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)

v3.19.3.a.u2
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, MMBoe in Millions
12 Months Ended
Dec. 31, 2019
MMcf
Dec. 31, 2019
MBbls
Dec. 31, 2019
MBoe
Dec. 31, 2019
MMBoe
Dec. 31, 2018
MMcf
Dec. 31, 2018
MBbls
Dec. 31, 2018
MBoe
Dec. 31, 2017
MBoe
MMcf
MBbls
Proved developed and undeveloped reserves (Energy):                
Beginning of period     238,508 238.5     136,974 91,580
Purchase of reserves in place | MBoe     326,838       39,683 10,507
Sale of reserves in place     (32,456) (32.5)     0 0
Extensions and discoveries | MBoe     59,424       84,955 47,375
Revisions to previous estimates | MBoe             (11,086) (4,115)
Production | MBoe     (15,086)       (12,018) (8,373)
End of period     540,012 540.0     238,508 136,974
Proved undeveloped reserves:                
Beginning of period, MBOE proved developed | MBoe     128,605       69,318 43,232
End of period, MBOE proved developed | MBoe     230,977       128,605 69,318
Beginning of periodic, MBOE proved developed | MBoe     109,903       67,656 48,348
End of period, MBOE proved developed | MBoe     309,035       109,903 67,656
Commodity - Oil                
Proved developed and undeveloped reserves:                
Beginning of period | MBbls   180,097       107,072   71,145
Purchase of reserves in place | MBbls   183,382       30,756   8,388
Sales of reserves in place | MBbls   (17,980)       0   0
Extensions and discoveries | MBbls   45,663       67,763   39,267
Revisions to previous estimates | MBbls   (33,136)       (16,051)   (5,171)
Production | MBbls   (11,665)       (9,443)   (6,557)
End of period | MBbls   346,361       180,097   107,072
Proved undeveloped reserves:                
Beginning of period, proved developed | MBbls   92,202       51,920   32,920
End of period, proved developed | MBbls   152,687       92,202   51,920
Beginning of period, proved undeveloped | MBbls   87,895       55,152   38,225
End of period, proved undeveloped | MBbls   193,674       87,895   55,152
Proved Developed and Undeveloped Reserves (Volume) | MBbls   180,097       107,072   71,145
Proved Developed and Undeveloped Reserves (Volume) | MBbls   346,361       180,097   107,072
Commodity - Natural gas                
Proved developed and undeveloped reserves:                
Beginning of period 350,466       179,410     122,611
Purchase of reserves in place 455,158       53,563     12,711
Sales of reserves in place (86,856)       0     0
Extensions and discoveries 82,566       103,149     48,648
Revisions to previous estimates (24,482)       29,791     6,336
Production (19,718)       (15,447)     (10,896)
End of period 757,134       350,466     179,410
Proved undeveloped reserves:                
Beginning of period, proved developed 218,417       104,389     61,871
End of period, proved developed 320,676       218,417     104,389
Beginning of period, proved undeveloped 132,049       75,021     60,740
End of period, proved undeveloped 436,458       132,049     75,021
Proved Developed and Undeveloped Reserves (Volume) 350,466       179,410     122,611
Proved Developed and Undeveloped Reserves (Volume) 757,134       350,466     179,410
Natural gas liquids                
Proved developed and undeveloped reserves:                
Beginning of period 0       0     0
Purchase of reserves in place 67,597       0     0
Production (135)       0     0
End of period 67,462       0     0
Proved undeveloped reserves:                
Beginning of period, proved developed 0       0     0
End of period, proved developed 24,844       0     0
Beginning of period, proved undeveloped 0       0     0
End of period, proved undeveloped 42,618       0     0
Proved Developed and Undeveloped Reserves (Volume) | MBbls   0       0   0
Proved Developed and Undeveloped Reserves (Volume) | MBbls   67,462       0   0