Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Estimated Quantities of Net Proved, Proved Developed and Proved Undeveloped Oil, NGLs and Natural Gas Reserves (Details)

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Supplemental Oil and Gas Disclosures - Estimated Quantities of Net Proved, Proved Developed and Proved Undeveloped Oil, NGLs and Natural Gas Reserves (Details)
Mcfe in Millions, Boe in Millions, ft³ in Billions
 12 Months Ended
Dec. 31, 2021
Mcfe
MMBTU
MMBoe
MMBbls
ft³
Dec. 31, 2020
Mcfe
Boe
MMBoe
ft³
MMBbls
Dec. 31, 2019
MMBoe
Mcfe
Boe
MMBbls
ft³
Extensions and discoveries (Millions of Barrels of Oil Equivalent) | MMBTU 27.1    
Proved reserves, balance (Millions of Barrels of Oil Equivalent) | MMBTU 20.6    
Oil [Member]      
Proved reserves, balance (Million Barrels of Oil) 32.2 37.8 39.1
Revisions of previous estimates (Million Barrels of Oil) 10.0 (0.9) [1] 1.4
Extensions and discoveries (Million Barrels of Oil)   0.2 0.9
Purchase of minerals in place (Million Barrels of Oil)   0.7 3.1
Production (Million Barrels of Oil) (5.0) (5.6) (6.7)
Proved reserves, balance (Million Barrels of Oil) 37.2 32.2 37.8
Proved reserves, ending balance (Million Barrels of Oil) 27.6 24.0 28.0
Undeveloped reserves, ending balance (Million Barrels of Oil) 9.6 8.2 9.8
Natural Gas Liquids [Member]      
Proved reserves, balance (Million Barrels of Oil) 17.4 24.5 9.8
Revisions of previous estimates (Million Barrels of Oil) 3.1 (5.9) [1] (1.5)
Extensions and discoveries (Million Barrels of Oil)     0.1
Purchase of minerals in place (Million Barrels of Oil)   0.5 17.4
Production (Million Barrels of Oil) (1.4) (1.7) (1.3)
Proved reserves, balance (Million Barrels of Oil) 19.1 17.4 24.5
Proved reserves, ending balance (Million Barrels of Oil) 17.8 16.5 21.7
Undeveloped reserves, ending balance (Million Barrels of Oil) 1.3 0.9 2.8
Natural Gas [Member]      
Proved reserves, balance (Million Barrels of Oil) | ft³ 569.3 571.1 210.5
Revisions of previous estimates (Million Barrels of Oil) | ft³ 83.0 31.6 [1] (16.9)
Extensions and discoveries (Million Barrels of Oil) | ft³   0.2 1.2
Purchase of minerals in place (Million Barrels of Oil) | ft³ 0.1 [2] 14.8 417.6
Production (Million Barrels of Oil) | ft³ (44.8) (48.4) (41.3)
Proved reserves, balance (Million Barrels of Oil) | ft³ 607.6 569.3 571.1
Proved reserves, ending balance (Million Barrels of Oil) | ft³ 549.2 550.2 504.9
Undeveloped reserves, ending balance (Million Barrels of Oil) | ft³ 58.4 19.1 66.2
Oil Equivalent [Member]      
Proved reserves, balance (Millions of Barrels of Oil Equivalent) | MMBoe [3] 144.4 157.4 84.0
Revisions of previous estimates (Millions of Barrels of Oil Equivalent) | MMBoe [3] 27.1 (1.4) [1] (3.0)
Extensions and discoveries (Millions of Barrels of Oil Equivalent) | MMBoe [3]   0.2 1.1
Purchase of minerals in place (Millions of Barrels of Oil Equivalent) | MMBoe [3]   3.6 90.1
Production (Millions of Barrels of Oil Equivalent) | MMBoe [3] (13.9) (15.4) (14.8)
Proved reserves, balance (Millions of Barrels of Oil Equivalent) | MMBoe [3] 157.6 144.4 157.4
Proved reserves, ending balance (Millions of Barrels of Oil Equivalent) | MMBoe [3] 137.0 132.2 133.8
Undeveloped reserves, ending balance (Millions of Barrels of Oil Equivalent) | MMBoe [3] 20.6 12.2 23.6
Natural Gas Equivalent [Member]      
Proved reserves, balance (Millions of Barrels of Oil Equivalent) [3] 866.5 944,500.0 504.1
Revisions of previous estimates (Millions of Barrels of Oil Equivalent) | Mcfe [3] 162.4 (8.8) [1] (18.2)
Extensions and discoveries (Millions of Barrels of Oil Equivalent) | Mcfe [3]   1.3 6.7
Purchase of minerals in place (Millions of Barrels of Oil Equivalent) | Mcfe [3] 0.1 [2] 21.8 540.9
Production (Millions of Barrels of Oil Equivalent) [3] (83.5) (92.3) (89.0)
Proved reserves, balance (Millions of Barrels of Oil Equivalent) [3] 945.5 866.5 944,500.0
Proved reserves, ending balance (Millions of Barrels of Oil Equivalent) | Mcfe [3] 821.9 793.3 802.9
Undeveloped reserves, ending balance (Millions of Barrels of Oil Equivalent) | Mcfe [3] 123.8 73.2 141.6
[1] Decreases of 27.7 MMBoe were due to price revisions for all proved reserves. increases of 26.2 MMBoe were primarily related to technical revisions at our Mobile Bay and Fairway properties.
[2] Primarily related to Main Pass working interest acquisitions.
[3] Total Energy Equivalent