Chesapeake Energy 1999 Annual Report Download - page 72

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Presented below is a summary of changes in estimated reserves of the Company for 1999, 1998, the Transition
Period and fiscal 1997:
December 31, 1999
December 31, 1997
June 30, 1997
-62-
U.S. Canada Combined
Oil
(MBbI) Gas
(MMcf) Oil Gas
(MBbI) (MMcI) Oil
(MBbl) Gas
(MMcI)
Proved reserves, beginning of period 22,560 724,018 33 231,773 22,593 955,791
Extensions, discoveries and other
Additions 4,593 158,801 37,835 4,593 196,636
Revisions of previous estimates 3,404 59,904 (98,571) 3,404 (38,667)
Production (4,147) (96,873) (11,737) (4,147) (108,610)
Sale of reserves-in-place (4,371) (31,616) (33) (796) (4,404) (32,412)
Purchase of reserves-in-place 2.756 64.3 50 19,738 84088
Proved reserves, end of period 24 795 878 584 178.242 24.795 1.056.826
Proved developed reserves:
Beginning of period 18 003 552 953 33 105.990 18.016 658943
End of period 11750 627.120 136203 17.750 73_3.23
December 31, 1998
U.S. Canada Combined
Oil Gas Oil Gas Oil Gas
(MBbl) (MMcfl (MBbl) (MMcf) (MBbI) (MMcf)
Proved reserves, beginning of period 18,226 339,118 18,226 339,118
Extensions, discoveries and other
Additions 3,448 90,879 3,448 90,879
Revisions of previous estimates (4,082) (60,477) (4,082) (60,477)
Production (5,975) (86,681) (1) (7,740) (5,976) (94,421)
Sale of reserves-in-place (30) (3,515) -(30) (3,515)
Purchase of reserves-in-place 10.973 444694 34 239,513 11.007 684.207
Proved reserves, end of period 22560 724.018 33 231.773 22593 955,791
Proved developed reserves:
Beginning of period 10 087 178.082 10,087 i78,082
End of period 18 003 552.953 33 105.990 18.016 658.943
U.S. Canada Combined
Oil
(MBbl) Gas
(MMcf) Oil Gas Oil
(MBbl) (MMcI') (MEbI) Gas
(MMcf)
Proved reserves, beginning of period 17,373 298,766 17,373 298,766
Extensions, discoveries and other
Additions 5,573 68,813 5,573 68,813
Revisions of previous estimates (3,428) (24,189) (3,428) (24,189)
Production (1,857) (27,327) (1,857) (27,327)
Sale of reserves-in-place -
Purchase of reserves-in-place 565 23.055 565 23,055
Proved reserves, end of period 18 226 339.118 18.226 339118
Proved developed reserves:
Beginning of period 7.324 15 1.879 7324
End of period 10.087 178.082 .1.0.0.8.7 178,082
U.S. Canada Combined
Oil Gas Oil Gas Oil Gas
(MBbI) (MMcI) (MBbl) (MMcf) (MBbl) (MMc!')
Proved reserves, beginning of period. 12,258 351,224 12,258 351,224
Extensions, discoveries and other
Additions 13,874 147,485 13,874 147,485
Revisions of previous estimates (5,989) (137,938) (5,989) (137,938)
Production (2,770) (62,005) (2,770) (62,005)
Sale of reserves-in-place -
Purchase of reserves-in-place
Proved reserves, end of period 17,373 298.766 17.373 298.766
Proved developed reserves:
Beginning of period 3.648 144 721 3648 144721
Endofperiod 7324 151.879 7,324 151.879