Supplemental Information About Oil & Natural Gas Producing Activities | Supplemental Information About Oil & Natural Gas Producing Activities (Unaudited) Costs Incurred For Oil and Natural Gas Producing Activities The following table sets forth the capitalized costs incurred in the Company’s oil and gas production, exploration, and development activities: Successor Predecessor October 11, 2016 January 1, 2016 Year Ended December 31, (in thousands) 2015 2014 Acquisition costs: Proved properties $ 561,251 $ 16,386 $ 14,268 $ 5,758 Unproved properties 1,905,660 39,399 28,955 16,409 Development costs 44,602 53,512 87,452 324,802 Exploration costs 844 — 84 — Total $ 2,512,357 $ 109,297 $ 130,759 $ 346,969 Results of Oil and Natural Gas Producing Activities The results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) are presented below: Successor Predecessor October 11, 2016 January 1, 2016 Year Ended December 31, (in thousands) 2015 2014 Revenues: Oil, natural gas and NGL sales $ 29,717 $ 69,116 $ 90,460 $ 131,825 Costs: Lease operating expenses 3,541 11,036 21,173 17,690 Severance and ad valorem taxes 1,636 3,696 5,021 6,875 Transportation, processing, gathering and other operating expenses 2,187 4,583 5,732 4,772 Depletion, amortization and accretion of asset retirement obligations 14,486 62,228 89,350 68,981 Abandonment expense and impairment of unproved properties — 2,545 7,619 20,025 Exploration 844 — 84 — Contract termination and rig stacking — — 2,387 — Income tax expense (benefit) — (406 ) (572 ) 1,524 Results of operations $ 7,023 $ (14,566 ) $ (40,334 ) $ 11,958 Oil and Gas Reserve Quantities The reserve estimates presented below were made in accordance with GAAP requirements for disclosures about oil and natural gas producing activities and Securities and Exchange Commission (“SEC”) rules for oil and natural gas reporting reserves estimation and disclosure. Estimates of the Company’s proved oil and natural gas reserves at December 31, 2016 , 2015 and 2014 were prepared by Netherland, Sewell & Associates, Inc. There are numerous uncertainties inherent in estimating quantities of proved oil and natural gas reserves. Oil and natural gas reserve engineering is a subjective process of estimating underground accumulations of oil and natural gas that cannot be precisely measured and the accuracy of any reserve estimate is a function of the quality of available data and of engineering and geological interpretation and judgment. Results of drilling, testing and production subsequent to the date of the estimate may justify revision of such estimate. Accordingly, reserve estimates are often different from the quantities of oil and natural gas that are ultimately recovered. The following table summarizes the average price during the 12-month period, determined as the unweighted arithmetic average of the first-day-of-the-month for the periods from October 11, 2016, through December 31, 2016 (Successor) and January 1, 2016, through October 10, 2016 (Predecessor) and for the years ended December 31, 2015 and 2014 . The following prices, as adjusted for transportation, quality, and basis differentials, were used in the calculation of the standardized measure of discounted future net cash flows (“standardized measure”): Successor Predecessor October 11, 2016 January 1, 2016 Year Ended December 31, 2015 2014 Oil (per Bbl) $ 38.49 $ 36.98 $ 41.85 $ 84.94 Gas (per Mcf) 0.98 1.24 1.71 4.70 NGLs (per Bbl) 14.59 13.28 13.94 22.70 The table below presents a summary of changes in the Company’s estimated proved reserves: Successor Predecessor October 11, 2016, through December 31, 2016 January 1, 2016, through October 10, 2016 Crude Oil (MBbls) Natural Gas Natural Gas Liquids (MBbls) Crude Oil (MBbls) Natural Gas Natural Gas Liquids (MBbls) Total proved reserves: Beginning of period 30,091 36,801 4,506 23,199 32,442 3,851 Extensions and discoveries 7,063 12,219 1,225 5,851 6,410 773 Revisions of previous estimates 184 16,445 983 1,025 (1,521 ) (110 ) Purchases of reserves in place 9,651 83,992 5,152 1,600 2,130 245 Divestitures of reserves in place — — — — — — Production (523 ) (1,113 ) (96 ) (1,584 ) (2,660 ) (253 ) End of period 46,466 148,344 11,770 30,091 36,801 4,506 Proved developed reserves: Beginning of period 11,346 14,973 1,927 9,347 12,711 1,603 End of period 14,551 42,190 3,618 11,346 14,973 1,927 Proved undeveloped reserves: Beginning of period 18,745 21,828 2,579 13,852 19,731 2,248 End of period 31,914 106,154 8,152 18,745 21,828 2,579 Predecessor Year Ended December 31, 2015 Year Ended December 31, 2014 Crude Oil (MBbls) Natural Gas Natural Gas Liquids (MBbls) Crude Oil (MBbls) Natural Gas Natural Gas Liquids (MBbls) Total proved reserves: Beginning of period 19,850 27,414 1,551 18,510 6,968 525 Extensions and discoveries 9,444 11,927 1,432 16,122 22,575 1,127 Revisions of previous estimates (5,109 ) (5,204 ) 995 56 178 180 Purchases of reserves in place 844 1,363 204 162 192 23 Divestitures of reserves in place — — — (13,572 ) (387 ) (69 ) Production (1,830 ) (3,058 ) (331 ) (1,428 ) (2,112 ) (235 ) End of period 23,199 32,442 3,851 19,850 27,414 1,551 Proved developed reserves: Beginning of period 8,026 11,959 766 6,021 4,837 382 End of period 9,347 12,711 1,603 8,026 11,959 766 Proved undeveloped reserves: Beginning of period 11,823 15,455 785 12,489 2,131 143 End of period 13,852 19,731 2,248 11,823 15,455 785 Proved reserves at December 31, 2016 increased 104% to 82,959 MBoe, compared to 40,730 MBoe at October 10, 2016. During the period from October 11, 2016, through December 31, 2016 (Successor) , the Company acquired 28,801 MBoe of proved reserves. Refer to Note 3—Property Acquisitions and Dispositions . Additionally, the Company added 10,324 MBoe of proved reserves through extensions, primarily due to its drilling activity, as well as, 3,908 MBoe of revisions due to improved results in completion techniques and adjustments of natural gas and NGL treatment through the gas plants slightly offset by 805 MBoe of production. Proved reserves at October 10, 2016 increased 25% to 40,730 MBoe, compared to 32,457 MBoe at December 31, 2015. During the period from January 1, 2016, through October 10, 2016 (Predecessor) , the Company acquired 2,200 MBoe of proved reserves. Refer to Note 3—Property Acquisitions and Dispositions . Additionally, the Company added 7,692 MBoe of proved reserves through extensions, primarily due to its drilling activity, as well as 660 MBoe due to positive performance revisions, slightly offset by 2,280 MBoe of production. Proved reserves at December 31, 2015 increased 25% to 32,457 MBoe, compared to 25,970 MBoe at December 31, 2014. During 2015, the Company added 12,864 MBoe of proved reserves through extensions, primarily due to its drilling activity. During 2015, the Company had net negative revisions of 4,981 MBoe. The significant decrease in commodity prices seen in 2015 resulted in negative revisions related to the conversion of approximately 6,794 MBoe from PUDs to unproved reserves, partially offset by a positive revision in performance. During 2015, the Company acquired 1,275 MBoe of proved reserves. Refer to Note 3—Property Acquisitions and Dispositions . During 2014, the Company added 21,012 MBoe of proved reserves through extensions and discoveries, primarily due to its continued development drilling program and 265 MBoe of proved reserves, due to better than expected performance of its proved developed reserves. During 2014, the Company divested of 13,706 MBoe of proved reserves. Refer to Note 3—Property Acquisitions and Dispositions . Standardized Measure of Discounted Future Net Cash Flows The standardized measure of discounted future net cash flows does not purport to be, nor should it be interpreted to present, the fair value of the oil and natural gas reserves of the property. An estimate of fair value would take into account, among other things, the recovery of reserves not presently classified as proved, the value of unproved properties and consideration of expected future economic and operating conditions. Estimated future production of proved reserves and estimated future production and development costs of proved reserves are based on current costs and economic conditions. The estimated future net cash flows are then discounted at a rate of 10%. It is not intended that the FASB’s standardized measure of discounted future net cash flows represent the fair market value of its’ Predecessor’s proved reserves. The Company cautions that the disclosures shown are based on estimates of proved reserve quantities and future production schedules which are inherently imprecise and subject to revision and the 10% discount rate is arbitrary. In addition, costs and prices as of the measurement date are used in the determinations and no value may be assigned to probable or possible reserves. The following table presents the Company’s standardized measure of discounted future net cash flows: Successor Predecessor October 11, 2016 January 1, 2016 Year Ended December 31, (in thousands) 2015 2014 Future cash inflows $ 2,105,585 $ 1,217,641 $ 1,079,962 $ 1,850,205 Future development costs (482,162 ) (297,559 ) (277,837 ) (440,366 ) Future production costs (640,306 ) (413,410 ) (450,058 ) (457,236 ) Future income tax expenses (136,587 ) (5,614 ) (6,643 ) (10,834 ) Future net cash flows 846,530 501,058 345,424 941,769 10% discount to reflect timing of cash flows (471,438 ) (291,345 ) (210,355 ) (575,886 ) Standardized measure of discounted future net cash flows $ 375,092 $ 209,713 $ 135,069 $ 365,883 The following summarizes the principal sources of change in the standardized measure of discounted future net cash flows: Successor Predecessor (in thousands) October 11, 2016 January 1, 2016 Standardized measure of discounted future net cash flows, beginning of period $ 209,713 $ 135,069 Sales of oil, natural gas and NGLs, net of production costs (22,354 ) (49,801 ) Purchase of minerals in place 127,842 10,145 Divestiture of minerals in place — — Extensions and discoveries, net of future development costs 55,825 46,438 Change in estimated development costs 10,891 11,743 Net change in prices and production costs (978 ) 6,661 Change in estimated future development costs 571 28,998 Revisions of previous quantity estimates 20,190 3,673 Accretion of discount 4,753 11,319 Net change in income taxes (47,990 ) (1,568 ) Net change in timing of production and other 16,629 7,036 Standardized measure of discounted future net cash flows, end of period $ 375,092 $ 209,713 Predecessor Year Ended December 31, (in thousands) 2015 2014 Standardized measure of discounted future net cash flows, beginning of period $ 365,883 $ 371,307 Sales of oil, natural gas and NGLs, net of production costs (58,534 ) (102,488 ) Purchase of minerals in place 14,416 5,650 Divestiture of minerals in place — (242,344 ) Extensions and discoveries, net of future development costs 57,894 312,532 Change in estimated development costs 16,100 10,386 Net change in prices and production costs (494,734 ) (3,027 ) Change in estimated future development costs 247,642 2,935 Revisions of previous quantity estimates (51,342 ) 924 Accretion of discount 37,517 13,561 Net change in income taxes 1,601 (2,762 ) Net change in timing of production and other (1,374 ) (791 ) Standardized measure of discounted future net cash flows, end of period $ 135,069 $ 365,883 |