Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Producing Activities (Unaudited) - Changes In Reserves (Details)

v3.19.3.a.u2
Supplemental Information on Oil and Gas Producing Activities (Unaudited) - Changes In Reserves (Details)
MMcfe in Thousands, Bcfe in Thousands
12 Months Ended
Dec. 31, 2019
Bcfe
MMcfe
Dec. 31, 2018
MMcfe
Dec. 31, 2017
MMcfe
Supplemental Information on Oil and Gas Producing Activities (Unaudited)      
Extensions, discoveries and other additions 3,705 2,781 2,148
Revisions (1,648) (1,042) 176
Time period of the development plan 5 years 5 years 5 years
Increase (decrease) in proved reserves due to performance revisions   (433) 345
Increase (decrease) in proved reserves due to development plan revisions (1,705) (742) (188)
Increase in proved reserves due to additions to development plan 595 1,722 2,092
Decrease in proved reserves due to reclassifications related to five-year rule (2,300) (2,464) (2,280)
Increase in proved reserves due to improved well performance 63    
Increase (decrease) in proved reserves resulting from price revisions (157) 18 132
Increase (decrease) in proved reserves due to ethane recovery 315 115 (113)
Increase (decrease) in proved reserves due to deconsolidation of equity method investment. 164    
Production 1,175 989 822