Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Proved Developed and Undeveloped Oil and Gas Reserve Quantities) (Details)

v3.20.4
Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Proved Developed and Undeveloped Oil and Gas Reserve Quantities) (Details)
MMcf in Thousands, MBoe in Thousands, MBbls in Thousands
 12 Months Ended
Dec. 31, 2020
MBoe
MBbls
MMcf
Dec. 31, 2019
MBoe
MMcf
MBbls
Dec. 31, 2018
MBoe
MMcf
MBbls
Proved developed and undeveloped reserves (Energy):      
Beginning of period | MBoe 540,012 238,508 136,974
Purchase of reserves in place | MBoe 0 326,838 39,683
Sale of reserves in place | MBoe (16,120) (32,456) 0
Extensions and discoveries | MBoe 41,407 59,424 84,955
Revisions to previous estimates | MBoe   (37,216) (11,086)
Production | MBoe (37,193) (15,086) (12,018)
End of period | MBoe 475,879 540,012 238,508
Proved undeveloped reserves:      
Beginning of period, MBOE proved developed | MBoe 230,977 128,605 69,318
End of period, MBOE proved developed | MBoe 211,925 230,977 128,605
Beginning of periodic, MBOE proved developed | MBoe 309,035 109,903 67,656
End of period, MBOE proved developed | MBoe 263,954 309,035 109,903
Commodity - Oil      
Proved developed and undeveloped reserves:      
Beginning of period | MBbls 346,361 180,097 107,072
Purchase of reserves in place | MBbls 0 183,382 30,756
Sales of reserves in place | MBbls (9,673) (17,980) 0
Extensions and discoveries | MBbls 25,678 45,663 67,763
Revisions to previous estimates | MBbls (49,336) (33,136) (16,051)
Production | MBbls (23,543) (11,665) (9,443)
End of period | MBbls 289,487 346,361 180,097
Proved undeveloped reserves:      
Beginning of period, proved developed | MBbls 152,687 92,202 51,920
End of period, proved developed | MBbls 128,923 152,687 92,202
Beginning of period, proved undeveloped | MBbls 193,674 87,895 55,152
End of period, proved undeveloped | MBbls 160,564 193,674 87,895
Proved Developed and Undeveloped Reserves (Volume) | MBbls 346,361 180,097 107,072
Proved Developed and Undeveloped Reserves (Volume) | MBbls 289,487 346,361 180,097
Commodity - Natural gas      
Proved developed and undeveloped reserves:      
Beginning of period 757,134 350,466 179,410
Purchase of reserves in place 0 455,158 53,563
Sales of reserves in place (20,389) (86,856) 0
Extensions and discoveries 44,282 82,566 103,149
Revisions to previous estimates (198,628) (24,482) 29,791
Production (40,801) (19,718) (15,447)
End of period 541,598 757,134 350,466
Proved undeveloped reserves:      
Beginning of period, proved developed 320,676 218,417 104,389
End of period, proved developed 238,119 320,676 218,417
Beginning of period, proved undeveloped 436,458 132,049 75,021
End of period, proved undeveloped 303,479 436,458 132,049
Proved Developed and Undeveloped Reserves (Volume) 757,134 350,466 179,410
Proved Developed and Undeveloped Reserves (Volume) 541,598 757,134 350,466
Natural gas liquids      
Proved developed and undeveloped reserves:      
Beginning of period 67,462 0 0
Purchase of reserves in place 0 67,597 0
Sales of reserves in place | MBbls (3,049) 0 0
Extensions and discoveries | MBbls 8,349 0 0
Revisions to previous estimates | MBbls 30,214 0 0
Production (6,850) (135) 0
End of period 96,126 67,462 0
Proved undeveloped reserves:      
Beginning of period, proved developed 24,844 0 0
End of period, proved developed 43,315 24,844 0
Beginning of period, proved undeveloped 42,618 0 0
End of period, proved undeveloped 52,811 42,618 0
Proved Developed and Undeveloped Reserves (Volume) | MBbls 67,462 0 0
Proved Developed and Undeveloped Reserves (Volume) | MBbls 96,126 67,462 0