MARINER ENERGY, INC.
 Estimated
 Future Reserves and Income
 Attributable to Certain
 Leasehold and Royalty Interests
 SEC Parameters
 As of
 December 31, 2009
 
 (STAMP)
 RYDER SCOTT COMPANY, L.P.




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(RS LOGO)TBPE REGISTERED ENGINEERING FIRM F-1580
    
    
    
    FAX (713) 651-08491100 LOUISIANA SUITE 3800
    
    HOUSTON, TEXAS 77002-5218
    
    TELEPHONE (713) 651-9191
  
    SEC PARAMETERS    Mariner Energy, Inc.
 
 ProvedDeveloped
    
    
    
    
    
    
    TotalProducing
    
    
    Non-Producing
    
    
    Undeveloped
    
    
    ProvedNet Remaining ReservesOil/Condensate  Barrels
    
    
    22,182,961
    
    
    
    9,280,305
    
    
    
    21,001,842
    
    
    
    52,465,108Plant Products  Barrels
    
    
    17,429,676
    
    
    
    2,694,628
    
    
    
    13,360,078
    
    
    
    33,484,382Gas  MMCF
    
    
    263,841
    
    
    
    143,004
    
    
    
    164,591
    
    
    
    571,436Income DataFuture Gross Revenue
    
    $
    2,648,174,750
    
    
    $
    1,132,664,329
    
    
    $
    2,122,729,000
    
    
    $
    5,903,568,079Deductions
    
    
    1,207,597,398
    
    
    
    558,057,336
    
    
    
    1,463,012,375
    
    
    
    3,228,667,109Future Net Income (FNI)
    
    $
    1,440,577,352
    
    
    $
    574,606,993
    
    
    $
    659,716,625
    
    
    $
    2,674,900,970Discounted FNI @ 10%
    
    $
    900,920,312
    
    
    $
    449,118,773
    
    
    $
    152,155,094
    
    
    $
    1,502,194,179
 1200, 530 8TH AVENUE, S.W.
    
    CALGARY, ALBERTA T2P 3S8
    
    TEL (403) 262-2799
    
    FAX (403) 262-2790621 17TH STREET, SUITE 1550
    
    DENVER, COLORADO 80293-1501
    
    TEL (303) 623-9147
    
    FAX (303) 623-4258




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TM
   Discounted Future Net IncomeAs of December 31, 2009Discount Rate
    
    TotalPercent
    
    Proved5
    
    $
    1,901,758,80015
    
    $
    1,255,362,90020
    
    $
    1,084,799,10025
    
    $
    958,346,600
  Reserves Included in This Report




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Estimates of Reserves




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Future Production Rates
   Hydrocarbon Prices




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Costs
   .
 Current costs used by Mariner were held constant throughout the life of the properties.
 Standards of Independence and Professional Qualification




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Terms of Usage
  Very truly yours,RYDER SCOTT COMPANY, L.P.
TBPE Firm Registration No. F-1580/s/ Edward J. GibbonEdward J. Gibbon, P.E.TBPE  License No. 52750 
Senior
Vice President EJG/sm
    
    (STAMP)




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Professional Qualifications of Primary Technical Person
  http://www.ryderscott.com/Experience/Employees.php.




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PETROLEUM RESERVES DEFINITIONS
 As Adapted From:
RULE 4-10(a) of REGULATION S-X PART 210
UNITED STATES SECURITIES AND EXCHANGE COMMISSION (SEC)
 PREAMBLE




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RESERVES (SEC DEFINITIONS)
  Reserves. Reserves are estimated remaining quantities of oil and gas and related substances
anticipated to be economically producible, as of a given date, by application of development
projects to known accumulations. In addition, there must exist, or there must be a reasonable
expectation that there will exist, the legal right to produce or a revenue interest in the
production, installed means of delivering oil and gas or related substances to market, and all
permits and financing required to implement the project.
 Note to paragraph (a)(26): Reserves should not be assigned to adjacent reservoirs isolated by
major, potentially sealing, faults until those reservoirs are penetrated and evaluated as
economically producible. Reserves should not be assigned to areas that are clearly separated from
a known accumulation by a non-productive reservoir (i.e., absence of reservoir, structurally low
reservoir, or negative test results). Such areas may contain prospective resources (i.e.,
potentially recoverable resources from undiscovered accumulations).
 PROVED RESERVES (SEC DEFINITIONS)
  Proved oil and gas reserves. Proved oil and gas reserves are those quantities of oil and gas,
which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty
to be economically produciblefrom a given date forward, from known reservoirs, and under existing
economic conditions, operating methods, and government regulationsprior to the time at which
contracts providing the right to operate expire, unless evidence indicates that renewal is
reasonably certain, regardless of whether deterministic or probabilistic methods are used for the
estimation. The project to extract the hydrocarbons must have commenced or the operator must be
reasonably certain that it will commence the project within a reasonable time.
 (i) The area of the reservoir considered as proved includes:
 (A) The area identified by drilling and limited by fluid contacts, if any, and
 (B) Adjacent undrilled portions of the reservoir that can, with reasonable
certainty, be judged to be continuous with it and to contain economically
producible oil or gas on the basis of available geoscience and engineering data.
 (ii) In the absence of data on fluid contacts, proved quantities in a reservoir are limited
by the lowest known hydrocarbons (LKH) as seen in a well penetration
unless geoscience, engineering, or performance data and reliable technology establishes a
lower contact with reasonable certainty.
 (iii) Where direct observation from well penetrations has defined a highest known oil (HKO)
elevation and the potential exists for an associated gas cap, proved oil reserves may be
assigned in the structurally higher portions of the reservoir only if geoscience,
engineering, or performance data and reliable technology establish the higher contact with
reasonable certainty.




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(iv) Reserves which can be produced economically through application of improved
recovery techniques (including, but not limited to, fluid injection) are included in the
proved classification when:
 (A) Successful testing by a pilot project in an area of the reservoir with properties no
more favorable than in the reservoir as a whole, the operation of an installed program in
the reservoir or an analogous reservoir, or other evidence using reliable technology
establishes the reasonable certainty of the engineering analysis on which the project or
program was based; and
 (B) The project has been approved for development by all necessary parties and
entities, including governmental entities.
 (v) Existing economic conditions include prices and costs at which economic producibility
from a reservoir is to be determined. The price shall be the average price during the
12-month period prior to the ending date of the period covered by the report, determined as
an unweighted arithmetic average of the first-day-of-the-month price for each month within
such period, unless prices are defined by contractual arrangements, excluding escalations
based upon future conditions.




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RESERVES STATUS DEFINITIONS AND GUIDELINES
 As Adapted From:
RULE 4-10(a) of REGULATION S-X PART 210
UNITED STATES SECURITIES AND EXCHANGE COMMISSION (SEC)
 and
 PETROLEUM RESOURCES MANAGEMENT SYSTEM (SPE-PRMS)
Sponsored and Approved by:
SOCIETY OF PETROLEUM ENGINEERS (SPE),
WORLD PETROLEUM COUNCIL (WPC)
AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS (AAPG)
SOCIETY OF PETROLEUM EVALUATION ENGINEERS (SPEE)
  DEVELOPED RESERVES (SEC DEFINITIONS)
  Developed oil and gas reserves are reserves of any category that can be expected to be
recovered:
 (i) Through existing wells with existing equipment and operating methods or in
which the cost of the required equipment is relatively minor compared to the cost
of a new well; and
 (ii) Through installed extraction equipment and infrastructure operational at the
time of the reserves estimate if the extraction is by means not involving a well.
 Developed Producing (SPE-PRMS Definitions)
  Developed Producing Reserves
 Developed Producing Reserves are expected to be recovered from completion intervals that
are open and producing at the time of the estimate.
 Improved recovery reserves are considered producing only after the improved recovery
project is in operation.
 Developed Non-Producing
 Developed Non-Producing Reserves include shut-in and behind-pipe reserves.




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Shut-In
 Shut-in Reserves are expected to be recovered from:
 (1)
    
    completion intervals which are open at the time of the estimate but which have not
yet started producing;(2)
    
    wells which were shut-in for market conditions or pipeline
connections; or(3)
    
    wells not capable of production for mechanical reasons.
 Behind-Pipe
 Behind-pipe Reserves are expected to be recovered from zones in existing wells which will
require additional completion work or future re-completion prior to start of production.
 In all cases, production can be initiated or restored with relatively low expenditure
compared to the cost of drilling a new well.
 UNDEVELOPED RESERVES (SEC DEFINITIONS)
  Undeveloped oil and gas reserves are reserves of any category that are expected to be
recovered from new wells on undrilled acreage, or from existing wells where a relatively
major expenditure is required for recompletion.
 (i) Reserves on undrilled acreage shall be limited to those directly offsetting
development spacing areas that are reasonably certain of production when drilled,
unless evidence using reliable technology exists that establishes reasonable
certainty of economic producibility at greater distances.
 (ii) Undrilled locations can be classified as having undeveloped reserves only if a
development plan has been adopted indicating that they are scheduled to be drilled
within five years, unless the specific circumstances, justify a longer time.
 (iii) Under no circumstances shall estimates for undeveloped reserves be
attributable to any acreage for which an application of fluid injection or other
improved recovery technique is contemplated, unless such techniques have been
proved effective by actual projects in the same reservoir or an analogous
reservoir, as defined in paragraph (a)(2) of this section, or by other evidence
using reliable technology establishing reasonable certainty.