Occidental Petroleum 2012 Annual Report Download - page 78
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Gas Reserves
United
Latin
Middle East/
States
America (a)
North Africa (b)
Total
2,799
53 2,175 5,027
Revisions of previous estimates
(55)
(1)
(60) (116)
Improved recovery
344
10
87 441
Extensions and discoveries
7
—
12 19
Purchases of proved reserves
186
—
— 186
Sales of proved reserves
—
—
—
—
Production
(247)
(6)
(166)
(419)
3,034
56
2,048
5,138
Revisions of previous estimates
(369)
(19)
(78)
(466)
Improved recovery
222
2
95
319
Extensions and discoveries
35
—
16
51
Purchases of proved reserves
728
—
—
728
Sales of proved reserves
—
—
—
—
Production
(285)
(6)
(156)
(447)
Revisions of previous estimates
Improved recovery
Extensions and discoveries
Purchases of proved reserves
Sales of proved reserves
Production
December 31, 2009
1,931
51
1,759 3,741
December 31, 2010
2,007
50 1,665 3,722
December 31, 2011
2,365
32 1,555 3,952
December 31, 2009
868
2 416 1,286
December 31, 2010
1,027
6 383 1,416
December 31, 2011
1,000
1 370 1,371
(a) Excludes proved natural gas reserves from the Argentine operations sold in February 2011 and classified as discontinued operations of 182 Bcf and 130 Bcf as of December 31, 2010 and
2009, respectively.
(b) A substantial majority of proved reserve amounts relate to PSCs and other similar economic arrangements.
(c) Approximately 3 percent of the proved developed reserves at December 31, 2012 are nonproducing, the majority of which are located in the United States.
(d) The amount of Occidental's proved undeveloped reserves that are not expected to be developed within five years from the date initially recorded was insignificant.