Document:

Third Amendment to
             Geodyne Institutional/Pension Energy Income Limited
                                 Partnership P-8
                        Agreement of Limited Partnership

      This  Third  Amendment  to  Geodyne  Institutional/Pension  Energy  Income
Limited Partnership P-8 (the "Partnership")  Agreement of Limited Partnership is
entered into by and between Geodyne Properties, Inc. ("Properties"),  a Delaware
corporation,  as  General  Partner,  Geodyne  Institutional  Depositary  Company
("Depositary"),  a  Delaware  corporation,  as  the  Limited  Partner,  and  all
Substituted Limited Partners admitted to the Partnership.

      WHEREAS,  on February 28, 1992,  Properties  and  Depositary  executed and
entered  into  that  certain  PaineWebber/Geodyne  Institutional/Pension  Energy
Income  Limited   Partnership   P-8  Agreement  of  Limited   Partnership   (the
"Agreement"); and

      WHEREAS,  on February 25, 1993,  Properties executed and entered into that
certain First Amendment to the Agreement  whereby it changed (i) the name of the
Partnership  from  "PaineWebber/Geodyne   Institutional/Pension   Energy  Income
Partnership  P-8"  to  "Geodyne   Institutional/Pension  Energy  Income  Limited
Partnership  P-8",  (ii) the  address of the  Partnership's  principal  place of
business,  and (iii) the  address  for the  Partnership's  agent for  service of
process; and

      WHEREAS,  on August 4, 1993,  Properties  executed  and entered  into that
certain Second Amendment to the Agreement in order to (i) expedite the method of
accepting  transfers of Unit Holders' Units in the  Partnership and (ii) provide
for an optional  right of  repurchase/redemption  which may be  exercised by the
Unit Holders; and

      WHEREAS,  Section 11.1 of the Agreement  provides that the General Partner
may, without prior notice or consent of any Unit Holder,  amend any provision of
this  Agreement  if, in its  opinion,  such  amendment  does not have a material
adverse effect upon the Unit Holders; and

      WHEREAS,  Properties as General  Partner desires to amend the Agreement in
order to allow transfers of Units facilitated  through a matching service to the
extent they otherwise comply with Internal Revenue Service transfer  regulations
applicable  to   non-permitted   transfers  for   non-publicly   traded  limited
partnerships.

      NNOW,  THEREFORE,  in  consideration  of  the  covenants,  conditions  and
agreements herein contained, the parties hereto hereby agree as follows:

      I.    Section 8.1G of the Agreement is hereby deleted.

                                      -1-
<PAGE>

      II.   The  remaining   sections  of  Section  8.1  shall  be  renumbered
            accordingly.

      IN WITNESS WHEREOF, the parties hereto have hereunto set their hands as of
this 31st day August, 1995.

                                    GEODYNE PROPERTIES, INC.,
                                    as General Partner

                                    By:   /s/ Dennis R. Neill
                                          ------------------------------
                                          Dennis R. Neill
                                          Senior Vice President

                                    GEODYNE INSTITUTIONAL DEPOSITARY
                                    COMPANY, as the Limited Partner

                                    By:   /s/ Dennis R. Neill
                                          ------------------------------
                                          Dennis R. Neill
                                          Senior Vice President

                                    GEODYNE PROPERTIES, INC.
                                    as Attorney-in-Fact for all
                                    Substituted Limited Partners

                                    By:   /s/ Dennis R. Neill
                                          ------------------------------
                                          Drew S. Phillips
                                          Vice President-Controller

                                      -2-Fourth Amendment to
                       Agreement of Limited Partnership of
                 Geodyne Institutional/Pension Energy Income
                             Limited Partnership P-8

     This  Fourth  Amendment  to  Agreement  of Limited  Partnership  of Geodyne
Institutional/Pension  Energy Income Limited Partnership P-8 (the "Partnership")
is entered into by and between Geodyne Resources, Inc. ("Resources"), a Delaware
corporation,  as successor  General Partner,  Geodyne  Institutional  Depositary
Company ("Depositary"),  a Delaware corporation, as the Limited Partner, and all
Substituted Limited Partners admitted to the Partnership.

     WHEREAS, on February 28, 1992, Geodyne Properties, Inc. ("Properties"),  as
General partner, and Depositary executed and entered into that certain Agreement
and Certificate of Limited Partnership of the Partnership (the "Agreement"); and

     WHEREAS,  on February 25, 1993,  Properties  executed and entered into that
First  Amendment  to the  Agreement  whereby  it  changed  (i)  the  name of the
Partnership  from  "PaineWebber/Geodyne   Institutional/Pension   Energy  Income
Limited Partnership P-8" to "Geodyne Institutional/Pension Energy Income Limited
Partnership  P-8",  (ii) the  address of the  Partnership's  principal  place of
business,  and (iii) the  address  for the  Partnership's  agent for  service of
process; and

     WHEREAS,  on August 4, 1993,  Properties  executed  and  entered  into that
Second Amendment to the Agreement  whereby it amended certain  provisions to (i)
expedite  the  method  of  accepting  transfers  of Unit  Holders'  Units in the
Partnership  and (ii)  provide  for an optional  right of  repurchase/redemption
which may be exercised by the Unit Holders; and

     WHEREAS,  on August 31,  1995,  Properties  executed  and entered into that
Third Amendment to the Agreement whereby it amended certain  provisions to allow
transfers  of Units  facilitated  through a matching  service to the extent that
such  transfers   otherwise   comply  with  Internal  Revenue  Service  transfer
regulations  applicable  to  non-permitted  transfers  for  non-publicly  traded
limited partnerships; and

     WHEREAS, Section 11.1 of the Agreement provides that the general partner of
the partnership (the "General  Partner") may, without prior notice or consent of
any Unit  Holder (as  defined in the  Agreement),  amend any  provision  of this
Agreement if, in its opinion,  such amendment  does not have a material  adverse
effect upon the Unit Holders; and

     WHEREAS,   Properties  merged  with  and  into  Geodyne  Resources,  Inc.
("Resources"), its parent corporation, effective June 30, 1996; and

                                      -1-
<PAGE>

     WHEREAS, Section 6.2 of the Agreement provides that the General Partner may
assign its General  Partner  Interest to a Person which shall become a successor
General Partner without the Consent of the Depositary,  if such assignment is in
connection with a merger; and

     WHEREAS,  as a result of the merger of Properties  with and into Resources,
ownership  of the General  Partner  Interest in the  Partnership  is assigned to
Resources by operation of law; and

     WHEREAS,  as a result of the merger of Properties  with and into Resources,
Resources  has  now  succeeded  to  the  position  of  General  Partner  of  the
Partnership; and

     WHEREAS,  Resources, as General Partner,  desires to amend the Agreement in
order to reflect Resources as the new General Partner.

     NOW,  THEREFORE,   in  consideration  of  the  covenants,   conditions  and
agreements herein contained, the parties hereto hereby agree as follows:

       All references in the Agreement to Geodyne Properties,  Inc. as General
       Partner are hereby  amended to  reflect,  instead,  Geodyne  Resources,
       Inc. as General Partner.

       IN WITNESS  WHEREOF,  the parties hereto have hereunto set their hands as
of the 1st day of July, 1996.

                                       Geodyne Properties, Inc.
                                       by Geodyne Resources, Inc.
                                       as successor by merger

                                       By:  /s/ Dennis R. Neill
                                            ----------------------------
                                            Dennis R. Neill
                                            President

                                       Geodyne Resources, Inc.
                                       as General Partner

                                       By:  /s/ Dennis R. Neill
                                            ----------------------------
                                            Dennis R. Neill
                                            President

                                       Geodyne Depositary Company,
                                       as the  Limited Partner

                                       By:  /s/ Dennis R. Neill
                                            ----------------------------
                                            Dennis R. Neill
                                            President

                                      -2-
<PAGE>

                                       Geodyne Resources, Inc.,
                                       as Attorney-in-Fact for all
                                       Substituted Limited Partners

                                       By:  /s/ Dennis R. Neill
                                            ----------------------------
                                            Dennis R. Neill
                                            President

                                      -3-Fifth Amendment to
                       Agreement of Limited Partnership of
                 Geodyne Institutional/Pension Energy Income
                             Limited Partnership P-8

      This  Fifth  Amendment  to  Agreement  of Limited  Partnership  of Geodyne
Institutional/Pension  Energy Income Limited Partnership P-8 (the "Partnership")
is entered into by and between Geodyne Resources, Inc. ("Resources"), a Delaware
corporation,  as successor  General Partner,  Geodyne  Institutional  Depositary
Company ("Depositary"),  a Delaware corporation, as the Limited Partner, and all
Substituted Limited Partners admitted to the Partnership.

      WHEREAS, on February 28, 1992, Geodyne Properties, Inc. ("Properties"), as
General partner, and Depositary executed and entered into that certain Agreement
and Certificate of Limited Partnership of the Partnership (the "Agreement"); and

      WHEREAS,  on February 25, 1993,  Properties executed and entered into that
certain First Amendment to the Agreement  whereby it changed (i) the name of the
Partnership  from  "PaineWebber/Geodyne   Institutional/Pension   Energy  Income
Limited Partnership P-8" to "Geodyne Institutional/Pension Energy Income Limited
Partnership  P-8",  (ii) the  address of the  Partnership's  principal  place of
business,  and (iii) the  address  for the  Partnership's  agent for  service of
process; and

      WHEREAS,  on August 4, 1993,  Properties  executed  and entered  into that
certain Second Amendment to the Agreement whereby it amended certain  provisions
to (i) expedite the method of accepting  transfers of Unit Holders' Units in the
Partnership  and (ii)  provide  for an optional  right of  repurchase/redemption
which may be exercised by the Unit Holders; and

      WHEREAS,  on August 31,  1995,  Properties  executed and entered into that
certain Third Amendment to the Agreement  whereby it amended certain  provisions
to allow transfers of Units facilitated through a matching service to the extent
that such transfers  otherwise  comply with Internal  Revenue  Service  transfer
regulations  applicable  to  non-permitted  transfers  for  non-publicly  traded
limited partnerships; and

      WHEREAS,  Section 11.1 of the Agreement  provides that the general partner
of the partnership (the "General  Partner") may, without prior notice or consent
of any Unit Holder (as defined in the  Agreement),  amend any  provision of this
Agreement if, in its opinion,  such amendment  does not have a material  adverse
effect upon the Unit Holders; and

      WHEREAS,  Properties  merged  with  and  into  Geodyne  Resources,  Inc.
("Resources"), its parent corporation, effective June 30, 1996; and

<
                                      -1-
<PAGE>

      WHEREAS,  on  July  1st,  1996,  Resources  as  successor  via  merger  to
Properties  executed  and entered  into that  certain  Fourth  Amendment  to the
Agreement  whereby it amended the  Agreement to provide that Geodyne  Resources,
Inc., as successor  via merger with  Properties,  is the General  Partner of the
Partnership; and

      WHEREAS,  Section 2.3 of the Agreement provides that the Partnership shall
continue  in full  force and effect for a period of ten (10) years from the date
of its activation, or until February 28, 2002, provided that the General Partner
may extend the term of the  Partnership for up to five periods of two years each
if it  believes  each such  extension  is in the best  interests  of the Limited
Partners or until  dissolution  prior thereto  pursuant to the provisions of the
Agreement, and

      WHEREAS,  Resources  as General  Partner has elected to extend the life of
the Partnership an additional two years.

      Now,  Therefore,  in  consideration  of  the  covenants,   conditions  and
agreements herein contained, the parties hereto hereby agree as follows:

      Section 2.3. is hereby amended and restated as follows:

                  The  Partnership  shall  continue  in force and  effect  until
            February 28, 2004,  provided that the General Partner may extend the
            term of the  Partnership for up to four periods of two years each if
            it believes such  extension is in the best  interests of the Limited
            Partners,  or  until  dissolution  prior  thereto  pursuant  to  the
            provisions hereof.

      IN WITNESS WHEREOF, the parties hereto have hereunto set their hands as of
the 14th day of November, 2001.

                                       Geodyne Resources, Inc.
                                       as General Partner

                                       By:   /s/ Dennis R. Neill
                                             ---------------------------
                                                Dennis R. Neill
                                                President

                                       Geodyne Institutional Depositary
                                       Company, as the Limited Partner

                                       By: /s/ Dennis R. Neill
                                             ---------------------------
                                                Dennis R. Neill
                                                President

                                      -2-
<PAGE>

                                       Geodyne Resources, Inc.,
                                       as Attorney-in-Fact for all
                                       Substituted Limited Partners

                                       By: /s/ Dennis R. Neill
                                             ---------------------------
                                                Dennis R. Neill
                                                President

                                      -3-

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