BP 2007 Annual Report Download - page 182

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Supplementary information on oil and natural gas continued
Movements in estimated net proved reserves 2006
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Natural gasabillion cubic feet
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Rest of Rest of Asia
UK Europe US Americas Pacific Africa Russia Other Total
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Subsidiaries
At 1 January 2006
Developed 2,382 245 11,184 3,560 1,459 934 – 281 20,045
Undeveloped 904 80 4,198 10,504 5,375 2,000 – 1,342 24,403
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3,286 325 15,382 14,064 6,834 2,934 – 1,623 44,448
Changes attributable to
Revisions of previous estimates (343) 11 (922) (291) (92) (69) – 33 (1,673)
Purchases of reserves-in-place –––––––––
Discoveries and extensions 101 – 116 – 21 5 – 2 245
Improved recovery 144 – 1,755 344 71 6 – 9 2,329
Productionb(370) (38) (941) (982) (273) (169) – (82) (2,855)
Sales of reserves-in-place (25)–(292)(9)––––(326)
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(493) (27) (284) (938) (273) (227) – (38) (2,280)
At 31 December 2006c
Developed 1,968 242 10,438 3,932 1,359 1,032 – 331 19,302
Undeveloped 825 56 4,660 9,194 5,202 1,675 – 1,254 22,866
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2,793 298 15,098 13,126 6,561 2,707 – 1,585 42,168
Equity-accounted entities (BP share)
At 1 January 2006
Developed – – – 1,492 50 – 1,089 130 2,761
Undeveloped – – – 848 26 – 169 52 1,095
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– – – 2,340 76 – 1,258 182 3,856
Changes attributable to
Revisions of previous estimates – – – 713 –21747284
Purchases of reserves-in-place –––––––––
Discoveries and extensions –––23––––23
Improved recovery –––731–––74
Productionb– – – (171) (15) – (204) (7) (397)
Sales of reserves-in-place –––(77)––––(77)
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– – – (145) (1) – 13 40 (93)
At 31 December 2006d
Developed – – – 1,460 52 – 1,087 170 2,769
Undeveloped – – – 735 23 – 184 52 994
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– – – 2,195 75 – 1,271 222 3,763
aProved reserves exclude royalties due to others, whether payable in cash or in kind where the royalty owner has a direct interest in the underlying production and the
option to make lifting and sales arrangements independently.
bIncludes 178 billion cubic feet of natural gas consumed in operations, 147 billion cubic feet in subsidiaries, 31 billion cubic feet in equity-accounted entities and excludes
8.3 billion cubic feet of produced non-hydrocarbon components which meet regulatory requirements for sales.
cIncludes 3,537 billion cubic feet of natural gas in respect of the 30% minority interest in BP Trinidad and Tobago LLC.
dIncludes 99 billion cubic feet of natural gas in respect of the 7.77% minority interest in TNK-BP.