibit "A":
 
 Lease
Name
 W.H.
Wilde
 
 
 All other
terms of the agreement are unchanged.
 
 
 Agreed to
and approved by:
 OEMI
 
  /s/
      Mark HafnerMark
      HafnerDirector,
      Crude Oil Acquisitions
  Agreed to
and approved by:
 Pioneer
Natural Resources USA, Inc.
 
 
 /s/
      Hershal K. WolfeHershal
      K. WolfeVice
      President Marketing
  
  EXHIBIT
"A"
 
 OEMI's
CONTRACT: 0403-PNR-13604-P#5
 Counter
Party Name:    Pioneer Natural Resources
 Counter
Party Contract Number: OII-10444
 Allegro
Contract Number:    119314
 
 INTERFACE
                      
                      PRODUCT
                      
                      OPERATOR
                      
                      LEASE
      NAME
                      
                      LEASE
      EFFECTIVE DATE
                      
                      CONTROLLED
      %
                      
                      COUNTY
                      
                      STATE
                      
                      TRANSPORTER
                      
                      DELTA
                      
                      DELTA
      EFFECTIVE DATE
                      
                      CONTRACT
                      
                      PRICE
      INDEX742054710000PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      ALLEEN
      OBRIEN 6, 43, BK BOONE
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.30
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet742054820000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      COX
      B
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742054830000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      CUNNINGHAM
      16
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742054840000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      CUNNINGHAM
      16-A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742054850000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      CUNNINGHAM
      B
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742065260000PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      Davison
      #2
                      
                      2/1/2006
                      
                      100.00000000
                      
                      UPTON
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.30
                      
                      7/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet742055040000PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      H L
      MCCLINTE
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.30
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205530001APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 1 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205530019APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 19 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205530020APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 20A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74206530021APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 21A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530022APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 22A
                      
                      5/1/2005
                      
                      100
      00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530002APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 2A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055300039PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 39
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530039APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 39 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205530003APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 3A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530040APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 40A
                      
                      5/1/2005
                      
                      100
      00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530042APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 42A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530043APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 43A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet7420653045APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 45A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530048APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 48A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055300052PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 5-2
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet742055300054PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 5-4
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet742055300542PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 5-42
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205530051APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 51A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530052APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 52A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205630053APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 53A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530068APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 68A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530069APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 69A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530006APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 6A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530070APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 70A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530071APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 71A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530007APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 7A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530085APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 85A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530086APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 86A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205530088APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 88A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530069APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 89A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205530090APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRABERRY UT TR 90A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055240000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      N.
      PEMBROOK SPRBY UT TR 6/67/85
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742058290000PITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      OBRIEN
      A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.30
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet742055430000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SHERROO
      44
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Upton
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055460000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPBY
      ORIVER-PION PL
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547101
      APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      OR VER UT TR 101A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547102APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 102A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547105APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UTTR 105A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547011APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 11A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547012APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 12A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547130APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 130A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547131APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 131A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      6/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055470014PIPS
                      
                      WTI
                      
                      Pioneer
      Nature! Resources
                      
                      SPRABERRY
      DRIVER UT TR 14
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547151APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 151A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547152APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 152A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547153APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 153A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547154APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 154A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      6/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547160APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DR VER UT TR 160A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547161APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UTTR 161 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547162APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 162 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547163APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 163 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet742055470017PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 17
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      6/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547017APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 17A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547185APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 185A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547167APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 187A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055471SSAPIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 188A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547169APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 169A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547018APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 18A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547190APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 190A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547191APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 191A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547192APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 192A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547193APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 193A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547194APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 194A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      6/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547195APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 195A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205647199APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 199 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547200APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 200 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2008
                      
                      119314
                      
                      XP
      - Midland Sweet74205547201APITS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 201 A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      OET
      Trucks
                      
                      $0.60
                      
                      3/1/2006
                      
                      119314
                      
                      XP
      - Midland Sweet74205547214APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UTTR 214A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      6/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547215APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 215A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet  
  74205547220APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 220A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547221APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 221A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547222APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 222A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547226APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 226A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742065470229PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 229
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547230APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 230A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74206547232APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 232A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547047APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 47A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055470062PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 62
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547062APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 62A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Glasscock
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547067APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 67A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742054660MULPIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR 72
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $030
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet74205547104APIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT TR104A
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055470001PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT-1
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055470002PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT-2
                      
                      5/1/2005
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055470003PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT-3
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Reagan
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0.30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055470004PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      SPRABERRY
      DRIVER UT-4
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742O64740000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      TANK
      FARM BATTERY
                      
                      11/1/2005
                      
                      100.00000000
                      
                      MIDLAND
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      ($0.00)
                      
                      11/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742055510000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      TIPPETT
      D
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centunon
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet742089600000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      W
      H.WILDE
                      
                      9/1/2008
                      
                      100.00000000
                      
                      REAGAN
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      9/1/2008
                      
                      119314
                      
                      XP
      - Midland Sweet742055630000PIPS
                      
                      WTI
                      
                      Pioneer
      Natural Resources
                      
                      WINDHAM
      J
                      
                      5/1/2005
                      
                      100.00000000
                      
                      Midland
                      
                      TX
                      
                      Centurion
      Pipeline
                      
                      $0
      30
                      
                      5/1/2005
                      
                      119314
                      
                      XP
      - Midland Sweet
 5
      Greenway Plaza, Suite 110, Houston, Texas 77046-0521Occidental
      Energy Marketing, Inc.
                    
                    P.O.
      Box 27570,Houston,
      Texas77227-7570A
      subsidiary of Occidental Petroleum
      Corporation
                    
                    Phone
      713.215.7000
 
 VIA FAX:
972-969-3574
 
 TO:
                  DEB
      STEWART - PIONEER NATURAL RESOURCES USA, INC. - PHONE
      972-969-3855
 FROM:
                  MARK
      HAFNER- OCCIDENTAL ENERGY MARKETING, INC. - PHONE
    432-685-5884
 
 REFERENCE:
                  OCCIDENTAL
      CONTRACT NUMBER: 0403-PNR-13604-P
 PIONEER
      NATURAL RESOURCES USA, INC. CONTRACT
NUMBER:
 
 THIS FAX
CONFIRMS THE AGREEMENT BETWEEN DEB STEWART OF PIONEER NATURAL RESOURCES USA,
INC. AND MARK HAFNER OF OCCIDENTAL ENERGY MARKETING, INC. ON FEBRUARY 1, 2004.
THE FOLLOWING DETAILS ARE OCCIDENTAL'S UNDERSTANDING:
 
 SELLER:
                  PIONEER
      NATURAL RESOURCES USA, INC.
("PIONEER")
 BUYER:
                  OCCIDENTAL
      ENERGY MARKETING, INC.
("OCCIDENTAL")
  1.
                    VOLUME:     
      APPROXIMATELY 2,760 BARRELS PER DAY EXACT VOLUME EQUAL TO THE PRODUCTION
      FROM THE LEASES ON ATTACHED EXHIBIT
"A"
 
 2.
                    QUALITY/GRADE:    
      WEST TEXAS INTERMEDIATE
 
 3.
                    DELIVERY
      POINT:     TITLE AND RISK OF LOSS SHALL PASS
      FROM PIONEER TO OCCIDENTAL AS THE CRUDE OIL ENTERS THE FACILITIES OF
      TROJAN PIPELINE AND OCCIDENTAL'S DESIGNATED
  TRUCKER.
 
 4.
                    TERM:MARCH 1 - 31, 2004 AND CONTINUING MONTH TO MONTH THEREAFTER SUBJECT
      TO A 30 DAY ADVANCE WRITTEN NOTICE OF CANCELLATION BY EITHER
      PARTY.
  5.
                    PRICE:PRICE: OXY AGREES TO PAY PIONEER A PRICE PER BARREL EQUAL TO ONE OF
      THE THREE PRICING FORMULAS DESCRIBED BELOW. PIONEER SHALL HAVE THE RIGHT
      TO ELECT WHICH PRICING FORMULA IS USED ON A QUARTERLY BASIS. PIONEER SHALL
      NOTIFY OXY IN WRITING AT LEAST FIVE (5) DAYS PRIOR TO THE BEGINNING OF THE
      FIRST NYMEX TRADING MONTH OF ANY QUARTER. THE QUARTERLY PRICING FORMULA
      WILL DEFAULT TO THE PRECEDING QUARTER'S PRICING FORMULA IF PIONEER
      NEGLECTS TO NOTIFY OXY BY FIVE (5) DAYS PRIOR TO THE BEGINNING OF THE
      NYMEX TRADING MONTH FOR ANY GIYEN
QUARTER.
 IT IS
HEREBY AGREED THAT PRICING FORMULA 3 WILL BE USED FOR MARCH 2004 AND WILL BE
USED FOR THE REMAINDER OF THE SECOND QUARTER OF 2004.
 
 FORMULA 1
- PLATT'S TRADING MONTH POSTING PLUS (MIDLAND)
 
 PRICE: KOCH PETROLEUM GROUP
L.P. MONTHLY EDQ POSTED PRICE FOR WEST TEXAS/NEW MEXICO INTERMEDIATE DEEMED 40.0
DEGREES FOR THE MONTH OF DELIVERY, PLUS THE AVERAGE OF THE *PLATTS DAILY
ASSESSMENTS OF WTI-P PLUS LESS THE DIFFERENCE BETWEEN (PLATTS WTI-CUSHING LESS
PLATTS WTI-MIDLAND) PLUS THE DELTA DOLLARS PER BARREL SET OUT ON EXHIBIT
"A".
 
 * NOTE
ALL PLATTS PRICING IS FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE
PERIOD BEGINNING ON THE 26TH OF
THE SECOND MONTH PROCEEDING THE DELIVERY MONTH AND ENDING ON THE 25TH OF
THE MONTH PRECEEDING THE DELIVERY MONTH (CARRIED TO 4 DECIMAL
PLACES).
  
  FORMULA 2
- PLATT'S TRADING MONTH WT (MIDLAND)
 
 THE
AVERAGE OF THE MIDPOINTS OF THE ASSESSMENTS FOR PLATT'S TRADING MONTH WTI AT
MIDLAND, THE PLATT'S TRADING MIDLAND WTI VALUE SHALL BE THE MEAN DAILY AVERAGE,
AS PUBLISHED BY PLATTS DURING THE PERIOD BEGINNING ON THE 26th OF THE SECOND
MONTH PROCEEDING THE DELIVERY MONTH AND ENDING ON THE 25th OF THE MONTH
PRECEEDING THE DELIVERY MONTH (CARRIED TO 4 DECIMAL PLACES), PLUS THE DELTA
DOLLARS PER BARREL SET OUT ON EXHIBIT "A".
 
 FORMULA 3
- NYMEX TRADING MONTH DOMESTIC LIGHT SWEET (MIDLAND)
 
 THE
AVERAGE OF THE DAILY NYMEX SETTLEMENT PRICE FOR THE NEAR MONTH LIGHT SWEET CRUDE
OIL CONTRACT FOR THE PERIOD THAT THE DELIVERY MONTH TRADES AS THE PROMPT MONTH
(I.E. NYMEX TRADING MONTH), LESS THE DIFFERENCE BETWEEN (PLATTS WTI-CUSHING LESS
PLATTS WTI-MIDLAND) PLUS THE DELTA DOLLARS PER BARREL SET OUT ON EXHIBIT
"A".
 
 * NOTE ALL PLATTS PRICING IS
FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE PERIOD BEGINNING ON THE
26th OF THE SECOND MONTH PROCEEDING THE DELIVERY MONTH AND ENDING ON THE 25th OF
THE MONTH PRECEEDING THE DELIVERY MONTH (CARRIED TO 4 DECIMAL
PLACES).
 
 6.
                      PAYMENT: PAYMENT UNDER
      THIS CONTRACT SHALL BE MADE BY WIRE TRANSFER ON THE TWENTIETH (20�)
      CALENDAR DAY OF THE MONTH FOLLOWING THE MONTH OF DELIVERY LESS APPLICABLE
      TAXES. IF THE PAYMENT DUE DATE FALLS ON A SATURDAY OR BANK HOLIDAY (EXCEPT
      MONDAY), PAYMENT WILL BE MADE ON THE PRECEDING BUSINESS DAY. IF PAYMENT
      DUE DATE FALLS ON A SUNDAY OR MONDAY HOLIDAY, PAYMENT WILL BE MADE ON THE
      FOLLOWING BUSINESS DAY. PAYMENT SHOULD BE MADE TO BANK OF AMERICA, FOR THE
      ACCOUNT OF PIONEER NATURAL RESOURCES USA, INC., ACCOUNT NO. 1290159897,
      ABA NO. 111000012.
 
 7.
                      COMMENTS AND SPECIAL
      PROVISIONS: CONOCO'S GENERAL TERMS AND CONDITIONS TO
      APPLY.
 
 APPROVED
      BY:
                      /S/ JOHN T. MCWHORTERJOHN
      T. MCWHORTEROCCIDENTAL
      ENERGY MARKETING, INC.APPROVED
      BY:
                      /S/ HERSHAL K. WOLFEPIONEER
      NATURAL RESOURCES USA, INC.HERSHAL
      K. WOLFEDIRECTOR
      - MARKETING
  
  EXHIBIT
"A"
 
 OEMI'S
Contract #0403-PNR-13604-P
 Contract
#
 Allegro
Contract #114666
 
 Crude
      Type
                      
                      Transporter
                      
                      Start
      Date
                      
                      Carrrier
                        Lease
      ID
                        #
                      
                      EMOC
                        RC
                      
                      RPC
                      
                      DO
                      
                      Decimal
                      
                      Old
      XOM
                        Contract
      #
                      
                      Operator
                      
                      Lease
      Name
                      
                      ALLEGO
      LEASE NAME
                      
                      OXY
      Lease #
                      
                      County
                      
                      State
                      
                      B/D
                      
                      Lease
                        DeltaWTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      51455
                      
                      56107
                      
                      56107
                      
                      75179
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      ALLEEN
      O'BRIEN 6, 43, BK BOONE
                      
                      ALLEEN
      OBRIEN 6,43, BK BOONE
                      
                      742054710000PITS
                      
                      Midland
                      
                      TX
                      
                      53
                      
                      -0.30WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      51457
                      
                      55916
                      
                      55916
                      
                      75026
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      H L
      MCCLINTE
                      
                      H L
      MCCLINTE
                      
                      742055040000PITS
                      
                      Midland
                      
                      TX
                      
                      56
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      57251
                      
                      55598
                      
                      55598
                      
                      75564
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 1 A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 1 A
                      
                      74205530001APITS
                      
                      Upton
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      57027
                      
                      55598
                      
                      68286
                      
                      75564
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UN IT TR 19 A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 19 A
                      
                      7420553001SAPITS
                      
                      Upton
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      57040
                      
                      55598
                      
                      76621
                      
                      75551
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 39
                      
                      N.
      PEMBROOK SPRABERRY UT TR 39
                      
                      742055300039PITS
                      
                      Upton
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      52782
                      
                      55598
                      
                      68286
                      
                      75564
                      
                      1.00000000
                      
                      BOH
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR39 A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 39 A
                      
                      74205530039APITS
                      
                      Upton
                      
                      TX
                      
                      66
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      57248
                      
                      55598
                      
                      55598
                      
                      75564
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 5-2
                      
                      N.
      PEMBROOK SPRABERRY UT TR 5-2
                      
                      742055300052PITS
                      
                      Upton
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      57249
                      
                      55598
                      
                      55598
                      
                      75564
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 5-4
                      
                      N.
      PEMBROOK SPRABERRY UT TR 5-4
                      
                      742055300054PITS
                      
                      Upton
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      57250
                      
                      55598
                      
                      55598
                      
                      75564
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 5-42
                      
                      N.
      PEMBROOK SPRABERRY UT TR 5-42
                      
                      742055300542PITS
                      
                      Upton
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      51456
                      
                      56107
                      
                      56107
                      
                      75179
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      ALLEEN
      OBREN 6, 43, BK BOONE
                      
                      OBRIEN
      A
                      
                      742058290000PITS
                      
                      Midland
                      
                      TX
                      
                      53
                      
                      -0.30WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      53001
                      
                      55671
                      
                      74595
                      
                      74654
                      
                      0.96217683
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 161 A
                      
                      SPRABERRY
      DRIVER UT TR 161 A
                      
                      74205547161APITS
                      
                      Reagan
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      53079
                      
                      55671
                      
                      74575
                      
                      74654
                      
                      0.96217683
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 162 A
                      
                      SPRABERRY
      DRIVER UT TR 162 A
                      
                      74205547162APITS
                      
                      Reagan
                      
                      TX
                      
                      68
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      53088
                      
                      55671
                      
                      74575
                      
                      74654
                      
                      0.96217683
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 163 A
                      
                      SPRABERRY
      DRIVER UT TR 163 A
                      
                      74205547163APITS
                      
                      Reagan
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      53113
                      
                      55671
                      
                      76570
                      
                      74655
                      
                      0.96217683
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 199 A
                      
                      SPRABERRY
      DRIVER UT TR 199 A
                      
                      74205547199APITS
                      
                      Reagan
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      52988
                      
                      55671
                      
                      76570
                      
                      74655
                      
                      0.96217683
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 200 A
                      
                      SPRABERRY
      DRIVER UT TR 200 A
                      
                      74205547200APITS
                      
                      Reagan
                      
                      TX
                      
                      60
                      
                      -0.60WTI
                      
                      Genesis
      Trks
                      
                      03/01/2004
                      
                      53006
                      
                      55671
                      
                      76570
                      
                      74655
                      
                      0.96217683
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 201 A
                      
                      SPRABERRY
      DRIVER UT TR 201 A
                      
                      74205547201APITS
                      
                      Reagan
                      
                      TX
                      
                      1
                      
                      -0.60WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845807
                      
                      55939
                      
                      55939
                      
                      75593
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      COX
      B
                      
                      COX
      B
                      
                      742054820000PIPS
                      
                      Glasscock
                      
                      TX
                      
                      1
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845587
                      
                      55933
                      
                      55933
                      
                      75540
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      CUNNINGHAM
      16
                      
                      CUNNINGHAM
      16
                      
                      742054830000PIPS
                      
                      Midland
                      
                      TX
                      
                      2
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845588
                      
                      55936
                      
                      55936
                      
                      75541
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      CUNNINGHAM
      16-A
                      
                      CUNNINGHAM
      16-A
                      
                      742054S40000PIPS
                      
                      Midland
                      
                      TX
                      
                      8
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845642
                      
                      55591
                      
                      55591
                      
                      75546
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      CUNNINGHAM
      B
                      
                      CUNNINGHAM
      B
                      
                      742054850000PIPS
                      
                      Midland
                      
                      TX
                      
                      26
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845672
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR21A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 21A
                      
                      74205530021APPS
                      
                      Upton
                      
                      TX
                      
                      119
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845684
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR86A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 86A
                      
                      74205530086APIPS
                      
                      Upton
                      
                      TX
                      
                      14
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845691
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR88A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 88A
                      
                      74205530088APIPS
                      
                      Upton
                      
                      TX
                      
                      11
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845671
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 20A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 20A
                      
                      74205530020APIPS
                      
                      Upton
                      
                      TX
                      
                      41
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845673
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 22A
                      
                      N.
      PEMBROOK SPRABERRY UTTR22A
                      
                      74205530022APIPS
                      
                      Upton
                      
                      TX
                      
                      70
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845675
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 2A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 2A
                      
                      74205530002APIPS
                      
                      Upton
                      
                      TX
                      
                      14
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845676
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 3A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 3A
                      
                      74205530003APIPS
                      
                      Upton
                      
                      TX
                      
                      47
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845688
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 40A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 40A
                      
                      74205530040APIPS
                      
                      Upton
                      
                      TX
                      
                      32
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845689
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 42A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 42A
                      
                      74205530042APIPS
                      
                      Upton
                      
                      TX
                      
                      6
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845754
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 43A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 43A
                      
                      74205530043APIPS
                      
                      Upton
                      
                      TX
                      
                      10
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845674
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 45A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 45A
                      
                      7420553045APIPS
                      
                      Upton
                      
                      TX
                      
                      24
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845690
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 48A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 48A
                      
                      7420553004SAPIPS
                      
                      Upton
                      
                      TX
                      
                      12
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845694
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 51A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 51A
                      
                      74205530051APIPS
                      
                      Upton
                      
                      TX
                      
                      11
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845679
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 52A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 52A
                      
                      74205530052APIPS
                      
                      Upton
                      
                      TX
                      
                      14
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845698
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 53A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 53A
                      
                      74205530053APIPS
                      
                      Upton
                      
                      TX
                      
                      20
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845695
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 68A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 68A
                      
                      7420553006SAPIPS
                      
                      Upton
                      
                      TX
                      
                      7
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845696
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 69A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 69A
                      
                      74205530069APIPS
                      
                      Upton
                      
                      TX
                      
                      10
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845677
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 6A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 6A
                      
                      74205530006APIPS
                      
                      Upton
                      
                      TX
                      
                      35
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845680
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR70A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 70A
                      
                      74205530070APIPS
                      
                      Upton
                      
                      TX
                      
                      43
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845697
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 71A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 71A
                      
                      74205530071APIPS
                      
                      Upton
                      
                      TX
                      
                      21
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845678
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 7A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 7A
                      
                      74205530007APIPS
                      
                      Upton
                      
                      TX
                      
                      52
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845683
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 85A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 85A
                      
                      74205530085APIPS
                      
                      Upton
                      
                      TX
                      
                      33
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845692
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 89A
                      
                      N.
      PEMBROOK SPRABERRY UT T R89A
                      
                      74205530089APIPS
                      
                      Upton
                      
                      TX
                      
                      30
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845693
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR90A
                      
                      N.
      PEMBROOK SPRABERRY UT TR 90A
                      
                      74205530090APIPS
                      
                      Upton
                      
                      TX
                      
                      45
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      251018
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 6
                      
                      N.
      PEMBROOK SPRBY UT TR 6/67/85
                      
                      742055240000PIPS
                      
                      Upton
                      
                      TX
                      
                      11
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      251018
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 67
                      
                      N.
      PEMBROOK SPRBY UT TR 6/67/85
                      
                      742055240000PIPS
                      
                      Upton
                      
                      TX
                      
                      4
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      251016
                      
                      55598
                      
                      55598
                      
                      75550
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      NORTH
      PEMBROOK SPRABERRY UNIT TR 85
                      
                      N.
      PEMBROOK SPRBY UT TR 6/67/85
                      
                      742055240000PIPS
                      
                      Upton
                      
                      TX
                      
                      15
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845894
                      
                      55968
                      
                      55968
                      
                      75605
                      
                      1.00000000
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SHERROD
      44
                      
                      SHERROD
      44
                      
                      742055430000PIPS
                      
                      Upton
                      
                      TX
                      
                      2
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      291058
                      
                      55671
                      
                      60639
                      
                      74650
                      
                      0.94445940
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPBY
      DRIVER 101/105/153/159/193/215/221
                      
                      SPBY
      DRIVER-PON PL
                      
                      742055460000PIPS
                      
                      Reagan
                      
                      TX
                      
                      86
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845366
                      
                      55671
                      
                      60640
                      
                      74652
                      
                      0.96217680
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 12A
                      
                      SPRABERRY
      DRIVER UT- TR 12A
                      
                      74205547012APIPS
                      
                      Reagan
                      
                      TX
                      
                      55
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845452
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 160A
                      
                      SPRABERRY
      DRIVER UT- TR 160A
                      
                      74205547160APIPS
                      
                      Reagan
                      
                      TX
                      
                      28
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845713
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 185A
                      
                      SPRABERRY
      DRIVER UT- TR 185A
                      
                      74205547185APIPS
                      
                      Reagan
                      
                      TX
                      
                      11
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845369
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 188A
                      
                      SPRABERRY
      DRIVER UT- TR 188A
                      
                      74205547188APIPS
                      
                      Glasscock
                      
                      TX
                      
                      12
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845373
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 194A
                      
                      SPRABERRY
      DRIVER UT- TR 194A
                      
                      74205547194APIPS
                      
                      Reagan
                      
                      TX
                      
                      21
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845469
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 195A
                      
                      SPRABERRY
      DRIVER UT- TR 195A
                      
                      74205547195APIPS
                      
                      Reagan
                      
                      TX
                      
                      88
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845368
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 215A
                      
                      SPRABERRY
      DRIVER UT- TR 215A
                      
                      74205547215APIPS
                      
                      Reagan
                      
                      TX
                      
                      14
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845905
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 222A
                      
                      SPRABERRY
      DRIVER UT- TR 222A
                      
                      74205547222APIPS
                      
                      Reagan
                      
                      TX
                      
                      4
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845708
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 232A
                      
                      SPRABERRY
      DRIVER UT- TR 232A
                      
                      74205547232APIPS
                      
                      Reagan
                      
                      TX
                      
                      40
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845904
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 221A
                      
                      SPRABERRY
      DRIVER UT-TR 221A
                      
                      74205547221APIPS
                      
                      Reagan
                      
                      TX
                      
                      19
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845829
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNITTR 101A
                      
                      SPRABERRY
      DRIVER UT- TR 101A
                      
                      74205547101APIPS
                      
                      Reagan
                      
                      TX
                      
                      180
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845492
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 102A
                      
                      SPRABERRY
      DRIVER UT- TR 102A
                      
                      74205547102APIPS
                      
                      Reagan
                      
                      TX
                      
                      70
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845700
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 105A
                      
                      SPRABERRY
      DRIVER UT- TR 105A
                      
                      74205547105APIPS
                      
                      Reagan
                      
                      TX
                      
                      19
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845847
                      
                      55671
                      
                      60640
                      
                      74652
                      
                      0.96217680
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNIT TR 11A
                      
                      SPRABERRY
      DRIVER UT- TR 11A
                      
                      74205547011APIPS
                      
                      Reagan
                      
                      TX
                      
                      15
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845494
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNITTR 130A
                      
                      SPRABERRY
      DRIVER UT-TR 130A
                      
                      74205547130APIPS
                      
                      Reagan
                      
                      TX
                      
                      23
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845709
                      
                      55671
                      
                      55671
                      
                      74653
                      
                      0.96217600
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNITTR 131A
                      
                      SPRABERRY
      DRIVER UT- TR 131A
                      
                      74205547131APIPS
                      
                      Reagan
                      
                      TX
                      
                      38
                      
                      -0.30WTI
                      
                      Trojan
      Pl
                      
                      03/01/2004
                      
                      845962
                      
                      55671
                      
                      60641
                      
                      74699
                      
                      0.94445940
                      
                      B014
                      
                      PIONEER
      NATURAL RES. USA, INC.
                      
                      SPRABERRY
      DRIVER UNITTR 14
                      
                      SPRABERRY
      DRIVER UT- TR 14
                      
                      742055470014PIPS
                      
                      Reagan
                      
                      TX
                      
                      18
                      
                      -0.30
  
  Crude
      Type
                        
                        Transporter
                        
                        Start
      Data
                        
                        Carrier
      Lease ID #
                        
                        EMOC
      RC
                        
                        RPC
                        
                        DO
                        
                        Decimal
                        
                        Old
      XOM Contract #
                        
                        Operator
                        
                        Lease
      Name
                        
                        ALLEGO
      LEASE NAME
                        
                        0XY
      Lease #
                        
                        County
                        
                        State
                        
                        B7D
                        
                        Lease
      DeltaWTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845699
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrTTR 151A
                        
                        SPRABERRY
      DRIVER UT- TR 151A
                        
                        74205547151APIPS
                        
                        Reagan
                        
                        TX
                        
                        25
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845498
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 152A
                        
                        SPRABERRY
      DRIVER UT-TR152A
                        
                        74205547152AP1PS
                        
                        Reagan
                        
                        TX
                        
                        21
                        
                        -0.30WTI
                        
                        Trojan
      R
                        
                        03701/2004
                        
                        845592
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrTTR 153A
                        
                        SPRABERRY
      DRIVER UT-TR153A
                        
                        74205547153APIPS
                        
                        Reagan
                        
                        TX
                        
                        73
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845714
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrTTR 187A
                        
                        SPRABERRY
      DRIVER UT- TR 187A
                        
                        74205547187APIPS
                        
                        Reagan
                        
                        TX
                        
                        71
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        645372
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 189A
                        
                        SPRABERRY
      DRIVER UT- TR 189A
                        
                        74205547189APIPS
                        
                        Reagan
                        
                        TX
                        
                        16
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845820
                        
                        55671
                        
                        60640
                        
                        74652
                        
                        0.96217680
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 18
                        
                        SPRABERRY
      DRIVER UT-TR 18A
                        
                        74205547018APIPS
                        
                        Reagan
                        
                        TX
                        
                        15
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845371
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNITTR 190A
                        
                        SPRABERRY
      DRIVER UT-TR 190A
                        
                        74205547190APPS
                        
                        Reagan
                        
                        TX
                        
                        30
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        645370
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 191A
                        
                        SPRABERRY
      DRIVER UT- TR 191A
                        
                        74205547191APIPS
                        
                        Reagan
                        
                        TX
                        
                        16
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845702
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.98217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 192A
                        
                        SPRABERRY
      DRIVER UT- TR 192A
                        
                        74205547192APPS
                        
                        Reagan
                        
                        TX
                        
                        11
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845703
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 193A
                        
                        SPRABERRY
      DRIVER UT-TR 193A
                        
                        74205547193APIPS
                        
                        Reagan
                        
                        TX
                        
                        34
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845383
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B0H
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrT TR 220A
                        
                        SPRABERRY
      DRIVER UT- TR 220A
                        
                        74205547220APIPS
                        
                        Reagan
                        
                        TX
                        
                        50
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845794
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrTTR 226A
                        
                        SPRABERRY
      DRIVER UT- TR 226A
                        
                        74205547226APIPS
                        
                        Reagan
                        
                        TX
                        
                        94
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845729
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrTTR 229
                        
                        SPRABERRY
      DRIVER UT- TR 229
                        
                        742055470229PIPS
                        
                        Reagan
                        
                        TX
                        
                        41
                        
                        -0.30WTI
                        
                        Trojan pi
                        
                        03/01/2004
                        
                        845930
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 230A
                        
                        SPRABERRY
      DRIVER UT- TR 230A
                        
                        74205547230APIPS
                        
                        Reagan
                        
                        TX
                        
                        19
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845451
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNrTTR 47A
                        
                        SPRABERRY
      DRIVER UT- TR47A
                        
                        74205547047AP1PS
                        
                        Reagan
                        
                        TX
                        
                        32
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845965
                        
                        55671
                        
                        60641
                        
                        74699
                        
                        0.94445940
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 62
                        
                        SPRABERRY
      DRIVER UT- TR 62
                        
                        742055470062PIPS
                        
                        Reagan
                        
                        TX
                        
                        19
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845966
                        
                        55671
                        
                        60640
                        
                        74652
                        
                        0.96217680
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 62A
                        
                        SPRABERRY
      DRIVER UT-TR 62A
                        
                        74205547062APIPS
                        
                        Reagan
                        
                        TX
                        
                        18
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845503
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 154A
                        
                        SPRABERRY
      DRIVER UT TR 154A
                        
                        74205547154APIPS
                        
                        Reagan
                        
                        TX
                        
                        17
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845314
                        
                        55671
                        
                        60184
                        
                        74651
                        
                        0.96217680
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 214A
                        
                        SPRABERRY
      DRIVER UT TR 214A
                        
                        74205547214APIPS
                        
                        Reagan
                        
                        TX
                        
                        31
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845963
                        
                        55671
                        
                        60640
                        
                        74652
                        
                        0.96217680
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 17
                        
                        SPRABERRY
      DRIVER UT TR 17
                        
                        742055470017PIPS
                        
                        Reagan
                        
                        TX
                        
                        7
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        B45964
                        
                        55671
                        
                        60641
                        
                        74699
                        
                        0.94445940
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 17A
                        
                        SPRABERRY
      DRIVER UT TR 17A
                        
                        74205547017APIPS
                        
                        Reagan
                        
                        TX
                        
                        11
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845812
                        
                        55671
                        
                        60184
                        
                        74651
                        
                        0.96217680
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 67A
                        
                        SPRABERRY
      DRIVER UT TR 87A
                        
                        74205547087APIPS
                        
                        Reagan
                        
                        TX
                        
                        24
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845507
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 104A
                        
                        SPRABERRY
      DRIVER UTTR104A
                        
                        74205547104APIPS
                        
                        Reagan
                        
                        TX
                        
                        15
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845382
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR219A
                        
                        SPRABERRY
      DRIVER UT-1
                        
                        742055470001PIPS
                        
                        Reagan
                        
                        TX
                        
                        4
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845508
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 159A
                        
                        SPRABERRY
      DRIVER UT-2
                        
                        742055470002PIPS
                        
                        Reagan
                        
                        TX
                        
                        15
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845832
                        
                        55671
                        
                        55671
                        
                        74653
                        
                        0.96217600
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR 129A
                        
                        SPRABERRY
      DRIVER UT-3
                        
                        742055470003PIPS
                        
                        Reagan
                        
                        TX
                        
                        7
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845914
                        
                        55671
                        
                        60184
                        
                        74651
                        
                        0.96217680
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        SPRABERRY
      DRIVER UNIT TR72A
                        
                        SPRABERRY
      DRIVER UT-4
                        
                        742055470004PIPS
                        
                        Midland
                        
                        TX
                        
                        6
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        845600
                        
                        55589
                        
                        55590
                        
                        75544
                        
                        1.00000000
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        TIPPETT
      D
                        
                        TIPPETT
      D
                        
                        742055510000PIPS
                        
                        Midland
                        
                        TX
                        
                        150
                        
                        -0.30WTI
                        
                        Trojan
      PI
                        
                        03/01/2004
                        
                        200001
                        
                        55935
                        
                        55935
                        
                        75736
                        
                        1.00000000
                        
                        B014
                        
                        PIONEER
      NATURAL RES.
                          USA,
      INC.
                        
                        WINDHAM
      J
                        
                        WINDHAM
      J
                        
                        742055630000PIPS
                        
                        Midland
                        
                        TX
                        
                        11
                        
                        -0.302760
 Occidental
      Energy Marketing, Inc.
              5
      Greenways Plaza, Suite 110, Houston, Texas 77046-0521
                P.O.
      Box 27570, Houston, Texas 77227-7570
                Phone
      713.215.7000A
      subsidiary of Occidental Petroleum Corporation
  
 CRUDE
OIL CONTRACT AMENDMENT No. 5
  VIA FAX:
  
 TO:
              Pioneer
      Natural Resources USA, Inc.Attn:
      Contract Management ServicesFax:
      (972)969-3574Trader:
      Deb StewartFROM:
              Occidental
      Energy Marketing, Inc.Trader:
      Marc AbbottRE:
              Occidental
      Contract # 0403-PNR-13605-P
              Amendment
      #5
  This
Amendment Number 5 to the Crude Oil Contract between Occidental Energy
Marketing, Inc. ("OEMI") and Pioneer Natural Resources USA, Inc. ("Counterparty)
dated March, 2004 (the "Contract") is entered into as of December 16,
2009.
  For good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged and agreed, the Parties agree that the Contract is hereby amended
effective December 1, 2009 as set forth below.
  Delete
the O Neal and J W Driver #7 leases off the contract and Exhibit "A" due to
these leases being commingled into other leases.
  All other
terms of the agreement are unchanged.
  Agreed to
and approved by: OEMI
  /s/
      Marc AbbottMarc
      AbbottManager,
      Crude Oil AcquisitionsAgreed
      to and approved by:PioneepNatural
      Resources USA, Inc./s/
      Hershal
      K. WolfeHershal
      K. WolfeVice
      President Marketing
  
 
 EXHIBIT
"A"
 OEMI'S
Contract #0403-PNR-13605-P#4
 Contract
#
 Allegro
Contract #119309
  Crude
      Type
              
              Transporter
              
              Start
      Date
              
              Carrrler
      Lease ID#
              
              EMOC
      RC
              
              RPC
              
              DO
              
              Decimal
              
              Old
      XOM Contract #
              
              Operator
              
              Lease
      Name
              
              OXY
      ALLEGO LEASE NAME
              
              OXY
      Lease #
              
              County
              
              State
              
              Location
      DifferentialWTI
              
              OET
      Trks
              
              08/01/2007
              
              60015
              
              
              
              
              
              
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC
              
              EISNER
      CHRISTY
              
              EISNER
      CHRISTY
              
              742074790000PITS
              
              Reagan
              
              TX
              
              0.53WTI
              
              OET
      Tries
              
              03/01/2004
              
              46451
              
              56059
              
              56059
              
              75159
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BIZZELL
      A
              
              BIZZELL
      A
              
              742054740000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46681
              
              59211
              
              78015
              
              76706
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BIZZELLE
      B UNIT
              
              BIZZELLE
      B UT
              
              742054750000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46290
              
              59209
              
              78014
              
              76703
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BIZZELLE
      UNIT#1
              
              BIZZELLE
      UT #1
              
              742054760000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46990
              
              59198
              
              59198
              
              76552
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BONNIE
      UNIT
              
              BONNIE
      UT
              
              742054770000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46402
              
              59195
              
              59195
              
              76548
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BUD
              
              BUD
              
              742054780000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47484
              
              59225
              
              59225
              
              76908
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DICKENSON
      OLTON
              
              DICKENSON
      OLTON
              
              742054890000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45927
              
              59225
              
              60709
              
              76908B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DICKENSON
      OLTON B
              
              DICKENSON
      OLTON B
              
              742054900000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              44727
              
              59225
              
              60710
              
              78908C
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DICKENSON
      OLTON C
              
              DICKENSON
      OLTON C
              
              742054910000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45990
              
              56117
              
              56117
              
              75183
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DORIS
              
              DORIS
              
              742054920000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50512
              
              55581
              
              55581
              
              75043
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DRIVER
      A 1.2.3
              
              DRIVER
      A 1.2,3
              
              742054930000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47375
              
              59213
              
              59213
              
              76725
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DUSEK
              
              DUSEK
              
              742054940000PITS
              
              Upton
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              52862
              
              55914
              
              55914
              
              75531
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES, USA, INC.
              
              E T
      O'DANIEL #37
              
              E T
      ODANIEL #37
              
              742054960000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50495
              
              55995
              
              55995
              
              75038
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC,
              
              EILAND
      A
              
              EILAND
      A
              
              742054970000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50538
              
              55582
              
              55582
              
              75044
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              GERMANIA
      DEAN TR 2
              
              GERMANIA
      205 A DEAN
              
              742054990205PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50750
              
              63382
              
              63382
              
              78055
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES, USA, INC.
              
              GERMANIA
      DEAN TR 3
              
              GERMANIA
      TRACT 3
              
              742054990003PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50751
              
              55584
              
              59821
              
              75039
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA, INC
              
              GERMANIA
      DEAN TR 4
              
              GERMANIA
      TRACT 4
              
              742054990004PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50837
              
              63383
              
              63383
              
              78056
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA. INC
              
              GERMANIA
      DEAN TR 5
              
              GERMANIA
      TRACT 5
              
              742054990005PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50677
              
              55584
              
              55584
              
              75087
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA, INC
              
              GERMANIA
      DEAN TR 6
              
              GERMANIA
      TRACT 6 DEAN
              
              742054890006PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47967
              
              59219
              
              60840
              
              76773B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA. INC
              
              GREATHOUSE
              
              GREATHOUSE
              
              742055010000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47561
              
              59219
              
              59219
              
              76773
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC
              
              GREATHOUSE
      C
              
              GREATHOUSE
      C
              
              742055030000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47488
              
              56144
              
              56144
              
              75191
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC
              
              HARVARDC
              
              HARVARD
      C
              
              742055050000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46412
              
              59196
              
              78016
              
              78549
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              IRENE
              
              IRENE
              
              742055060000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47431
              
              59002
              
              59002
              
              76723
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC
              
              IRVIN
      UNIT
              
              IRVIN
      UT
              
              742055070000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              53258
              
              55885
              
              55885
              
              75707
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              J W
      DRIVER #6
              
              J W
      DRIVER #6
              
              742055080000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50479
              
              56004
              
              56004
              
              75039
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              JUDKINS
      G 1. 2, 3
              
              JUDKINS
      G 1.2, 3
              
              742055120000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              54768
              
              09796
              
              09796
              
              75196
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              JULIETTE
              
              JULIETTE
              
              742055140000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50862
              
              56159
              
              56159
              
              75197
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              KELLY
      STEPHENS
              
              KELLY
      STEPHENS
              
              742055150000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45522
              
              73539
              
              73539
              
              76901B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES- USA, INC.
              
              LINDSEY
              
              LINDSEY
              
              742055160000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47977
              
              65505
              
              65505
              
              77804
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MCBRENDA
      NO 1 UNIT
              
              MCBRENDA
      NO 1 UT
              
              742055180000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46510
              
              59461
              
              59461
              
              76702
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MCMORRIES
      A
              
              MCMORRIES
      A
              
              742054700000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              51104
              
              56379
              
              56379
              
              75458
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 21
              
              MIDKIFF
      DEAN UT TRACT 21
              
              742055190021PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              53400
              
              56379
              
              62752
              
              75459
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 22A
              
              MIDKIFF
      DEAN UT TRACT 22A
              
              74205519022APITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              51256
              
              56379
              
              60730
              
              75464
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 47
              
              MIDKIFF
      DEAN UT TRACT 47
              
              742055190047PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              51281
              
              56379
              
              60626
              
              75465
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              MIDKIFF
      DEAN UNIT TRACT 48
              
              MIDKIFF
      DEAN UT TRACT 48
              
              742055190048PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              51282
              
              56379
              
              60627
              
              75466
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNrT TRACT 61
              
              MIDKIFF
      DEAN UT TRACT 61
              
              742055190061PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50713
              
              56379
              
              60626
              
              75469
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 67
              
              MIDKIFF
      DEAN UT TRACT 67
              
              742055190067PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50714
              
              56379
              
              60629
              
              75470
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 68
              
              MIDKIFF
      DEAN UT TRACT 68
              
              742055190068PITS
              
              Midland
              
              TX
              
              0,53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46969
              
              60944
              
              60944
              
              77772
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MO
      MAC A
              
              MO
      MAC A
              
              742055200000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50056
              
              65504
              
              65504
              
              77803
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MO-MCB
              
              MO-MCB
              
              742055220000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47590
              
              59466
              
              60737
              
              76895
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              NEALF
              
              NEALF
              
              742055270000PITS
              
              Upton
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46764
              
              59197
              
              59197
              
              76551
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              NEILL
              
              NEILL
              
              742055280000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50386
              
              56099
              
              56099
              
              75177
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC
              
              O'DANIEL
      C, D
              
              ODANIEL
      C, D
              
              742055320000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50071
              
              56095
              
              56095
              
              75175
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              ORSON
      0
              
              ORSON
      0
              
              742055340000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47485
              
              56207
              
              56207
              
              75204
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              RAYFORD-MCALISTER
              
              RAYFORD-MCALISTER
              
              742055360000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45944
              
              56209
              
              56209
              
              75205
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              ROBERTSON
              
              ROBERTSON
              
              742055370000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45701
              
              56106
              
              56106
              
              75212
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              STIMSON-BURLEY
      J
              
              STIMSON-BURLEY
      J
              
              742055480000PrTS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45702
              
              56062
              
              56062
              
              75211
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              STIMSON-BURLEY
      K
              
              STIMSON-BURLEY
      K
              
              742055490000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45703
              
              56060
              
              56060
              
              75210
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              STIMSON-BURLEY
      L
              
              STIMSON-BURLEY
      L
              
              742055500000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              57042
              
              56093
              
              56093
              
              75174
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              TXL
      G #1
              
              TXLG#1
              
              742055520000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45926
              
              56115
              
              56115
              
              75214
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA, INC
              
              ULMER
              
              ULMER
              
              742055540000PITS
              
              Upton
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46941
              
              59226
              
              59226
              
              78914
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA, INC.
              
              WELCH
      E
              
              WELCH
      E
              
              742055560000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50046
              
              59226
              
              60712
              
              78914B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WELCH
      F
              
              WELCH
      F
              
              742055570000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              47577
              
              54709
              
              54709
              
              73879B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WETSEL
      A
              
              WETSEL
      A
              
              742055580000PITS
              
              Martin
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              44878
              
              60973
              
              60973
              
              77919
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      D
              
              WINDHAM
      D
              
              742055590000PITS
              
              Upton
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              45705
              
              60973
              
              87224
              
              77919B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              WINDHAM
      E
              
              WINDHAM
      E
              
              742055600000PITS
              
              Upton
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46401
              
              60942
              
              60942
              
              77787
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      F
              
              WINDHAM
      F
              
              742055610000PITS
              
              Upton
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              46632
              
              56061
              
              56061
              
              75160
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      G
              
              WINDHAM
      G
              
              742055620000PITS
              
              Midland
              
              TX
              
              0.53WTI
              
              OET
      Trks
              
              03/01/2004
              
              50226
              
              60928
              
              80928
              
              77228
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES USA, INC.
              
              WINDHAM
      S
              
              WINDHAM
      S
              
              742055640000PITS
              
              Upton
              
              TX
              
              0.53
  
  Occidental
      Energy Marketing, Inc.
              5
      Greenway Plaza, Suite 110, Houston, Texas 77046-0521
                P.O.
      Box 27570, Houston, Texas 77227-7570
                Phone
      713.215.7000A
      subsidiary of Occidental Petroleum Corporation
  
  VIA FAX:
972-969-3574
  TO:                DEB
STEWART - PIONEER NATURAL RESOURCES USA, INC. - PHONE 972-969-3855
 FROM:   
MARK HAFNER- OCCIDENTAL ENERGY
MARKETING, INC. - PHONE 432-685-5884
  REFERENCE:  
OCCIDENTAL CONTRACT NUMBER: 0403-PNR-13605-P
 PIONEER
NATURAL RESOURCES USA, INC. CONTRACT NUMBER:
  THIS FAX
CONFIRMS THE AGREEMENT BETWEEN DEB STEWART OF PIONEER NATURAL RESOURCES USA,
INC. AND MARK HAFNER OF OCCIDENTAL ENERGY MARKETING, INC. ON FEBRUARY 1, 2004.
THE FOLLOWING DETAILS ARE OCCIDENTAL'S UNDERSTANDING:
  SELLER:              
PIONEER NATURAL RESOURCES USA, INC. ("PIONEER")
 BUYER:               
 OCCIDENTAL ENERGY MARKETING, INC. ("OCCIDENTAL")
  1.
              VOLUME: APPROXIMATELY 638 BARRELS PER DAY
      EXACT VOLUME EQUAL TO THE PRODUCTION FROM THE LEASES ON ATTACHED EXHIBIT
      "A"
  2.
                QUALITY/GRADE:WEST
      TEXAS INTERMEDIATE
  3.
              DELIVERY POINT:TITLE
      AND RISK OF LOSS SHALL PASS FROM PIONEER TO OCCIDENTAL AS THE CRUDE OIL
      ENTERS THE FACILITIES OF OCCIDENTAL'S DESIGNATED
  TRUCKER.
  4.
              TERM:MARCH  1 - 31,
      2004 AND CONTINUING MONTH TO MONTH THEREAFTER
      SUBJECT TO A 30 DAY ADVANCE WRITTEN NOTICE OF CANCELLATION BY EITHER
      PARTY.
  5.
              PRICE:KOCH PETROLEUM GROUP L.P.
      MONTHLY EDQ POSTED PRICE FORWEST TEXAS/NEW MEXICO INTERMEDIATE DEEMED 40.0
      DEGREES FOR THE MONTH OF DELIVERY, PLUS THE AVERAGE OF THE *PLATTS DAILY
      ASSESSMENTS OF WTI-P PLUS LESS THE DIFFERENCE BETWEEN (PLATTS WTI-CUSHING
      LESS PLATTS WTI-MEDLAND) PLUS DELTA DOLLARS PER BARREL SET OUT ON EXHIBIT
      "A".
  * NOTE
ALL PLATTS PRICING IS FOR THE DELIVERY MONTH AS PUBLISHED BY PLATTS DURING THE
PERIOD BEGINNING ON THE 26TH OF THE SECOND MONTH PRECEEDING THE DELIVERY MONTH
AND ENDING ON THE 25TH OF THE MONTH PRECEEDING THE DELIVERY MONTH.
  6.
              PAYMENT:PAYMENT UNDER THIS CONTRACT
      SHALL BE MADE BY WIRE TRANSFER ON THE TWENTIETH (20TH) CALENDAR DAY OF THE
      MONTH FOLLOWING THE MONTH OF DELIVERY LESS APPLICABLE TAXES. IF THE
      PAYMENT DUE DATE FALLS ON A SATURDAY OR BANK HOLIDAY (EXCEPT MONDAY),
      PAYMENT WILL BE MADE ON THE PRECEDING BUSINESS DAY. IF PAYMENT DUE DATE
      FALLS ON A SUNDAY OR MONDAY HOLIDAY, PAYMENT WILL BE MADE ON THE FOLLOWING
      BUSINESS DAY. PAYMENT SHOULD BE MADE TO BANK OF AMERICA, FOR THE ACCOUNT
      OF PIONEER NATURAL RESOURCES USA, INC., ACCOUNT NO. XXXXXXXXXX, ABA NO.
      XXXXXXXXX.
  7.
              COMMENTS AND SPECIAL
      PROVISIONS:CONOCO'S GENERAL TERMS AND CONDITIONS TO
      APPLY.
  
 APPROVED
      BY:
              /s/ john t.
      mcwhorterjohn t.
      mcwhorteroccidental energy
      marketing, inc.APPROVED
      BY:
              /s/Hershal K. Wolfepioneer
      natural resources usa, inc.
 
  EXHIBIT
"A"
  OEMI'S
Contract #0403-PNR-13605-P Contract# Allegro Contract #114659
 
  Crude
      Type
              
              Transporter
              
              Start
      Date
              
              Carrier 
      Lease to ID #
              
              EMOCRC
              
              RPC
              
              DO
              
              Decimal
              
              Old
      XOM Contract #
              
              Operator
              
              Lease
      Name
              
              OXY
      ALLEGO LEASE NAME
              
              OXY
      Lease*
              
              County
              
              State
              
              BID
              
              Lease
      DeltaWTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46451
              
              56059
              
              56059
              
              75159
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BIZZELLA
              
              BIZZELLA
              
              742054740000PITS
              
              Midland
              
              TX
              
              7
              
              -0.53wn
              
              Genesis
      Trks
              
              03/01/2004
              
              46681
              
              59211
              
              78015
              
              78706
              
              1.00000000
              
              B0I2D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BIZZELLE
      B UNIT
              
              BIZZELLE
      B UT
              
              742054750000PrrS
              
              Midland
              
              TX
              
              11
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46290
              
              59209
              
              76014
              
              76703
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BIZZELLE
      UNrTf/1
              
              BIZZELLE
      UT #1
              
              742054760000PITS
              
              Midland
              
              TX
              
              5
              
              -053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46990
              
              59196
              
              59198
              
              76552
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BONNE
      UNrT
              
              BONNIE
      UT
              
              742054770000PrTS
              
              Midland
              
              TX
              
              7
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46402
              
              59195
              
              59195
              
              76548
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              BUD
              
              BUD
              
              742054780000PITS
              
              Midland
              
              TX
              
              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47484
              
              59225
              
              59225
              
              76908
              
              1
      00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DICKENSON
      OLTON
              
              DICKENSON
      OLTON
              
              742054890000PITS
              
              Martin
              
              TX
              
              1
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45927
              
              59225
              
              60709
              
              76908B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DICKENSON
      OLTON B
              
              DICKENSON
      OLTON B
              
              742054900000PrrS
              
              Martin
              
              TX
              
              4
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              44727
              
              59225
              
              60710
              
              76908C
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              DICKENSON
      OLTON C
              
              DICKENSON
      OLTON C
              
              742054910000PITS
              
              Martin
              
              TX
              
              5
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45990
              
              56117
              
              56117
              
              75183
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DORIS
              
              DORIS
              
              742054920000PITS
              
              Midland
              
              TX
              
              9
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50512
              
              55581
              
              55581
              
              75043
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DRIVER
      A 1,2,3
              
              DRIVER
      A 1,2,3
              
              742054930000PITS
              
              Midland
              
              TX
              
              21
              
              -053WTI
              
              Genesis
      Trik
              
              03/01/2004
              
              47375
              
              59213
              
              59213
              
              76725
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              DUSEK
              
              DUSEK
              
              742054940000PITS
              
              Upton
              
              TX
              
              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              52862
              
              55914
              
              55914
              
              75531
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              E T
      O'DANIEL #37
              
              E T
      ODANEL #37
              
              742054960000PITS
              
              Midland
              
              TX
              
              20
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50495
              
              55995
              
              55995
              
              75038
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              EILAND
      A
              
              EILAND
      A
              
              742054970000PITS
              
              Midland
              
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              20
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50538
              
              55562
              
              55582
              
              75044
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              GERMAN
      IA DEAN TR 2
              
              GERMANIA
      205 A DEAN
              
              742054990205PITS
              
              Midland
              
              TX
              
              26
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50750
              
              63382
              
              63382
              
              78055
              
              1.00000000
              
              B0120
              
              PIONEER
      NATURAL RES. USA, INC.
              
              GERMAN
      IA DEAN TR 3
              
              GERMANIA
      TRACT 3
              
              742054990003PITS
              
              Midland
              
              TX
              
              145
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50751
              
              55584
              
              59821
              
              75089
              
              1.00000000
              
              B012D
              
              PIONEER
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              GERMAN
      IA DEAN TR 4
              
              GERMANIA
      TRACT 4
              
              742054990004PrTS
              
              Midland
              
              TX
              
              26
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50837
              
              83383
              
              63383
              
              78056
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              GERMANIA
      DEANTR5
              
              GERMANIA
      TRACT 5
              
              742054990005PITS
              
              Midland
              
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              7
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50677
              
              55584
              
              55584
              
              75087
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              GERMAN
      IA DEAN TR 8
              
              GERMANIA
      TRACT 6 DEAN
              
              742054990006PITS
              
              Midland
              
              TX
              
              8
              
              �033WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47967
              
              59219
              
              60S40
              
              76773B
              
              1.00000000
              
              B012D
              
              PIONEER
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              GREATHOUSE
              
              GREATHOUSE
              
              742055010000PITS
              
              Martin
              
              TX
              
              9
              
              �053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47561
              
              59219
              
              59219
              
              76773
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              GREATHOUSE
      C
              
              GREATHOUSE
      C
              
              742055030000PITS
              
              Martin
              
              TX
              
              1
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47488
              
              56144
              
              56144
              
              75191
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              HARVARDC
              
              HARVARD
      C
              
              742055050000PITS
              
              Martin
              
              TX
              
              4
              
              -053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46412
              
              59196
              
              78016
              
              76549
              
              1.00000000
              
              B012D
              
              PIONEER
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              IRENE
              
              IRENE
              
              742055060000PITS
              
              Midland
              
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              10
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47431
              
              59002
              
              59002
              
              76723
              
              1.00000000
              
              B012D
              
              PIONEER
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              IRVIN
      UNIT
              
              IRVIN
      UT
              
              742055070000PITS
              
              Midland
              
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              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              53258
              
              55885
              
              55885
              
              75707
              
              1.00000000
              
              B012D
              
              PIONEER
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              J W
      DRIVER #6
              
              J W
      DRIVER #6
              
              742055080000PITS
              
              Midland
              
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              4
              
              -0.53wn
              
              Genesis
      Trks
              
              03/01/2004
              
              53258
              
              55615
              
              55615
              
              75695
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              J W
      DRIVER #7
              
              J W
      DRIVER #7
              
              742055090000PITS
              
              Midland
              
              TX
              
              4
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50479
              
              56004
              
              56004
              
              75039
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              JUDKINS
      G 1,2,3
              
              JUDKINS
      G 1,2. 3
              
              742055120000PITS
              
              Midland
              
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              17
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              54766
              
              09796
              
              09796
              
              75196
              
              1.00000000
              
              B012D
              
              PIONEER
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              JULIETTE
              
              JULIETTE
              
              742055140000PITS
              
              Mart*
              
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              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50862
              
              56159
              
              56159
              
              75197
              
              1.00000000
              
              B012D
              
              PIONEER
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              KELLY
      STEPHENS
              
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      STEPHENS
              
              742055150000PITS
              
              Midland
              
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              7
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45522
              
              73539
              
              73539
              
              76901B
              
              1.00000000
              
              B012D
              
              PIONEER
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              LINDSEY
              
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              742055160000PITS
              
              Martin
              
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              5
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47977
              
              65505
              
              65505
              
              77804
              
              1.00000000
              
              B012D
              
              PIONEER
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              MCBRENDA
      NO 1 UNrT
              
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              742055180000PrTS
              
              Martin
              
              TX
              
              10
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46510
              
              59461
              
              59461
              
              76702
              
              1.00000000
              
              B012D
              
              PIONEER
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              MCMORRIES
      A
              
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              742054700000PrTS
              
              Martin
              
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              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              51104
              
              56379
              
              56379
              
              75458
              
              1.00000000
              
              BC112D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKFF
      DEAN UNIT TRACT 21
              
              MIOKFF
      DEAN UT TRACT 21
              
              742055190021
      PrrS
              
              Midland
              
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              7
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              53400
              
              56379
              
              62752
              
              75459
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 22A
              
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              74205519022APITS
              
              Midland
              
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              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              51256
              
              56379
              
              60730
              
              75464
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 47
              
              MIDKIFF
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              742055190047PITS
              
              Midland
              
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              13
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              51281
              
              56379
              
              60626
              
              75465
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKIFF
      DEAN UNIT TRACT 48
              
              MIDKFF
      DEAN UT TRACT 48
              
              742055190048PITS
              
              Midland
              
              TX
              
              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              51282
              
              56379
              
              60627
              
              75466
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKFF
      DEAN UNIT TRACT 61
              
              MIDKFF
      DEAN UT TRACT 61
              
              7420S5190061PITS
              
              Midland
              
              TX
              
              9
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50713
              
              56379
              
              60628
              
              75469
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKFF
      DEAN UNIT TRACT 67
              
              MIDKFF
      DEAN UT TRACT 67
              
              742055190067PITS
              
              Midland
              
              TX
              
              7
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50714
              
              56379
              
              60629
              
              75470
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MIDKFF
      DEAN UNrT TRACT 68
              
              MIDKIFF
      DEAN UT TRACT 66
              
              742055190068PITS
              
              Midland
              
              TX
              
              6
              
              -0.53wn
              
              Genesis
      Trks
              
              03/01/2004
              
              46969
              
              60944
              
              60944
              
              77772
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MO
      MAC A
              
              MO
      MAC A
              
              742055200000PITS
              
              Martin
              
              TX
              
              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50056
              
              65504
              
              65504
              
              77803
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              MO-MCB
              
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              742055220000PITS
              
              Martin
              
              TX
              
              16
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47590
              
              59466
              
              60737
              
              76895
              
              1.00000000
              
              B012D
              
              PIONEER
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              NEALF
              
              NEALF
              
              742055270000PITS
              
              Upton
              
              TX
              
              3
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46764
              
              59197
              
              59197
              
              76551
              
              1.00000000
              
              B012D
              
              PIONEER
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              NELL
              
              NEILL
              
              742055260000PITS
              
              Midland
              
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              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45991
              
              56165
              
              56165
              
              75199
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              NELSON
      A
              
              NELSON
      A
              
              742055290000PITS
              
              Midland
              
              TX
              
              7
              
              �0.53wn
              
              Genesis
      Trks
              
              03/01/2004
              
              46452
              
              59210
              
              59210
              
              76704
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              ONEAL
              
              ONEAL
              
              74205531
      0000PITS
              
              Midland
              
              TX
              
              4
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50386
              
              56099
              
              56099
              
              75177
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              O'DANIEL
      C, D
              
              ODANIELC,
      D
              
              742055320000PITS
              
              Midland
              
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              15
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50071
              
              56095
              
              56095
              
              75175
              
              1.00000000
              
              B012D
              
              PIONEER
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              ORSON
      O
              
              ORSON
      O
              
              742055340000PITS
              
              Martin
              
              TX
              
              4
              
              �053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50038
              
              59472
              
              60711
              
              76610B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              ORSONP
              
              ORSONP
              
              742055660000PITS
              
              Martin
              
              TX
              
              4
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50039
              
              59472
              
              60711
              
              76910
              
              1.00000000
              
              B012D
              
              PIONEER
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              ORSON
      0
              
              ORSON
      Q
              
              742055670000PITS
              
              Martin
              
              TX
              
              3
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47485
              
              56207
              
              56207
              
              75204
              
              1.00000000
              
              B012D
              
              PIONEER
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              RAYFORD-MCALISTER
              
              RAYFORD-MCALISTER
              
              742055360000PITS
              
              Midland
              
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              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45944
              
              56209
              
              56209
              
              75205
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              ROBERTSON
              
              ROBERTSON
              
              742055370000PITS
              
              Midland
              
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              3
              
              �0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45701
              
              56106
              
              56106
              
              75212
              
              1.00000000
              
              B012D
              
              PIONEER
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              STIMSON-BURLEYJ
              
              STIMSON-BURLEYJ
              
              742055480000PITS
              
              Midland
              
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              3
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45702
              
              56062
              
              56062
              
              75211
              
              1.00000000
              
              B012D
              
              PIONEER
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              STIMSON-BURLEY
      K
              
              STIMSON-BURLEY
      K
              
              742055490000PITS
              
              Midland
              
              TX
              
              6
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45703
              
              56060
              
              56060
              
              75210
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              STIMSON-BURLEY
      L
              
              STIMSON-BURLEY
      L
              
              742055500000PITS
              
              Midland
              
              TX
              
              4
              
              -053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              57042
              
              56093
              
              56093
              
              75174
              
              1.00000000
              
              B0120
              
              PIONEER
      NATURAL RES. USA, INC.
              
              TXLG#1
              
              TXLG#1
              
              742055520000PITS
              
              Midland
              
              TX
              
              9
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45926
              
              56115
              
              56115
              
              75214
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              ULMER
              
              ULMER
              
              742055540000PITS
              
              Upton
              
              TX
              
              10
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46941
              
              59226
              
              59226
              
              76914
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              WELCH
      E
              
              WELCH
      E
              
              74205S560000PITS
              
              Martin
              
              TX
              
              4
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50046
              
              59226
              
              60712
              
              76914B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WELCH
      F
              
              WELCH
      F
              
              742055570000PrrS
              
              Martin
              
              TX
              
              3
              
              -053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              47577
              
              54709
              
              54709
              
              73879B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WETSELA
              
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              7420S5580000PITS
              
              Martin
              
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              4
              
              -053WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              44878
              
              60973
              
              60973
              
              77919
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      D
              
              WINDHAM
      D
              
              742055590000PITS
              
              Upton
              
              TX
              
              4
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              45705
              
              60973
              
              67224
              
              77919B
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      E
              
              WINDHAM
      E
              
              742055600000PITS
              
              Upton
              
              TX
              
              10
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46401
              
              60942
              
              60942
              
              77767
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      F
              
              WINDHAM
      F
              
              742055610000PrrS
              
              Upton
              
              TX
              
              11
              
              -0.53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              46632
              
              56061
              
              56061
              
              75160
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA. INC.
              
              WINDHAM
      G
              
              WINDHAM
      G
              
              742055620000PITS
              
              Midland
              
              TX
              
              10
              
              -0
      53WTI
              
              Genesis
      Trks
              
              03/01/2004
              
              50226
              
              60928
              
              60928
              
              77228
              
              1.00000000
              
              B012D
              
              PIONEER
      NATURAL RES. USA, INC.
              
              WINDHAM
      S
              
              WINDHAM
      S
              
              742055640000PITS
              
              Upton
              
              TX
              
              6
              
              -0.53638