Exhibit 99.1

FORREST A. GARB & ASSOCIATES, INC.

INTERNATIONAL PETROLEUM CONSULTANTS

5310 HARVEST HILL ROAD, SUITE 275, LB 152

DALLAS, TEXAS 75230 - 5805

(972)788-1110    Telefax (972)991-3160    (E MAIL) forgarb@forgarb.com

February 28, 2011

Mr. Roe Buckley

Mewbourne Oil Company

3901 South Broadway

Tyler, Texas
75701

Re: SEC Filing Letter

Dear Mr. Buckley:

At your request, Forrest A. Garb & Associates,
Inc. (FGA) has estimated the proved reserves and future net revenue, as of January 1, 2011, attributable to interests owned by Mewbourne Energy Partnership 03A, L.P. (MEP03A) and managed by Mewbourne Development Corporation (MDC). It is our
understanding that the proved reserves in this report constitute 100 percent of all proved reserves owned by MEP03A. These reserves are associated with certain oil and gas properties located in New Mexico, Oklahoma, and Texas. This report has been
prepared for MEP03As filing with the U.S. Securities and Exchange Commission (SEC).

This report has been prepared using
the SECs definitions and guidelines, and with the exception of the exclusion of future income taxes, conforms to the FASB Accounting Standards Codification Topic 932, Extractive Industries  Oil and Gas. These guidelines specify the use
of a 12-month first-of-the-month average benchmark price, a 10 percent discount factor, and constant prices and costs.

The
following table summarizes the estimated net reserves and revenue as of January 1, 2011:



|                        |  |                          |        |  |                              |  |           |                   |  |  |                                 |  |  |  |           | 
|----------------------- |  | ------------------------ | ------ |  | ---------------------------- |  | --------- | ----------------- |  |  | ------------------------------- |  |  |  | --------- | 
|                        |  | Estimated Net
Reserves1  |        |  | Estimated Future Net Revenue | 
|Proved Reserve Category |  | Oil
andCondensate(MBbl)2 |        |  | Gas(MMcf)2                   |  |           | Undiscounted(M$)2 |  |  | Discounted at10% Per Year3(M$)2 | 
|Developed               |  |                          |        |  |                              |  |           |                   |  |  |                                 |  |  |  |           | 
|Producing               |  |                          | 21.696 |  |                              |  | 1,683.053 |                   |  |  | 4,404.594                       |  |  |  | 2,414.422 | 
|Non-producing           |  |                          | 32.006 |  |                              |  | 875.210   |                   |  |  | 4,168.823                       |  |  |  | 1,713.192 | 
|                        |  |                          |        |  |                              |  |           |                   |  |  |                                 |  |  |  |           | 
|Total Proved4           |  |                          | 53.702 |  |                              |  | 2,558.263 |                   |  |  | 8,573.417                       |  |  |  | 4,127.614 | 



|1 | The definitions
for all reserves incorporated in this study have been set forth immediately following this letter.
|- | ------------------------------------------------------------------------------------------------------------------

|2 | MBbl = thousands
of barrels, MMcf = millions of cubic feet, M$ = thousands of dollars.
|- | --------------------------------------------------------------------------------------

|3. | The discounted future net revenue is not represented to be the fair market value of these reserves.
|-- | ---------------------------------------------------------------------------------------------------

|4. | The reserves and revenues in the summary table were estimated using the Aries economics program. Due to the rounding procedures used in this program,
there may be slight differences in the calculated and summed values.
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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FORREST A. GARB & ASSOCIATES, INC.



ENGINEERING

Proved oil and gas reserves are those quantities of oil and gas which, by analysis of engineering and geoscience data, can be estimated with reasonable certainty to be economically producible from a given
date forward. The basis for estimating the proved producing reserves was the extrapolation of historical production having an established decline trend. Volumetrics and/or analogy were used for forecasting properties where insufficient data were
present for production decline extrapolation. Production histories were provided by MDC and checked using published production data and state reporting records. The reserves for other reserve categories were estimated by the volumetric method
considering well logs, core analyses, geologic maps, etc., and/or by analogy to adjacent comparable wells.

The analysis and
findings presented in this report, with the exceptions of parameters specified by others, represent FGAs informed judgments based on accepted standards of professional engineering practice, but are subject to the generally recognized and
unforeseen risks associated with the interpretation of geological, geophysical, and engineering data. Future changes in federal, state, or local regulations may adversely impact the ability to recover the future oil and gas volumes expected. Changes
in economic and market conditions from the assumptions and parameters used in this study may cause the total quantity of future oil or gas recovered, actual production rates, prices received, operating expenses and capital costs to vary from the
results presented in this report.

The available geologic and engineering data were furnished by MDC for FGAs review.
Gas volumes are expressed in millions of cubic feet (MMcf) at standard temperature and pressure. Gas sales imbalances have not been taken into account in the reserve estimates. The oil reserves shown in this study include crude oil and/or
condensate. Oil volumes are expressed in thousands of barrels (MBbl), with one barrel equivalent to 42 United States gallons.

ECONOMICS

The benchmark oil and gas prices used in this study are the average of the first trading-day-of-the-month spot prices
posted for West Texas Intermediate (WTI) oil and Henry Hub natural gas, per SEC guidelines. First trading-day-of-the-month prices for oil are from the U.S. Energy Information Administration. Gas prices are the NYMEX Natural Gas Henry Hub settlement
price for each respective month. Oil prices are based on a benchmark price of $79.79 per barrel and have been adjusted by lease for gravity, transportation fees, and regional price differentials. Gas prices per thousand cubic feet (Mcf) are based on
a benchmark price of $4.39 per million British thermal units (MMBtu) and have been adjusted by lease for Btu content, transportation fees, and regional price differentials.

Lease operating cost data were provided by MDC for FGAs review. The average lease operating costs and overhead costs for the prior 12 months, or for the months available, for each property were
utilized for this study. Capital expenditures are included as required for workovers, the future development of new wells, and for production equipment. All costs have been held constant in this evaluation. Existing or potential liabilities stemming
from environmental conditions caused by current or past operating practices have not been considered in this report. No costs are included in the projections of future net revenue or in our economic analyses to restore, repair, or improve the
environmental conditions of the properties studied to meet existing or future local, state, or federal regulations.



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The estimated future net revenues shown are those that should be realized from the sale
of estimated oil and gas reserves after deduction of severance taxes, ad valorem taxes, and direct operating costs. No deductions have been made for federal income taxes or other indirect costs, such as interest expense and loan repayments. Surface
and well equipment salvage values have not been considered in the revenue projections. The estimated reserves included in the cash flow projections have not been adjusted for risk. The reserves included in this study are estimates only and should
not be construed as exact quantities. Future conditions may affect recovery of estimated reserves and revenue, and all categories of reserves may be subject to revision as more performance data become available.

MDC provided ownership interest in the properties, and FGA accepted the extent and character of ownership (working interest and net
revenue interest) as represented. Our staff conducted no independent well tests, property inspections, or audits of completion and operating expenses as part of this study.

FGA is an independent firm of geologists and petroleum engineers. Neither the firm nor its employees own any interest in the properties studied, nor have we been employed on a contingency basis. FGA has
used all necessary methods and procedures in the preparation of this report for the evaluation of these properties.

This
letter was prepared under the supervision of W.D. Harris III, Registered Professional Engineer No. 75222, State of Texas, and is intended to be the same as the original report prepared for MDC.



|     |                                         |             
|---- | --------------------------------------- | ------------
|LOGO |                                         | Yours truly,
|     | LOGO                                   
|     | Forrest A. Garb & Associates, Inc.     
|     | Texas Registered Engineering Firm F-629
|     | LOGO                                   
|     | W. D. Harris III                       
|     | Chief Executive Officer                
|     | Forrest A. Garb & Associates, Inc.     

WDH/brm



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GENERAL COMMENTS



|(1) | The reserve estimates presented in this report have been calculated using deterministic procedures. The reserves shown in this report are those estimated to be
recoverable under the guidelines of the Securities and Exchange Commission (SEC). The definition for proved oil and gas reserves in accordance with SEC Regulation S-X are set forth in this report.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(2) | The estimated future net revenue shown in the cash flow projections is that revenue which should be realized from the sale of the estimated net reserves. Surface and
well equipment salvage values have not been considered in the revenue projections. Future net revenue as stated in this report is before the deduction of federal income tax.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(3) | The discounted future net revenue is not represented to be the fair market value of these reserves. The estimated reserves included in the cash flow projections have
not been adjusted for risk.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(4) | The reserves included in this study are estimates only and should not be construed as exact quantities. Future conditions may affect recovery of estimated reserves and
revenue, and all categories of reserves may be subject to revision as more performance data become available.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(5) | Extent and character of ownership, oil and gas prices, production data, direct operating costs, required capital expenditures, and other data furnished have been
accepted as represented. No independent well tests, property inspections, or audits of operating expenses were conducted by our staff in conjunction with this study.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(6) | If investments or business decisions are to be made in reliance on these estimates by anyone other than our client, such a person, with the approval of our client, is
invited to visit our offices at his own expense so that he can evaluate the assumptions made and the completeness and extent of the data available on which our estimates are based.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(7) | Gas contract differences, including take or pay claims, are not considered in this report.
|--- | ------------------------------------------------------------------------------------------



|(8) | Gas sales imbalances have not been taken into account in the reserve estimates.
|--- | -------------------------------------------------------------------------------



|(9) | Unless otherwise stated in the text, existing or potential liabilities stemming from environmental conditions caused by current or past operating practices have not
been considered in this report. No costs are included in the projections of future net revenue or in our economic analyses to restore, repair, or improve the environmental conditions of the properties studied to meet existing or future local, state,
or federal regulations.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(10) | Any distribution of this report or any part thereof must include these general comments and the cover letter in their entirety.
|---- | -------------------------------------------------------------------------------------------------------------------------------



|(11) | This report was prepared under the supervision of W.D. Harris III, Registered Professional Engineer No. 75222, State of Texas.
|---- | ------------------------------------------------------------------------------------------------------------------------------



General
Comments - 1



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FORREST A. GARB & ASSOCIATES, INC.



DEFINITIONS FOR OIL AND GAS RESERVES**

(1) Acquisition of properties.Costs incurred to purchase, lease or otherwise acquire a property, including costs of lease bonuses and options to
purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers fees, recording fees, legal costs, and other costs incurred in acquiring properties.

(2) Analogous reservoir.Analogous reservoirs, as used in resources assessments, have similar rock and fluid properties, reservoir conditions
(depth, temperature, and pressure) and drive mechanisms, but are typically at a more advanced stage of development than the reservoir of interest and thus may provide concepts to assist in the interpretation of more limited data and estimation of
recovery. When used to support proved reserves, an analogous reservoir refers to a reservoir that shares the following characteristics with the reservoir of interest:

(i) Same geological formation (but not necessarily in pressure communication with the reservoir of interest);

(ii) Same environment of deposition;

(iii) Similar geological structure; and

(iv) Same drive mechanism.

(3) Bitumen.Bitumen, sometimes referred to as natural bitumen, is petroleum in a solid or semi-solid state in natural deposits with a
viscosity greater than 10,000 centipoise measured at original temperature in the deposit and atmospheric pressure, on a gas free basis. In its natural state it usually contains sulfur, metals, and other non-hydrocarbons.

(4) Condensate.Condensate is a mixture of hydrocarbons that exists in the gaseous phase at original reservoir temperature and pressure, but that,
when produced, is in the liquid phase at surface pressure and temperature.

(5) Deterministic estimate.The method of estimating
reserves or resources is called deterministic when a single value for each parameter (from the geoscience, engineering, or economic data) in the reserves calculation is used in the reserves estimation procedure.

(6) Developed oil and gas reserves.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.



|* | These Reserves Definitions are those included in the Securities and Exchange Commission Regulation S-X as of January 1, 2010.
|- | -----------------------------------------------------------------------------------------------------------------------------



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(7) Development costs.Costs incurred to obtain access to proved reserves and to provide
facilities for extracting, treating, gathering and storing the oil and gas. More specifically, development costs, including depreciation and applicable operating costs of support equipment and facilities and other costs of development activities,
are costs incurred to:

(i) Gain access to and prepare well locations for drilling, including surveying well locations for the
purpose of determining specific development drilling sites, clearing ground, draining, road building, and relocating public roads, gas lines, and power lines, to the extent necessary in developing the proved reserves.

(ii) Drill and equip development wells, development-type stratigraphic test wells, and service wells, including the costs of platforms and
of well equipment such as casing, tubing, pumping equipment, and the wellhead assembly.

(iii) Acquire, construct, and install
production facilities such as lease flow lines, separators, treaters, heaters, manifolds, measuring devices, and production storage tanks, natural gas cycling and processing plants, and central utility and waste disposal systems.

(iv) Provide improved recovery systems.

(8) Development project.A development project is the means by which petroleum resources are brought to the status of economically producible. As examples, the development of a single reservoir or
field, an incremental development in a producing field, or the integrated development of a group of several fields and associated facilities with a common ownership may constitute a development project.

(9) Development well.A well drilled within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be
productive.

(10) Economically producible.The term economically producible, as it relates to a resource, means a resource which
generates revenue that exceeds, or is reasonably expected to exceed, the costs of the operation. The value of the products that generate revenue shall be determined at the terminal point of oil and gas producing activities as defined in paragraph
(a)(16) of this section.

(11) Estimated ultimate recovery (EUR).Estimated ultimate recovery is the sum of reserves remaining as of a
given date and cumulative production as of that date.

(12) Exploration costs.Costs incurred in identifying areas that may warrant
examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both
before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and
facilities and other costs of exploration activities, are:

(i) Costs of topographical, geographical and geophysical studies,
rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or G&Gcosts.



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(ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad
valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records.

(iii) Dry hole
contributions and bottom hole contributions.

(iv) Costs of drilling and equipping exploratory wells.

(v) Costs of drilling exploratory-type stratigraphic test wells.

(13) Exploratory well.An exploratory well is a well drilled to find a new field or to find a new reservoir in a field previously found to be productive of oil or gas in another reservoir.
Generally, an exploratory well is any well that is not a development well, an extension well, a service well, or a stratigraphic test well as those items are defined in this section.

(14) Extension well.An extension well is a well drilled to extend the limits of a known reservoir.

(15) Field.An area consisting of a single reservoir or multiple reservoirs all grouped on or related to the same individual geological structural feature and/or stratigraphic condition. There may
be two or more reservoirs in a field that are separated vertically by intervening impervious, strata, or laterally by local geologic barriers, or by both. Reservoirs that are associated by being in overlapping or adjacent fields may be treated as a
single or common operational field. The geological terms structural featureand stratigraphic conditionare intended to identify localized geological features as opposed to the broader terms of basins, trends, provinces, plays,
areas-of-interest, etc.

(16) Oil and gas producing activities.(i) Oil and gas producing activities include:

(A) The search for crude oil, including condensate and natural gas liquids, or natural gas (oil and gas) in their natural
states and original locations;

(B) The acquisition of property rights or properties for the purpose of further exploration or
for the purpose of removing the oil or gas from such properties;

(C) The construction, drilling, and production activities
necessary to retrieve oil and gas from their natural reservoirs, including the acquisition, construction, installation, and maintenance of field gathering and storage systems, such as:



| | (1) | Lifting the oil and gas to the surface; and
| | --- | -------------------------------------------



| | (2) | Gathering, treating, and field processing (as in the case of processing gas to extract liquid hydrocarbons); and
| | --- | ----------------------------------------------------------------------------------------------------------------

(D) Extraction of saleable hydrocarbons, in the solid, liquid, or gaseous state, from oil sands, shale, coalbeds, or other nonrenewable
natural resources which are intended to be upgraded into synthetic oil or gas, and activities undertaken with a view to such extraction.



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(17) Possible reserves.Possible reserves are those additional reserves that are less certain to
be recovered than probable reserves.

(i) When deterministic methods are used, the total quantities ultimately recovered from a
project have a low probability of exceeding proved plus probable plus possible reserves. When probabilistic methods are used, there should be at least a 10% probability that the total quantities ultimately recovered will equal or exceed the proved
plus probable plus possible reserves estimates.

(ii) Possible reserves may be assigned to areas of a reservoir adjacent to
probable reserves where data control and interpretations of available data are progressively less certain. Frequently, this will be in areas where geoscience and engineering data are unable to define clearly the area and vertical limits of
commercial production from the reservoir by a defined project.

(iii) Possible reserves also include incremental quantities
associated with a greater percentage recovery of the hydrocarbons in place than the recovery quantities assumed for probable reserves.

(iv) The proved plus probable and proved plus probable plus possible reserves estimates must be based on reasonable alternative technical and commercial interpretations within the reservoir or subject
project that are clearly documented, including comparisons to results in successful similar projects.

(v) Possible reserves
may be assigned where geoscience and engineering data identify directly adjacent portions of a reservoir within the same accumulation that may be separated from proved areas by faults with displacement less than formation thickness or other
geological discontinuities and that have not been penetrated by a wellbore, and the registrant believes that such adjacent portions are in communication with the known (proved) reservoir. Possible reserves may be assigned to areas that are
structurally higher or lower than the proved area if these areas are in communication with the proved reservoir.

(vi) Pursuant
to paragraph (a)(22)(iii) of this section, where direct observation has defined a highest known oil (HKO) elevation and the potential exists for an associated gas cap, proved oil reserves should be assigned in the structurally higher portions of the
reservoir above the HKO only if the higher contact can be established with reasonable certainty through reliable technology. Portions of the reservoir that do not meet this reasonable certainty criterion may be assigned as probable and possible oil
or gas based on reservoir fluid properties and pressure gradient interpretations.

(18) Probable reserves.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.

(i) When deterministic methods are used, it is as likely as not that actual remaining quantities recovered will exceed the sum of estimated proved plus probable reserves. When probabilistic methods are
used, there should be at least a 50% probability that the actual quantities recovered will equal or exceed the proved plus probable reserves estimates.



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(ii) Probable reserves may be assigned to areas of a reservoir adjacent to proved
reserves where data control or interpretations of available data are less certain, even if the interpreted reservoir continuity of structure or productivity does not meet the reasonable certainty criterion. Probable reserves may be assigned to areas
that are structurally higher than the proved area if these areas are in communication with the proved reservoir.

(iii)
Probable reserves estimates also include potential incremental quantities associated with a greater percentage recovery of the hydrocarbons in place than assumed for proved reserves.

(iv) See also guidelines in paragraphs (a)(17)(iv) and (a)(17)(vi) of this section.

(19) Probabilistic estimate.The method of estimation of reserves or resources is called probabilistic when the full range of values that could
reasonably occur for each unknown parameter (from the geoscience and engineering data) is used to generate a full range of possible outcomes and their associated probabilities of occurrence.

(20) Production costs.(i) Costs incurred to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and
facilities and other costs of operating and maintaining those wells and related equipment and facilities. They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are:

(A) Costs of labor to operate the wells and related equipment and facilities.

(B) Repairs and maintenance.

(C) Materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities.

(D) Property taxes and insurance applicable to proved properties and wells and related equipment and facilities.

(E) Severance taxes.

(ii) Some support equipment or facilities may serve two or more oil and gas
producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs
become exploration, development or production costs, as appropriate. Depreciation, depletion, and amortization of capitalized acquisition, exploration, and development costs are not production costs but also become part of the cost of oil and gas
produced along with production (lifting) costs identified above.

(21) Proved area.The part of a property to which proved reserves
have been specifically attributed.



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(22) 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.

(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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FORREST A. GARB & ASSOCIATES, INC.



(23) Proved properties.Properties with proved reserves.

(24) Reasonable certainty.If deterministic methods are used, reasonable certainty means a high degree of confidence that the quantities will be
recovered. If probabilistic methods are used, there should be at least a 90% probability that the quantities actually recovered will equal or exceed the estimate. A high degree of confidence exists if the quantity is much more likely to be achieved
than not, and, as changes due to increased availability of geoscience (geological, geophysical, and geochemical), engineering, and economic data are made to estimated ultimate recovery (EUR) with time, reasonably certain EUR is much more likely to
increase or remain constant than to decrease.

(25) Reliable technology.Reliable technology is a grouping of one or more technologies
(including computational methods) that has been field tested and has been demonstrated to provide reasonably certain results with consistency and repeatability in the formation being evaluated or in an analogous formation.

(26) 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).

(27) Reservoir.A porous and permeable underground formation containing a natural accumulation of producible oil and/or gas that is confined by impermeable rock or water barriers and is individual
and separate from other reservoirs.

(28) Resources.Resources are quantities of oil and gas estimated to exist in naturally occurring
accumulations. A portion of the resources may be estimated to be recoverable, and another portion may be considered to be unrecoverable. Resources include both discovered and undiscovered accumulations.

(29) Service well.A well drilled or completed for the purpose of supporting production in an existing field. Specific purposes of service wells
include gas injection, water injection, steam injection, air injection, salt-water disposal, water supply for injection, observation, or injection for in-situ combustion.

(30) Stratigraphic test well.A stratigraphic test well is a drilling effort, geologically directed, to obtain information pertaining to a specific geologic condition. Such wells customarily are
drilled without the intent of being completed for hydrocarbon production. The classification also includes tests identified as core tests and all types of expendable holes related to hydrocarbon exploration. Stratigraphic tests are classified as
exploratory type if not drilled in a known area or development type if drilled in a known area.



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(31) Undeveloped oil and gas reserves.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.

(32) Unproved properties.Properties with no proved reserves.



Definition
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