Supplemental Crude Oil and Natural Gas Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Supplemental Crude Oil and Natural Gas Information [Abstract]

Proved crude oil and natural gas reserves

Changes in proved reserves were as follows for the periods presented:


	Crude Oil (MBbls)	Natural Gas (MMcf)	Total (MBoe)
Proved reserves as of December 31, 2018	757,096	4,591,614	1,522,365
Revisions of previous estimates	(88,307)	(363,239)	(148,848)
Extensions, discoveries and other additions	162,710	1,213,947	365,034
Production	(72,267)	(311,865)	(124,244)
Sales of minerals in place	(803)	(6,224)	(1,840)
Purchases of minerals in place	1,758	30,238	6,798
Proved reserves as of December 31, 2019	760,187	5,154,471	1,619,265
Revisions of previous estimates	(249,845)	(1,530,174)	(504,874)
Extensions, discoveries and other additions	42,106	295,686	91,387
Production	(58,745)	(306,528)	(109,833)
Sales of minerals in place	—	—	—
Purchases of minerals in place	3,272	27,269	7,817
Proved reserves as of December 31, 2020	496,975	3,640,724	1,103,762
Revisions of previous estimates	14,574	233,966	53,569
Extensions, discoveries and other additions	165,268	1,235,022	371,105
Production	(58,636)	(370,110)	(120,321)
Sales of minerals in place	(70)	(469)	(148)
Purchases of minerals in place	175,419	371,546	237,343
Proved reserves as of December 31, 2021	793,530	5,110,679	1,645,310

Schedule of proved developed and undeveloped oil and gas reserve quantities

The following reserve information sets forth the estimated quantities of proved developed and proved undeveloped crude oil and natural gas reserves of the Company as of December 31, 2021, 2020 and 2019:


	December 31,
	2021	2020	2019
Proved Developed Reserves
Crude oil (MBbl)	424,153	281,906	336,405
Natural Gas (MMcf)	2,901,147	2,073,011	2,226,117
Total (MBoe)	907,678	627,407	707,424
Proved Undeveloped Reserves
Crude oil (MBbl)	369,377	215,069	423,782
Natural Gas (MMcf)	2,209,532	1,567,713	2,928,354
Total (MBoe)	737,632	476,355	911,841
Total Proved Reserves
Crude oil (MBbl)	793,530	496,975	760,187
Natural Gas (MMcf)	5,110,679	3,640,724	5,154,471
Total (MBoe)	1,645,310	1,103,762	1,619,265

Standardized Measure of Discounted Future Net Cash Flows

The following table sets forth the standardized measure of discounted future net cash flows attributable to proved crude oil and natural gas reserves as of December 31, 2021, 2020, and 2019. Discounted future net cash flows attributable to noncontrolling interests are not material relative to the Company's consolidated amounts and are not separately presented below.


	December 31,
In thousands	2021		2020		2019
Future cash inflows	$	67,034,046	$	21,334,235	$	49,893,470
Future production costs	(18,837,000)		(7,750,834)		(15,309,672)
Future development and abandonment costs	(7,751,678)		(3,950,752)		(10,033,887)
Future income taxes (1)	(7,862,849)		(724,569)		(3,351,657)
Future net cash flows	32,582,519		8,908,080		21,198,254
10% annual discount for estimated timing of cash flows	(15,946,126)		(4,254,515)		(10,736,613)
Standardized measure of discounted future net cash flows	$	16,636,393	$	4,653,565	$	10,461,641

Changes in Standardized Measure of Discounted Future Net Cash Flows

The changes in the aggregate standardized measure of discounted future net cash flows attributable to proved crude oil and natural gas reserves are presented below for each of the past three years.


	December 31,
In thousands	2021		2020		2019
Standardized measure of discounted future net cash flows at January 1	$	4,653,565	$	10,461,641	$	15,684,817
Extensions, discoveries and improved recoveries, less related costs	2,985,056		187,981		1,649,322
Revisions of previous quantity estimates	816,674		(2,952,489)		(1,564,503)
Changes in estimated future development and abandonment costs	706,168		4,760,286		1,401,513
Purchases (sales) of minerals in place, net	3,408,365		53,742		49,330
Net change in prices and production costs	9,396,945		(6,912,031)		(6,591,347)
Accretion of discount	489,273		1,183,993		1,865,034
Sales of crude oil and natural gas produced, net of production costs	(4,757,483)		(1,806,758)		(3,486,103)
Development costs incurred during the period	683,212		863,101		1,557,121
Change in timing of estimated future production and other	1,871,903		(2,325,024)		(1,690,779)
Change in income taxes	(3,617,285)		1,139,123		1,587,236
Net change	11,982,828		(5,808,076)		(5,223,176)
Standardized measure of discounted future net cash flows at December 31	$	16,636,393	$	4,653,565	$	10,461,641

- Definition

Tabular disclosure of the net quantities of an enterprise's interests in proved developed and undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period as of the beginning of the period, changes in quantities during the period, and as of the end of the period.

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- Definition

Tabular disclosure of the future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed.

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