Exhibit 99.1

PrimeEnergy Corporation

Estimated

Future Reserves

Attributable to Certain

Leasehold and Royalty Interests

SEC Parameters

As of

December 31, 2009



|                                                |  |                           
|----------------------------------------------- |  | --------------------------
|\s\ Michael F. Stell                            |  | \s\ Richard J. Marshall   
|Michael F. Stell, P.E.                          |  | Richard J. Marshall, P.E. 
|TBPE License No. 56416                          |  | Colorado License No. 23260
|Managing Senior Vice President                  |  | Vice President            
|                                               
|[SEAL] RYDER SCOTT COMPANY, L.P.        
[SEAL]
|TBPE Firm Registration No. F-1580              



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|                                                                                                       |  |                   
|------------------------------------------------------------------------------------------------------ |  | ------------------
|LOGO                                                                                                   |  | FAX (303) 623-4258
|                                                                                                      
|621 SEVENTEENTH STREET        SUITE 1550        DENVER, COLORADO
80293        TELEPHONE (303) 623-9147
|                                                                                                       | 
|                                                                                                       |  | April 14, 2010    

PrimeEnergy Corporation

One Landmark Square

Stamford, Connecticut 06901

Dear Ms. Beverly A. Cummings:

At your request, Ryder Scott Company (Ryder Scott) has prepared an estimate of the proved reserves, future production, and income attributable to certain leasehold and royalty interests of PrimeEnergy
Corporation and 100% of its Partnership Interests (PrimeEnergy) of December 31, 2009. The subject properties are located in the states of Colorado, Kansas, Louisiana, Montana, Mississippi, New Mexico, Oklahoma, Texas, West Virginia and
Wyoming and in the federal waters offshore Louisiana and Texas. The reserves and income data were estimated based on the definitions and disclosure guidelines of the United States Securities and Exchange Commission (SEC) contained in Title 17, Code
of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released January 14, 2009 in the Federal Register (SEC regulations). Our third party study was prepared for public disclosure by PrimeEnergy Corporation in filings made
with the SEC in accordance with the disclosure requirements set forth in the SEC regulations. The results of our third party study, completed on April 14, 2010, are presented herein. The properties reviewed by Ryder Scott represent 100 percent
of the total net proved liquid hydrocarbon reserves and 100 percent of the total net proved gas reserves of PrimeEnergy.

The
estimated reserves and future net income amounts presented in this report, as of December 31, 2009 are related to hydrocarbon prices. The hydrocarbon prices used in the preparation of this report are based on the average prices during the
12-month period prior to the ending date of the period covered in this report, determined as unweighted arithmetic averages of the prices in effect on the first-day-of-the-month for each month within such period, unless prices were defined by
contractual arrangements as required by the SEC regulations. Actual future prices may vary significantly from the prices required by SEC regulations; therefore, volumes of reserves actually recovered and the amounts of income actually received may
differ significantly from the estimated quantities presented in this report. The results of this study are summarized below.

SEC PARAMETERS

Estimated Net Reserves and Income Data

Certain Leasehold and Royalty Interests of

PrimeEnergy Corporation and 100% of Partnership Interests

As of December 31, 2009



|                         |  |           |             |  |               |   |            |                 |  |   |             |  |  |   |             |   |  |   |             | 
|------------------------ |  | --------- | ----------- |  | ------------- | - | ---------- | --------------- |  | - | ----------- |  |  | - | ----------- | - |  | - | ----------- | 
|                         |  | Proved    |            
|                         |  | Developed |             |  | Undeveloped   |   |            | OtherDeductions |  |   | TotalProved | 
|                         |  | Producing |             |  | Non-Producing |   |            |                 | 
|Net Remaining Reserves   |  |           |             |  |               |   |            |                 |  |   |             |  |  |   |             |   |  |   |             | 
|Oil/Condensate  Barrels |  |           | 4,308,355   |  |               |   | 167,753    |                 |  |   | 1,610,610   |  |  |   | 0           |   |  |   | 6,086,718   | 
|Gas  MMCF               |  |           | 34,535      |  |               |   | 3,854      |                 |  |   | 7,024       |  |  |   | 0           |   |  |   | 45,413      | 
|                         |  |           |             |  |              
|Income Data              |  |           |             |  |               |   |            |                 |  |   |             |  |  |   |             |   |  |   |             | 
|Future Gross Revenue     |  | $         | 393,720,162 |  |               | $ | 26,121,650 |                 |  | $ | 129,262,467 |  |  | $ | 0           |   |  | $ | 549,104,279 | 
|Deductions               |  |           | 209,756,495 |  |               |   | 14,717,314 |                 |  |   | 84,470,064  |  |  |   | 17,096,300  |   |  |   | 326,040,173 | 
|                         |  |           |             |  |               |   |            |                 |  |   |             |  |  |   |             |   |  |   |             | 
|Future Net Income (FNI)  |  | $         | 183,963,667 |  |               | $ | 11,404,336 |                 |  | $ | 44,792,403  |  |  | $ | (17,096,300 | ) |  | $ | 223,064,106 | 
|                         |  |           |             |  |              
|Discounted FNI @ 10%     |  | $         | 113,786,624 |  |               | $ | 5,373,309  |                 |  | $ | 10,388,346  |  |  | $ | (8,546,750  | ) |  | $ | 121,001,529 | 



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PrimeEnergy Corporation

April 14, 2010

Page 2



Liquid hydrocarbons are expressed in standard 42 gallon barrels. All gas volumes are
reported on an as sold basis expressed in millions of cubic feet (MMCF) at the official temperature and pressure bases of the areas in which the gas reserves are located.

The estimates of the reserves, future production, and income attributable to properties in this report were prepared using the economic
software package PHDWin Petroleum Economic Evaluation Software, a copyrighted program of TRC Consultants L.C. The program was used solely at the request of PrimeEnergy. Ryder Scott has found this program to be generally acceptable, but notes that
certain summaries and calculations may vary due to rounding and may not exactly match the sum of the properties being summarized. Furthermore, one line economic summaries may vary slightly from the more detailed cash flow projections of the same
properties, also due to rounding. The rounding differences are not material.

The future gross revenue is after the deduction
of production taxes. The deductions incorporate the normal direct costs of operating the wells, ad valorem taxes, recompletion costs, development costs, and certain abandonment costs net of salvage. The future net income is before the deduction of
state and federal income taxes and general administrative overhead, and has not been adjusted for outstanding loans that may exist, nor does it include any adjustment for cash on hand or undistributed income. Liquid hydrocarbon reserves account for
approximately 61 percent and gas reserves account for the remaining 39 percent of total future gross revenue from proved reserves.

The discounted future net income shown above was calculated using a discount rate of 10 percent per annum compounded monthly.

The results shown above are presented for your information and should not be construed as our estimate of fair marker value.

Reserves Included in This Report

The proved reserves included
herein conform to the definition as set forth in the Securities and Exchange Commissions Regulations Part 210.4-10(a). An abridged version of the SEC reserves definitions from 210.4-10(a) entitled Petroleum Reserves Definitions is
included as an attachment to this report.

The various proved reserve status categories are defined under the attachment
entitled Petroleum Reserves Definitions in this report. The proved developed non-producing reserves included herein consist of the shut in and behind pipe categories.

No attempt was made to quantify or otherwise account for any accumulated gas production imbalances that may exist. The proved gas volumes
included herein do not attribute gas consumed in operations as reserves.

Reserves are those estimated remaining quantities of
petroleum that are anticipated to be economically producible, as of a given date, from known accumulations under defined conditions. All reserve estimates involve an assessment of the uncertainty relating the likelihood that the actual remaining
quantities recovered will be greater or less than the estimated quantities determined as of the date the estimate is made. The uncertainty depends chiefly on the amount of reliable geologic and engineering data available at the time of the estimate
and the interpretation of these data. The relative degree of uncertainty may be conveyed by placing reserves into one of two principal classifications, either proved or unproved. Unproved reserves are less certain to be recovered than proved
reserves, and may be further sub-classified as probable and possible reserves to denote progressively increasing uncertainty in their recoverability. At PrimeEnergys request, this report addresses only the proved reserves attributable to the
properties evaluated herein.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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PrimeEnergy Corporation

April 14, 2010

Page 3



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. The proved reserves included herein were estimated using deterministic methods. If deterministic methods are used,
the SEC has defined reasonable certainty for proved reserves as a high degree of confidence that the quantities will be recovered.

Proved reserve estimates will generally be revised only as additional geologic or engineering data become available or as economic conditions change. For proved reserves, the SEC states that as
changes due to increased availability of geoscience (geological, geophysical, and geochemical), engineering, and economic data are made to the estimated ultimate recovery (EUR) with time, reasonably certain EUR is much more likely to increase or
remain constant than to decrease. Moreover, estimates of proved reserves may be revised as a result of future operations, effects of regulation by governmental agencies or geopolitical or economic risks. Therefore, the proved reserves included
in this report are estimates only and should not be construed as being exact quantities, and if recovered, the revenues therefrom, and the actual costs related thereto, could be more or less than the estimated amounts.

The estimates of proved reserves presented herein were based upon a detailed study of the properties in which PrimeEnergy owns an
interest; however, we have not made any field examination of the properties. No consideration was given in this report to potential environmental liabilities that may exist nor were any costs included for potential liabilities to restore and clean
up damages, if any, caused by past operating practices.

Estimates of Reserves

The estimation of reserves involves two distinct determinations. The first determination results in the estimation of the quantities of
recoverable oil and gas and the second determination results in the estimation of the uncertainty associated with those estimated quantities in accordance with the definitions set forth by the Securities and Exchange Commissions Regulations
Part 210.4-10(a). The process of estimating the quantities of recoverable oil and gas reserves relies on the use of certain generally accepted analytical procedures. These analytical procedures fall into three broad categories or methods:
(1) performance-based methods; (2) volumetric-based methods; and (3) analogy. These methods may be used singularly or in combination by the reserve evaluator in the process of estimating the quantities of reserves. Reserve evaluators
must select the method or combination of methods which in their professional judgment is most appropriate given the nature and amount of reliable geoscience and engineering data available at the time of the estimate, the established or anticipated
performance characteristics of the reservoir being evaluated and the stage of development or producing maturity of the property.

In many cases, the analysis of the available geoscience and engineering data and the subsequent interpretation of this data may indicate a range of possible outcomes in an estimate, irrespective of the
method selected by the evaluator. When a range in the quantity of reserves is identified, the evaluator must determine the uncertainty associated with the incremental quantities of the reserves. If the reserve quantities are estimated using the
deterministic incremental approach, the uncertainty for each discrete incremental quantity of the reserves is addressed by the reserve category assigned by the evaluator. Therefore, it is the categorization of reserve quantities as proved, probable
and/or possible that addresses the inherent uncertainty in the estimated quantities reported.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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PrimeEnergy Corporation

April 14, 2010

Page 4



For proved reserves, uncertainty is defined by the SEC as reasonable certainty wherein
the quantities actually recovered are much more likely than not to be achieved. The SEC states that probable reserves are those additional reserves that are less certain to be recovered than proved reserves but which, together with
proved reserves, are as likely as not to be recovered. The SEC states that possible reserves are those additional reserves that are less certain to be recovered than probable reserves and the total quantities ultimately recovered from a
project have a low probability of exceeding proved plus probable plus possible reserves. All quantities of reserves within the same reserve category must meet the SEC definitions as noted above.

Estimates of reserves quantities and their associated reserve categories may be revised in the future as additional geoscience or
engineering data become available. Furthermore, estimates of reserves quantities and their associated reserve categories may also be revised due to other factors such as changes in economic conditions, results of future operations, effects of
regulation by governmental agencies or geopolitical or economic risks as previously noted herein.

The proved reserves for the
properties included herein were estimated by performance methods, the volumetric method, analogy, or a combination of methods. Approximately 95 percent of the proved producing reserves attributable to producing wells and/or reservoirs were estimated
by performance methods. These performance methods include, but may not be limited to, decline curve analysis, and material balance which utilized extrapolations of historical production and pressure data available through December, 2009 in those
cases where such data were considered to be definitive. The data utilized in this analysis were supplied to Ryder Scott by PrimeEnergy or obtained from public data sources and were considered sufficient for the purpose thereof. Approximately five
percent of the proved producing reserves were estimated by the volumetric method, analogy, or a combination of methods. These methods were used where there were inadequate historical performance data to establish a definitive trend and where the use
of production performance data as a basis for the reserve estimates was considered to be inappropriate.

The proved
non-producing and undeveloped reserves included herein were estimated by the volumetric method or analogy. Approximately 82% of the proved non-producing and undeveloped reserves were estimated by analogy. Approximately 18% of the proved
non-producing and undeveloped reserves were estimated by the volumetric method. The volumetric analysis utilized pertinent well and seismic data supplied to Ryder Scott by PrimeEnergy Corporation that was available through December, 2009. The data
utilized from the well and seismic data incorporated into our volumetric analysis were considered sufficient for the purpose thereof.

To estimate economically recoverable proved oil and gas reserves and related future net cash flows, we consider many factors and assumptions including, but not limited to, the use of reservoir parameters
derived from geological, geophysical and engineering data that cannot be measured directly, economic criteria based on current costs and SEC pricing requirements, and forecasts of future production rates. Under the SEC regulations 210.4-10(a)(22)(v)
and (26), proved reserves must be anticipated to be economically producible from a given date forward based on existing economic conditions including the prices and costs at which economic producibility from a reservoir is to be determined. While it
may reasonably be anticipated that the future prices received for the sale of production and the operating costs and other costs relating to such production may increase or decrease from those under existing economic conditions, such changes were,
in accordance with rules adopted by the SEC, omitted from consideration in making this evaluation.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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PrimeEnergy Corporation

April 14, 2010

Page 5



PrimeEnergy has informed us that they have furnished us all of the material accounts,
records, geological and engineering data, and reports and other data required for this investigation. In preparing our forecast of future proved production and income, we have relied upon data furnished by PrimeEnergy with respect to property
interests owned, production and well tests from examined wells, normal direct costs of operating the wells or leases, ad valorem and production taxes, recompletion and development costs, abandonment costs after salvage, product prices based on the
SEC regulations, adjustments or differentials to product prices, geological structural and isochore maps, well logs, core analyses, and pressure measurements. Ryder Scott reviewed such factual data for its reasonableness; however, we have not
conducted an independent verification of the data furnished by PrimeEnergy. We consider the factual data used in this report appropriate and sufficient for the purpose of preparing the estimates of reserves and future net revenues herein.

In summary, we consider the assumptions, data, methods and analytical procedures used in this report appropriate for the
purpose hereof, and we have used all such methods and procedures that we consider necessary and appropriate to prepare the estimates of reserves herein. The proved reserves included herein were determined in conformance with the United States
Securities and Exchange Commission (SEC) Modernization of Oil and Gas Reporting; Final Rule, including all references to Regulation S-X and Regulation S-K, referred to herein collectively as the SEC Regulations. In our opinion, the
proved reserves presented in this report comply with the definitions, guidelines and disclosure requirements as required by the SEC regulations.

Future Production Rates

For wells currently on production, our
forecasts of future production rates are based on historical performance data. If no production decline trend has been established, future production rates were held constant, or adjusted for the effects of curtailment where appropriate, until a
decline in ability to produce was anticipated. An estimated rate of decline was then applied to depletion of the reserves. If a decline trend has been established, this trend was used as the basis for estimating future production rates.

Test data and other related information were used to estimate the anticipated initial production rates for those wells or locations that
are not currently producing. For reserves not yet on production, sales were estimated to commence at an anticipated date furnished by PrimeEnergy. Wells or locations that are not currently producing may start producing earlier or later than
anticipated in our estimates due to unforeseen factors causing a change in the timing to initiate production. Such factors may include delays due to weather, the availability of rigs, the sequence of drilling, completing and/or recompleting wells
and/or constraints set by regulatory bodies.

The future production rates from wells currently on production or wells or
locations that are not currently producing may be more or less than estimated because of changes including, but not limited to, reservoir performance, operating conditions related to surface facilities, compression and artificial lift, pipeline
capacity and/or operating conditions, producing market demand and/or allowables or other constraints set by regulatory bodies.

Hydrocarbon Prices

The hydrocarbon prices used herein are based on SEC price parameters using the average prices during the 12-month period prior to the
ending date of the period covered in this report, determined as the unweighted arithmetic averages of the prices in effect on the first-day-of-the-month for each month within such period, unless prices were defined by contractual arrangements. For
hydrocarbon products sold under contract, the contract prices, including fixed and determinable escalations, exclusive of inflation adjustments, were used until expiration of the contract. Upon contract expiration, the prices were adjusted to the
12-month unweighted arithmetic average as previously described.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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PrimeEnergy Corporation

April 14, 2010

Page 6



PrimeEnergy furnished us with the above mentioned average prices in effect on
December 31, 2009. These initial SEC hydrocarbon prices were determined using the 12-month average first-day-of-the-month benchmark prices appropriate to the geographic area where the hydrocarbons are sold. These benchmark prices are prior to
the adjustments for differentials as described herein. The table below summarizes the benchmark prices and price reference used for the geographic area(s) included in the report. In certain geographic areas, the price
reference and benchmark prices may be defined by contractual arrangements

The product prices that were actually used to
determine the future gross revenue for each property reflect adjustments to the benchmark prices for gravity, quality, local conditions, and gathering and transportation fees, and/or distance from market, referred to herein as
differentials. The differentials used in the preparation of this report were furnished to us by PrimeEnergy.

In
addition, the table below summarizes the net volume weighted benchmark prices adjusted for differentials and referred to herein as the average realized prices. The average realized prices shown in the table below were determined from the
total future gross revenue before production taxes and the total net reserves for the geographic area and presented in accordance with SEC disclosure requirements for each of the geographic areas included in the report.



|                |  |                |  |                                 |  |                        |            |  |                       |   |           | 
|--------------- |  | -------------- |  | ------------------------------- |  | ---------------------- | ---------- |  | --------------------- | - | --------- | 
|Geographic Area |  | Product        |  | Price
Reference                 |  | AverageBenchmarkPrices |            |  | AverageRealizedPrices |  
|North America   |  |                |  |                                 |  |                        |            |  |                       |   |           | 
|United States   |  | Oil/Condensate |  | WTI Cushing                     |  | $                      | 61.18/Bbl  |  |                       | $ | 57.96/Bbl | 
|                |  |                |  |                                
|                |  | Gas            |  | Henry Hub  Colorado Interstate |  | $                      | 3.87/MMBTU |  |                       | $ | 4.98/MCF  | 

The effects of
derivative instruments designated as price hedges of oil and gas quantities are not reflected in our individual property evaluations.

Costs

Operating
costs for the leases and wells in this report are based on the operating expense reports of PrimeEnergy and include only those costs directly applicable to the leases or wells. The operating costs include a portion of general and administrative
costs allocated directly to the leases and wells. For operated properties, the operating costs include an appropriate level of corporate general administrative and overhead costs. The operating costs for non-operated properties include the COPAS
overhead costs that are allocated directly to the leases and wells under terms of operating agreements. The operating costs furnished to us were accepted as factual data and reviewed by us for their reasonableness; however, we have not conducted an
independent verification of the operating cost data used by PrimeEnergy. No deduction was made for loan repayments, interest expenses, or exploration and development prepayments that were not charged directly to the leases or wells.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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PrimeEnergy Corporation

April 14, 2010

Page 7



Development costs were furnished to us by PrimeEnergy and are based on
authorizations for expenditure for the proposed work or actual costs for similar projects. The development costs furnished to us were accepted as factual data and reviewed by us for their reasonableness; however, we have not conducted an independent
verification of these costs. The estimated net cost of abandonment after salvage was included for properties where abandonment costs net of salvage were significant. The estimates of the net abandonment costs furnished by PrimeEnergy were accepted
without independent verification.

The proved non-producing and undeveloped reserves in this report have been
incorporated herein in accordance with PrimeEnergys plans to develop these reserves as of December 31, 2009. The implementation of PrimeEnergys development plans as presented to us and incorporated herein is subject to the approval
process adopted by PrimeEnergys management. As the result of our inquires during the course of preparing this report, PrimeEnergy has informed us that the development activities included herein have been subjected to and received the internal
approvals required by PrimeEnergys management at the appropriate local, regional and/or corporate level. In addition to the internal approvals as noted, certain development activities may still be subject to specific partner AFE processes,
Joint Operating Agreement (JOA) requirements or other administrative approvals external to PrimeEnergy. Additionally, PrimeEnergy has informed us that they are not aware of any legal, regulatory, political or economic obstacles that would
significantly alter their plans.

Current costs used by PrimeEnergy were held constant throughout the life of the properties.

Standards of Independence and Professional Qualification

Ryder Scott is an independent petroleum engineering consulting firm that has been providing petroleum consulting services throughout the
world for over seventy years. Ryder Scott is employee-owned and maintains offices in Houston, Texas; Denver, Colorado; and Calgary, Alberta, Canada. We have over eighty engineers and geoscientists on our permanent staff. By virtue of the size of our
firm and the large number of clients for which we provide services, no single client or job represents a material portion of our annual revenue. We do not serve as officers or directors of any publicly-traded oil and gas company and are separate and
independent from the operating and investment decision-making process of our clients. This allows us to bring the highest level of independence and objectivity to each engagement for our services.

Ryder Scott actively participates in industry-related professional societies and organizes an annual public forum focused on the subject
of reserves evaluations and SEC regulations. Many of our staff have authored or co-authored technical papers on the subject of reserves related topics. We encourage our staff to maintain and enhance their professional skills by actively
participating in ongoing continuing education.

Prior to becoming an officer of the Company, Ryder Scott requires that staff
engineers and geoscientists have received professional accreditation in the form of a registered or certified professional engineers license or a registered or certified professional geoscientists license, or the equivalent thereof, from
an appropriate governmental authority or a recognized self-regulating professional organization.

We are independent petroleum
engineers with respect to PrimeEnergy. Neither we nor any of our employees have any interest in the subject properties and neither the employment to do this work nor the compensation is contingent on our estimates of reserves for the properties
which were reviewed.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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PrimeEnergy Corporation

April 14, 2010

Page 8



The results of this study, presented herein, are based on technical analysis conducted
by teams of geoscientists and engineers from Ryder Scott. The professional qualifications of the undersigned, the technical persons primarily responsible for overseeing, reviewing and approving the evaluation of the reserves information discussed in
this report, are included as an attachment to this letter.

Terms of Usage

The results of our third party study, presented in report form herein, were prepared in accordance with the disclosure requirements set
forth in the SEC regulations and intended for public disclosure as an exhibit in filings made with the SEC by PrimeEnergy.

PrimeEnergy makes periodic filings on Form 10-K with the SEC under the 1934 Exchange Act. We have consented to the incorporation by
reference in the registration statements to references to our name as well as to the references to our third party report for PrimeEnergy, which appears in the December 31, 2009 annual report on Form 10-K of PrimeEnergy. Our written consent for
such use is included as a separate exhibit to the filings made with the SEC by PrimeEnergy.

We have provided PrimeEnergy with
a digital version of the original signed copy of this report letter. In the event there are any differences between the digital version included in filings made by PrimeEnergy and the original signed report letter, the original signed report letter
shall control and supersede the digital version.

The data and work papers used in the preparation of this report are
available for examination by authorized parties in our offices. Please contact us if we can be of further service.



Very truly yours,RYDER SCOTT COMPANY, L.P.TBPE Firm Registration No. F-1580/s/ Richard J. MarshallRichard J. Marshall, P.E.Colorado License No. 23260

[SEAL]Vice President/s/ Michael F. StellMichael F. Stell, P.E.TBPE License No. 56416

[SEAL]Managing Senior Vice President




|* | The work performed in this report for properties located in the state of Texas has been reviewed and approved by a licensed Texas professional engineer according to the
rules of the Texas Board of Professional Engineers (TBPE).
|- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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Professional Qualifications of Primary Technical Person

The conclusions presented in this report are the result of technical analysis conducted by teams of geoscientists and engineers from Ryder Scott Company,
L.P. Richard J. Marshall was the primary technical person responsible for overseeing the estimate of the future net reserves and income.

Marshall, an employee of Ryder Scott Company L.P. (Ryder Scott) beginning in 1981, is a Vice President responsible for coordinating and supervising staff
and consulting engineers of the company in ongoing reservoir evaluation studies. Before joining Ryder Scott, Marshall served in a number of engineering positions with Texaco, Phillips Petroleum, and others. For more information regarding
Mr. Marshalls geographic and job specific experience, please refer to the Ryder Scott Company website at www.ryderscott.com/Experience/Employees.

Marshall earned a B.S. in Geology from the University of Missouri in 1974 and a M.S. in Geological Engineering from the University of Missouri at Rolla in 1976. Marshall is a registered Professional
Engineer in the State of Colorado. He is a member of the Society of Petroleum Engineers, Wyoming Geological Association, Rocky Mountain Association of Geologists and the Society of Petroleum Evaluation Engineers.

Based on Marshalls educational background, professional training and more than 30 years of practical experience in the estimation and evaluation of
petroleum reserves, Marshall has attained the professional qualifications as a Reserves Estimator and Reserves Auditor as set forth in Article III of the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves
Information promulgated by the Society of Petroleum Engineers as of February 19, 2007.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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Professional Qualifications of Primary Technical Person

The conclusions presented in this report are the result of technical analysis conducted by teams of geoscientists and engineers from Ryder Scott Company,
L.P. Mr. Michael F. Stell was the primary technical person responsible for overseeing the estimate of the reserves, future production and income.

Mr. Stell, an employee of Ryder Scott Company L.P. (Ryder Scott) since 1992, is a Managing Senior Vice President and also serves as an Engineering Group Leader responsible for coordinating and
supervising staff and consulting engineers of the company in ongoing reservoir evaluation studies worldwide. Before joining Ryder Scott, Mr. Stell served in a number of engineering positions with Shell Oil Company and Landmark Concurrent
Solutions. For more information regarding Mr. Stells geographic and job specific experience, please refer to the Ryder Scott Company website at http://www.ryderscott.com/Experience/Employees.php.

Mr. Stell earned a Bachelor of Science degree in Chemical Engineering from Purdue University in 1979 and a Master of Science Degree in Chemical
Engineering from the University of California, Berkeley, in 1981. He is a registered Professional Engineer in the State of Texas. He is also a member of the Society of Petroleum Engineers and the Society of Petroleum Evaluation Engineers.

In addition to gaining experience and competency through prior work experience, the Texas Board of Professional Engineers requires a minimum
of 15 hours of continuing education annually, including at least one hour in the area of professional ethics, which Mr. Stell fulfills. As part of his 2009 continuing education hours, Mr. Stell attended an internally presented 13 hours of
formalized training as well as a day-long public forum relating to the definitions and disclosure guidelines contained in the United States Securities and Exchange Commission Title 17, Code of Federal Regulations, Modernization of Oil and Gas
Reporting, Final Rule released January 14, 2009 in the Federal Register. Mr. Stell attended an additional 15 hours of formalized in-house training as well as an additional five hours of formalized external training during 2009 covering
such topics as the SPE/WPC/AAPG/SPEE Petroleum Resources Management System, reservoir engineering, geoscience and petroleum economics evaluation methods, procedures and software and ethics for consultants.

Based on his educational background, professional training and almost 30 years of practical experience in the estimation and evaluation of petroleum
reserves, Mr. Stell has attained the professional qualifications for a Reserves Estimator and Reserves Auditor set forth in Article III of the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information
promulgated by the Society of Petroleum Engineers as of February 19, 2007.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS



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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

On January 14, 2009, the United States Securities and Exchange Commission (SEC) published the Modernization of Oil and Gas Reporting; Final Rule in the Federal Register of National
Archives and Records Administration (NARA). The Modernization of Oil and Gas Reporting; Final Rule includes revisions and additions to the definition section in Rule 4-10 of Regulation S-X, revisions and additions to the oil and gas
reporting requirements in Regulation S-K, and amends and codifies Industry Guide 2 in Regulation S-K. The Modernization of Oil and Gas Reporting; Final Rule, including all references to Regulation S-X and Regulation S-K, shall be
referred to herein collectively as the SEC Regulations. The SEC Regulations take effect for all filings made with the United States Securities and Exchange Commission as of December 31, 2009, or after January 1, 2010. Reference
should be made to the full text under Title 17, Code of Federal Regulations, Regulation S-X Part 210, Rule 4-10(a) for the complete definitions, as the following definitions, descriptions and explanations rely wholly or in part on excerpts from the
original document (direct passages excerpted from the aforementioned SEC document are denoted in italics herein).

Reserves
are those estimated remaining quantities of petroleum which are anticipated to be economically producible, as of a given date, from known accumulations under defined conditions. All reserve estimates involve some degree of uncertainty. The
uncertainty depends chiefly on the amount of reliable geologic and engineering data available at the time of the estimate and the interpretation of these data. The relative degree of uncertainty may be conveyed by placing reserves into one of two
principal classifications, either proved or unproved. Unproved reserves are less certain to be recovered than proved reserves and may be further sub-classified as probable and possible reserves to denote progressively increasing uncertainty in their
recoverability. Under the SEC Regulations as of December 31, 2009, or after January 1, 2010, a company may optionally disclose estimated quantities of probable or possible oil and gas reserves in documents publicly filed with the
Commission. The SEC Regulations continue to prohibit disclosure of estimates of oil and gas resources other than reserves and any estimated values of such resources in any document publicly filed with the Commission unless such information is
required to be disclosed in the document by foreign or state law as noted in §229.1202 Instruction to Item 1202.

Reserves estimates will generally be revised as additional geologic or engineering data become available or as economic conditions
change.

Reserves may be attributed to either natural energy or improved recovery methods. Improved recovery methods include
all methods for supplementing natural energy or altering natural forces in the reservoir to increase ultimate recovery. Examples of such methods are pressure maintenance, natural gas cycling, waterflooding, thermal methods, chemical flooding, and
the use of miscible and immiscible displacement fluids. Other improved recovery methods may be developed in the future as petroleum technology continues to evolve.



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Reserves may be attributed to either conventional or unconventional petroleum
accumulations. Petroleum accumulations are considered as either conventional or unconventional based on the nature of their in-place characteristics, extraction method applied, or degree of processing prior to sale. Examples of unconventional
petroleum accumulations include coalbed or coalseam methane (CBM/CSM), basin-centered gas, shale gas, gas hydrates, natural bitumen and oil shale deposits. These unconventional accumulations may require specialized extraction technology and/or
significant processing prior to sale.

Reserves do not include quantities of petroleum being held in inventory.

Because of the differences in uncertainty, caution should be exercised when aggregating quantities of petroleum from different reserves
categories.

RESERVES (SEC DEFINITIONS)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(26) defines reserves as follows:

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)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(22) defines proved oil and gas reserves as follows:

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



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(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.

PROVED RESERVES (SEC DEFINITIONS)
CONTINUED

(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.

(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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COMPANY PETROLEUM CONSULTANTS



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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)

Reserves status categories define the development and producing status of wells and reservoirs. Reference should be made to Title 17,
Code of Federal Regulations, Regulation S-X Part 210, Rule 4-10(a) and the SPE-PRMS as the following reserves status definitions are based on excerpts from the original documents (direct passages excerpted from the aforementioned SEC and SPE-PRMS
documents are denoted in italics herein).

DEVELOPED RESERVES (SEC DEFINITIONS)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(6) defines developed oil and gas reserves as follows:

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)

While not a requirement for disclosure under the SEC regulations, developed oil and gas reserves may be
further sub-classified according to the guidance contained in the SPE-PRMS as Producing or Non-Producing.

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.



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Developed Non-Producing

Developed Non-Producing Reserves include shut-in and behind-pipe reserves.

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)

Securities and Exchange
Commission Regulation S-X §210.4-10(a)(31) defines undeveloped oil and gas reserves as follows:

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.



RYDER SCOTT
COMPANY PETROLEUM CONSULTANTS