CHESAPEAKE ENERGY CORPORATION AND SUBSIDIARIES SUPPLEMENTARY INFORMATION – (Continued)
Oil (mmbbl) December 31, 2016 Proved reserves, beginning of period .......................................... Extensions, discoveries and other additions ......................... Revisions of previous estimates ............................................ Production ............................................................................. Sale of reserves-in-place ....................................................... Purchase of reserves-in-place ............................................... Proved reserves, end of period(c) ................................................. Proved developed reserves: Beginning of period ............................................................... End of period ......................................................................... Proved undeveloped reserves: Beginning of period ............................................................... End of period(b) ...................................................................... December 31, 2015 Proved reserves, beginning of period .......................................... Extensions, discoveries and other additions ......................... Revisions of previous estimates ............................................ Production ............................................................................. Sale of reserves-in-place ....................................................... Purchase of reserves-in-place ............................................... Proved reserves, end of period(d) ................................................. Proved developed reserves: Beginning of period ............................................................... End of period ......................................................................... Proved undeveloped reserves: Beginning of period ............................................................... End of period(b) ......................................................................
Gas (bcf)
NGL (mmbbl)
Total (mmboe)
313.7 191.2 (58.9) (33.2) (14.7) 1.0 399.1
6,041 1,798 598 (1,050) (1,190) 299 6,496
183.5 89.0 2.8 (24.4) (28.1) 3.6 226.4
1,504 580 43 (233) (241) 55 1,708
215.6 200.4
5,329 5,126
158.0 134.1
1,262 1,189
98.1 198.7
712 1,370
25.5 92.2
242 519
420.8 61.1 (110.0) (41.6) (16.6) — 313.7
10,692 805 (4,191) (1,070) (195) — 6,041
266.3 35.3 (75.8) (28.0) (14.3) — 183.5
2,469 231 (885) (248) (63) — 1,504
229.3 215.6
8,615 5,329
198.5 158.0
1,864 1,262
191.5 98.1
2,077 712
67.8 25.5
605 242
___________________________________________ (a)
Includes 1 mmbbl of oil, 20 bcf of natural gas and 2 mmbbls of NGL reserves owned by the Chesapeake Granite Wash Trust, of which 1 mmbbl of oil, 10 bcf of natural gas and 1 mmbbl of NGL are attributable to noncontrolling interest holders
(b)
As of December 31, 2017, 2016 and 2015, there were no PUDs that had remained undeveloped for five years or more.
(c)
Includes 1 mmbbl of oil, 23 bcf of natural gas and 2 mmbbls of NGL reserves owned by the Chesapeake Granite Wash Trust, 1 mmbbl of oil, 12 bcf of natural gas and 1 mmbbl of NGL of which are attributable to the noncontrolling interest holders.
(d)
Includes 1 mmbbl of oil, 32 bcf of natural gas and 3 mmbbls of NGL reserves owned by the Chesapeake Granite Wash Trust, 1 mmbbl of oil, 16 bcf of natural gas and 2 mmbbls of NGL of which are attributable to the noncontrolling interest holders.
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