Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Exploration and Production Activities (Unaudited) (Tables)

v3.20.4
Supplemental Information on Oil and Gas Exploration and Production Activities (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2020
Extractive Industries [Abstract]  
Schedule of capitalized costs related to oil and gas producing activities
Capitalized Costs Related to Oil and Gas Producing Activities
2020 2019
(In thousands)
Proved properties $ 9,359,866  $ 8,909,069 
Unproved properties 1,457,043  1,686,666 
10,816,909  10,595,735 
Accumulated depreciation, depletion, amortization and impairment (8,778,759) (7,191,957)
Net capitalized costs $ 2,038,150  $ 3,403,778 
Schedule of cost incurred in oil and gas property acquisition and development activities
Costs Incurred in Oil and Gas Property Acquisition and Development Activities
2020 2019 2018
(In thousands)
Acquisition $ 15,260  $ 37,598  $ 119,444 
Development 276,622  594,673  714,269 
Exploratory —  9,762  22,081 
Total $ 291,882  $ 642,033  $ 855,794 
Schedule of results of operations for oil and gas production activities The results of operations exclude general office overhead and interest expense attributable to oil and gas production.
2020 2019 2018
(In thousands)
Revenues $ 801,251  $ 1,354,766  $ 1,675,180 
Production costs (537,609) (620,412) (611,965)
Depletion (229,702) (539,379) (476,517)
Impairment (1,357,099) (2,039,770) — 
Income tax (expense) benefit (7,290) 7,563  68 
Results of operations from producing activities $ (1,330,449) $ (1,837,232) $ 586,766 
Depletion per Mcf of gas equivalent (Mcfe) $ 0.61  $ 1.08  $ 0.96 
Schedule of oil and gas reserves These estimates are reviewed annually and revised, either upward or downward, as warranted by additional performance data.
Oil (MMBbl) Natural Gas (Bcf) NGL (MMBbl) Natural Gas Equivalent (Bcfe)
Proved Reserves
December 31, 2017 19  4,825  76  5,395 
Purchases of reserves —  —  —  — 
Extensions and discoveries 622  10  711 
Sales of reserves —  (43) —  (45)
Revisions of prior reserve estimates —  (827) (821)
Current production (3) (444) (6) (497)
December 31, 2018 21  4,134  81  4,743 
Purchases of reserves —  —  —  — 
Extensions and discoveries 997  13  1,097 
Sales of reserves (2) (63) —  (77)
Revisions of prior reserve estimates (2) (562) (27) (734)
Current production (2) (458) (5) (502)
December 31, 2019 18  4,048  62  4,528 
Purchases of reserves —  —  —  — 
Extensions and discoveries 216  240 
Sales of reserves —  (74) —  (75)
Revisions of prior reserve estimates (4) (1,564) (23) (1,725)
Current production (2) (345) (4) (380)
December 31, 2020 13  2,281  38  2,588 
Proved developed reserves
December 31, 2018 10  1,813  41  2,115 
December 31, 2019 1,757  30  1,984 
December 31, 2020 1,358  22  1,527 
Proved undeveloped reserves
December 31, 2018 11  2,321  40  2,628 
December 31, 2019 10  2,291  32  2,544 
December 31, 2020 923  16  1,061 
Totals may not sum or recalculate due to rounding.
Schedule of standardized measure of discounted future net cash flows relating to proved oil and gas reserves
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves  
  Year ended December 31,
  2020 2019 2018
(In millions)
Future cash flows $ 4,079  $ 10,451  $ 14,483 
Future development and abandonment costs (652) (2,058) (2,438)
Future production costs (2,325) (4,513) (5,068)
Future production taxes (137) (333) (456)
Future income taxes —  —  (943)
Future net cash flows 965  3,547  5,578 
10% discount to reflect timing of cash flows (425) (1,844) (2,596)
Standardized measure of discounted future net cash flows $ 540  $ 1,703  $ 2,982 
Schedule of changes in standardized measure of discounted future net cash flows relating to proved oil and gas reserves
Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves
  Year ended December 31,
  2020 2019 2018
(In millions)
Sales and transfers of oil and gas produced, net of production costs $ (264) $ (734) $ (1,063)
Net changes in prices, production costs, and development costs (954) (1,372) 591 
Acquisition of oil and gas reserves in place —  —  — 
Extensions and discoveries 38  388  519 
Previously estimated development costs incurred during the period 215  406  402 
Revisions of previous quantity estimates, less related production costs (255) (321) (357)
Sales of oil and gas reserves in place (6) (49) (26)
Accretion of discount 170  298  264 
Net changes in income taxes —  425  (185)
Change in production rates and other (109) (319) 194 
Total change in standardized measure of discounted future net cash flows $ (1,165) $ (1,278) $ 339