EX-99.4 11 a6302016engrptexhibit994.htm EXHIBIT 99.4
Exhibit 99.4
DeGolyer and MacNaughton
5001 Spring Valley Road
Suite 800 East
Dallas, Texas 75244
August 25, 2016
Evolution Petroleum Corporation
1155 Dairy Ashford, #425
Houston, Texas 77079
Ladies and Gentlemen:
Pursuant to your request, we have prepared estimates of the extent and value of the net proved, probable, and possible oil, condensate, natural gas liquids (NGL), and gas reserves, as of June 30, 2016, of certain properties in which Evolution Petroleum Corporation (Evolution) has represented that it owns an interest. This evaluation was completed on August 25, 2016. The properties evaluated consist of working and royalty interests located in the Delhi field in Richland Parish, Louisiana. Evolution has represented that these properties account for 100 percent of its proved reserves as of June 30, 2016. The net proved reserves estimates prepared by us have been prepared in accordance with the reserves definitions of Rules 4-10 (a) (1)-(32) of Regulation S-X of the United States Securities and Exchange Commission (SEC). This report was prepared in accordance with the guidelines specified in Item 1202 (a) (8) of Regulation S-K, and is to be used for inclusion in certain SEC filings by Evolution.
Estimates of reserves included herein are expressed as net reserves. Gross reserves are defined as the total estimated petroleum to be produced from these properties after June 30, 2016. Net reserves are defined as that portion of the gross reserves attributable to the interests owned by Evolution after deducting all royalties and interests owned by others.
Values of proved, probable, and possible reserves in this report are expressed in terms of estimated future gross revenue, future net revenue, and present worth. Future gross revenue is that revenue which will accrue to the evaluated interests from the production and sale of the estimated net reserves. Future net revenue is calculated by deducting production and ad valorem taxes, operating expenses, and

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capital and abandonment costs from the future gross revenue. Operating expenses include field operating expenses, carbon dioxide purchase expenses, transportation expenses, compression charges, and an allocation of overhead that directly relates to production activities. Future income tax expenses were not taken into account in the preparation of these estimates. Present worth is defined as future net revenue discounted at 10 percent compounded annually over the expected period of realization. Present worth should not be construed as fair market value because no consideration was given to additional factors that influence the prices at which properties are bought and sold.
Estimates of oil, condensate, NGL and gas reserves and future net revenue should be regarded only as estimates that may change as further production history and additional information become available. Not only are such reserves and revenue estimates based on that information which is currently available, but such estimates are also subject to the uncertainties inherent in the application of judgmental factors in interpreting such information.
Data used in this report were obtained from Evolution, from records on file with the appropriate regulatory agencies, and from public sources. In the preparation of this report we have relied, without independent verification, upon such information furnished by Evolution with respect to property interests evaluated, production from such properties, current costs of operation and development, current prices for production, agreements relating to current and future operations and sale of production, and various other information and data that were accepted as represented. It was not considered necessary to make a field examination of the physical condition and operation of the properties.
Methodology and Procedures
Estimates of reserves were prepared by the use of appropriate geologic, petroleum engineering, and evaluation principles and techniques that are in accordance with practices generally recognized by the petroleum industry as presented in the publication of the Society of Petroleum Engineers entitled "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information (Revision as of February 19, 2007)." The method or combination of methods used in the analysis was tempered by experience with similar reservoirs, stage of development, quality and completeness of basic data, and production history.
Based on the current stage of field development, production performance, the

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development plans provided by Evolution, and the analyses of areas offsetting existing wells with test or production data, reserves were classified as proved, probable, or possible.
Most of the proved, probable, and possible reserves estimated for the evaluated interests are located in the Holt-Bryant reservoir in the Delhi field. This reservoir was originally discovered in 1944, produced under primary means until unitized for water injection in 1953, and was purchased by Denbury Resources (Denbury) in 2006 in order to initiate a carbon dioxide injection program. Average depth is 3,235 feet subsea The Delhi unit is 13,636 acres, and the unit area is approximately 6,189 acres. Denbury began carbon dioxide injection in 3 patterns in November 2009 and has since expanded to 15 patterns, which have all seen production response to injection. Evolution owns working and overriding royalty interests in the unit.
The volumetric method was used to estimate the original oil in place (OOIP). Structure maps were utilized to delineate each reservoir, and isopach maps were utilized to estimate reservoir volume. Electrical logs, radioactivity logs, core analyses, and other available data were used to prepare these maps as well as to estimate. Representative values for porosity and water saturation. Cumulative recovery from the Delhi unit prior to carbon dioxide injection was about 195 million barrels. Estimates of ultimate recovery resulting from carbon dioxide injection in the Holt-Bryant reservoir were obtained after applying recovery factors to the current carbon dioxide flood area OOIP of 323 million barrels. This recovery factor is based on consideration of the type of energy inherent in the reservoirs, analyses of the petroleum, the structural positions of the properties, and the production histories. Oil production response to the carbon dioxide was observed in March 2010. Based on the production response from a number of producers, and noting the amount of carbon dioxide injection to date, a total recovery factor for proved reserves was estimated to be about 13.8 percent of pattern-area OOIP, incremental probable reserves about 4.2 percent of OOIP, and incremental possible reserves about 2.5 percent of OOIP.
Evolution has represented that processing of produced gas for NGL will begin in January 2017. Estimates of NGL reserves were based on installation of a plant to recover NGL and methane. The methane is planned to be used as fuel for plant and field operations. The plant NGL yield was provided by Evolution.
Gas quantities estimated herein are expressed as separator gas and sales gas. Separator gas is the gas remaining after field separation but prior to gas processing and shrinkage for fuel use or flare. Sales gas is defined as that portion of the separator gas to

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be delivered into a gas pipeline for sale after separation, processing, fuel use, and flare. All of the produced gas is consumed as fuel or lost in processing so the net sales gas reserves are zero. Gross gas reserves are reported as separator gas. All gas quantities are expressed at a temperature base of 60 degrees Fahrenheit and at a pressure base of 15.025 pounds per square inch absolute. Gas quantities included in this report are expressed in thousands of cubic feet (Mcf).
Oil and condensate reserves estimated herein are those to be recovered by conventional lease separation and are expressed in terms of barrels (bbl) representing 42 United States gallons per barrel. For reporting purposes, oil and condensate reserves have been estimated separately and are presented herein as a summed quantity. NGL reserves are those attributed to the leasehold interests according to processing agreements.
Definition of Reserves
Petroleum reserves included in this report are classified by degree of proof as proved, probable, or possible. Reserves classifications used in this report are in accordance with the reserves definitions of Rules 4-10 (a) (1)-(32) of Regulation S-X of the SEC. Reserves are judged to be economically producible in future years from known reservoirs under existing economic and operating conditions and assuming continuation of current regulatory practices using conventional production methods and equipment. In the analyses of production-decline curves, reserves were estimated only to the limit of economic rates of production under existing economic and operating conditions using prices and costs consistent with the effective date of this report, including consideration of changes in existing prices provided only by contractual arrangements but not including escalations based upon future conditions. The petroleum reserves are classified 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

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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.

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(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.
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.
(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 (iv) and (vi) of the definition of possible reserves.

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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)

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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 (iii) of the proved oil and gas reserves definition, 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.
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.
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.

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(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 [section 210.4-10 (a) Definitions], or by other evidence using reliable technology establishing reasonable certainty.
The extent to which probable and possible reserves ultimately may be reclassified as proved reserves is dependent upon future drilling, testing, and well performance. The degree of risk to be applied in evaluating probable and possible reserves is influenced by economic and technological factors as well as the time element. Probable and possible reserves in this report have not been adjusted in consideration of these additional risks and therefore are not comparable with proved reserves.
Primary Economic Assumptions
Revenue values in this report were estimated using the initial prices and costs specified by Evolution. Future prices were estimated using guidelines established by the SEC and the Financial Accounting Standards Board (FASB). The prices used in this report were based on SEC guidelines. The assumptions used for estimating future prices and expenses are as follows:
Oil and Condensate Prices
An oil and condensate price differential for each property was calculated from data provided by Evolution. The price for each property was calculated by applying this differential to a WTI crude oil price of $42.91 per barrel and was held constant over the life of each property. The WTI price of $42.91 is the 12-month average price calculated as the unweighted arithmetic average of the first-day-of-the-month price for each month within the 12

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month period prior to June 30, 2016. The volume-weighted average price attributable to the proved reserves over the lives of the properties was $40.91 per barrel.
NGL Prices
Evolution has represented that the NGL prices were based on a 12-month average price, calculated as the unweighted arithmetic average of the first-day-of-the-month price for each month within the 12-month period prior to the end of the reporting period, unless prices are defined by contractual arrangements. The volume-weighted average price attributable to the proved reserves over the lives of the properties was
$14.38 per barrel.
Operating Expenses, Capital Costs, and Abandonment Costs
Estimates of operating expenses, capital costs, and abandonment costs, based on information provided by Evolution for current costs, were used for the lives of the properties with no increases in the future based on inflation. Future expenditures are estimated to be higher than current levels due to the installation of a carbon dioxide injection program, which began in November 2009 and is to be expanded through 2022. Evolution is expected to pay $0.64 per Mcf of carbon dioxide until December 2019, and then $0.54 per Mcf of carbon dioxide thereafter. Recycled carbon dioxide is expected to cost 16 cents per Mcf. Future capital costs as provided by Evolution were estimated using 2016 values and were not adjusted for inflation. No significant capital costs other than abandonment are expected after 2028.
Production and Ad Valorem Taxes
Production taxes were based on current state tax rates. The Delhi carbon dioxide flood has been qualified as a tertiary recovery project. As such, no oil and condensate production taxes will be charged until a payout is achieved of investment and certain

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interest expenses by all revenue from the project. Oil and condensate production taxes then revert to the normal 12.5-percent rate, which are held constant until average oil production per well drops below 25 barrels per day, and then reduced to 6.25 percent. However, payout is not expected to
Be reached prior to depletion. As such, no oil and condensate production taxes are included. Production taxes for NGL are included at $0.98 per barrel. Evolution has stated that no ad valorem taxes are charged to the Louisiana royalty owners, so no such taxes were included until conversion to a working interest.
Summary and Conclusions
The estimates of net proved, probable, and possible reserves attributable to Evolution from the properties evaluated, as of June 30, 2016, are summarized as follows, and expressed in thousands of barrels (Mbbl) and millions of cubic feet (MMcf):

|  | Net Reserves
|  | Oil (Mbbl) |  | NGL (Mbbl) |  | Sales Gas (MMcf)
Proved |  |  |  |  |  |
Developed Producing |  | 7,168 |  |  | — |  |  | — |
Developed Nonproducing |  | — |  |  | — |  |  | — |
Undeveloped |  | 1,421 |  |  | 2,235 |  |  | — |
Total Proved |  | 8,589 |  |  | 2,235 |  |  | — |
Probable |  |  |  |  |  |
Developed Producing |  | 3,092 |  |  | — |  |  | — |
Developed Nonproducing |  | — |  |  | — |  |  | — |
Undeveloped |  | 472 |  |  | 934 |  |  | — |
Total Probable |  | 3,564 |  |  | 934 |  |  | — |
Possible |  |  |  |  |  |
Developed Producing |  | 1,965 |  |  | — |  |  | — |
Developed Nonproducing |  | — |  |  | — |  |  | — |
Undeveloped |  | 186 |  |  | 563 |  |  | — |
Total Possible |  | 2,151 |  |  | 563 |  |  | — |
Note: Probable and possible reserves have not been risk adjusted to make them comparable to proved reserves.

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The estimated future revenue to be derived from the production and sale of the estimated net proved, probable, and possible reserves, as of June 30, 2016, of the properties evaluated is summarized as follows, expressed in thousands of dollars (M$):

|  |  | Proved |  |  |  |
| Developed |  | Developed |  |  |  | Total
Producing |  | Non-Producing |  | Undeveloped |  | Proved
(M$) |  | (M$) |  | (M$) |  | (M$)
Future Gross Revenue | 293,250 |  |  | — |  |  | 90,241 |  |  | 383,491 |
Production Taxes | — |  |  | — |  |  | 2,186 |  |  | 2,186 |
Ad Valorem Taxes | 1,202 |  |  | — |  |  | 361 |  |  | 1,563 |
Operating Expenses | 143,835 |  |  | — |  |  | 31,598 |  |  | 175,433 |
Capital Costs | 526 |  |  | — |  |  | 14,803 |  |  | 15,329 |
Abandonment Costs | 1,194 |  |  | — |  |  | 72 |  |  | 1,266 |
Future Net Revenue | 146,493 |  |  | — |  |  | 41,221 |  |  | 187,714 |
Present Worth at 10 Percent | 88,901 |  |  | — |  |  | 11,968 |  |  | 100,869 |
|  |  | Probable |  |  |  |
| Developed |  | Developed |  |  |  | Total
| Producing |  | Non-Producing |  | Undeveloped |  | Probable
| (M$) |  | (M$) |  | (M$) |  | (M$)
Future Gross Revenue | 126,503 |  |  | — |  |  | 32,709 |  |  | 159,212 |
Production Taxes | — |  |  | — |  |  | 913 |  |  | 913 |
Ad Valorem Taxes | 519 |  |  | — |  |  | 130 |  |  | 649 |
Operating Expenses | 27,240 |  |  | — |  |  | 6,319 |  |  | 33,559 |
Capital Costs | — |  |  | — |  |  | — |  |  | — |
Abandonment Costs | — |  |  | — |  |  | — |  |  | — |
Future Net Revenue | 98,744 |  |  | — |  |  | 25,347 |  |  | 124,091 |
Present Worth at 10 Percent | 40,079 |  |  | — |  |  | 6,879 |  |  | 46,958 |
|  |  | Possible |  |  |  |
| Developed |  | Developed |  |  |  | Total
| Producing |  | Non-Producing |  | Undeveloped |  | Possible
| (M$) |  | (M$) |  | (M$) |  | (M$)
Future Gross Revenue | 80,360 |  |  | — |  |  | 15,721 |  |  | 96,081 |
Production Taxes | — |  |  | — |  |  | 551 |  |  | 551 |
Ad Valorem Taxes | 329 |  |  | — |  |  | 63 |  |  | 392 |
Operating Expenses | 12,577 |  |  | — |  |  | 3,123 |  |  | 15,700 |
Capital Costs | — |  |  | — |  |  | — |  |  | — |
Abandonment Costs | — |  |  | — |  |  | — |  |  | — |
Future Net Revenue | 67,454 |  |  | — |  |  | 11,984 |  |  | 79,438 |
Present Worth at 10 Percent | 19,665 |  |  | — |  |  | 2,284 |  |  | 21,949 |

Notes:

1. | Future income tax expenses were not taken into account in the preparation of these estimates.

2. | Values for probable and possible reserves have not been risk adjusted to make them comparable to values for proved reserves.

While the oil and gas industry may be subject to regulatory changes from time to time that could affect an industry participant's ability to recover its oil, condensate, NGL, and gas reserves, we are not aware of any such governmental actions which would restrict

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the recovery of the June 30, 2016, estimated reserves.
In our opinion, the information relating to estimated proved, probable, and possible reserves, estimated future net revenue from proved reserves, and present worth of estimated future net revenue from proved reserves of oil, condensate, NGL and gas contained in this report has been prepared in accordance with Paragraphs 932-235-50-4, 932-235-50-6, 932-235-50-7, 932-235-50-9, 932-235-50-30, and
932-235-50-31(a), (b), and (e) of the Accounting Standards Update 932-235-50, Extractive Industries - Oil and Gas (Topic 932): Oil and Gas Reserve Estimation and Disclosures (January 2010) of the Financial Accounting Standards Board and Rules 4-10 (a) (1)-(32) of Regulation S-X and Rules 302(b), 1201, 1202(a) (1), (2), (3), (4), (5), (8), and 1203(a) of Regulation S-K of the Securities and Exchange Commission; provided, however, that (i) future income tax expenses have not been taken into account in estimating the future net revenue and present worth values set forth herein and (ii) estimates of the proved developed and proved undeveloped reserves are not presented at the beginning of the year.
To the extent the above-enumerated rules, regulations, and statements require determinations of an accounting or legal nature, we, as engineers, are necessarily unable to express an opinion as to whether the above-described information is in accordance therewith or sufficient therefor.
DeGolyer and MacNaughton is an independent petroleum engineering consulting firm that has been providing petroleum consulting services throughout the world since 1936. DeGolyer and MacNaughton does not have any financial interest, including stock ownership, in Evolution. Our fees were not contingent on the results of our evaluation. This letter report has been prepared at the request of Evolution. DeGolyer and MacNaughton has used all assumptions, data, procedures, and methods that it considers necessary and appropriate to prepare this report
Submitted,

|  | /s/ DeGolyer and MacNaughton
|  | DeGOLYER and MacNAUGHTON
|  | Texas Registered Engineering Firm F-716
|  | /s/ Dennis W. Thompson, PE
|  | Dennis W. Thompson, PE
|  | Senior Vice President
|  | DeGolyer and MacNaughton

DeGolyer and MacNaughton
CERTIFICATE of QUALIFICATION
I, Dennis W. Thompson, Petroleum Engineer with DeGolyer and MacNaughton, 5001 Spring Valley Road, Suite 800 East, Dallas, Texas, 75244 U.S.A., hereby certify:

1. | That I am a Senior Vice President with DeGolyer and MacNaughton, which company did prepare the report entitled “Report as of June 30, 2016 on Reserves and Revenue of Certain Properties owned by Evolution Petroleum Corporation,” and that I, as Senior Vice President, was responsible for the preparation of this report.

2. | That I attended Eastern New Mexico University, and that I graduated with a Bachelor of Science degree in Geology in the year 1973; that I earned a Master of Science degree in Petroleum Engineering from the University of Texas at Austin in 1975; that I am a Registered Professional Engineer in the State of Texas; that I am a member of the Society of Petroleum Engineers; and that I have in excess of 36 years of experience in oil and gas reservoir studies and reserves evaluations.

|  | /s/ DeGolyer and MacNaughton |
|  | DeGOLYER and MacNAUGHTON |
|  | Texas Registered Engineering Firm F-716 |
|  | /s/ Dennis W. Thompson, PE |
|  | Dennis W. Thompson, PE |
|  | Senior Vice President |
|  | DeGolyer and MacNaughton |