Estimated Quantities of Oil and Natural Gas Reserves (unaudited)
The following table sets forth certain data pertaining to our proved, proved developed and proved
undeveloped reserves for the three years ended December 31, 2011.
Oil
(MBbl)
Gas
(MMcf)
(MBOE)
2011
Consolidated entities
Proved Reserves
Beginning balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223,268 1,157,070 416,113
Revisions of previous estimates . . . . . . . . . . . . . . . . . . . . . . . 12,295
(64,972)
1,466
Extensions, discoveries and other additions . . . . . . . . . . . . . 36,436 232,872 75,248
Improved recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
-
-
Purchase of reserves in-place . . . . . . . . . . . . . . . . . . . . . . . .
1,382
17,454
4,291
Sale of reserves in-place . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(11,479)
(229,536)
(49,735)
Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(17,872)
(111,577)
(36,468)
Ending balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244,030 1,001,311 410,915
Proved Developed Reserves, December 31
. . . . . . . . . . . . . 151,480 454,248 227,188
Proved Undeveloped Reserves, December 31
. . . . . . . . . . . 92,550 547,063 183,727
Entity’s share of equity investee
(1)
Proved Reserves
Beginning balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4,600
60,828 14,738
Revisions of previous estimates . . . . . . . . . . . . . . . . . . . . . . .
2,081
829
2,219
Extensions, discoveries and other additions . . . . . . . . . . . . .
5
611
107
Improved recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
-
-
Purchase of reserves in-place . . . . . . . . . . . . . . . . . . . . . . . .
-
-
-
Sale of reserves in-place . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
-
-
Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(1,223)
(14,220)
(3,593)
Ending balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5,463
48,048 13,471
Proved Developed Reserves, December 31
. . . . . . . . . . . . .
4,921
39,066 11,432
Proved Undeveloped Reserves, December 31
. . . . . . . . . . .
542
8,982
2,039
Table continued on following page.
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