BP Annual Report and Form 20-F 2011 - Company Reporting

Supplementary information on oil and natural gas (unaudited)Movements in estimated net proved reserves continuedbillion cubic feetNatural gas a 2009EuropeNorthAmericaSouthAmericaAfrica Asia Australasia TotalUKRest ofEuropeUSSubsidiariesAt 1 January 2009Developed 1,822 61 9,059 659 3,316 1,050 – 1,102 1,887 18,956Undeveloped 582 402 5,473 468 7,434 1,382 – 1,308 4,000 21,0492,404 463 14,532 1,127 10,750 2,432 – 2,410 5,887 40,005Changes attributable toRevisions of previous estimates (114) (8) 549 43 322 270 – (231) 22 853Improved recovery 34 – 550 5 322 49 – 82 75 1,117Purchases of reserves-in-place 159 – – – – – – 31 – 190Discoveries and extensions 150 – 496 94 105 59 – – 531 1,435Production b (243) (9) (907) (100) (929) (249) – (241) (189) (2,867)Sales of reserves-in-place (118) – (4) – – – – (223) – (345)(132) (17) 684 42 (180) 129 – (582) 439 383At 31 December 2009 cDeveloped 1,602 49 9,583 716 3,177 1,107 – 1,579 3,219 21,032Undeveloped 670 397 5,633 453 7,393 1,454 – 249 3,107 19,3562,272 446 15,216 1,169 10,570 2,561 – 1,828 6,326 40,388Equity-accounted entities (BP share) eAt 1 January 2009Developed – – – – 1,498 – 1,560 176 – 3,234Undeveloped – – – – 1,023 182 653 111 – 1,969– – – – 2,521 182 2,213 287 – 5,203Changes attributable toRevisions of previous estimates – – – – (26) (17) 204 (19) – 142Improved recovery – – – – 314 – 1 4 – 319Purchases of reserves-in-place – – – – – – – – – –Discoveries and extensions – – – – 6 – 23 – – 29Production b – – – – (165) – (219) (25) – (409)Sales of reserves-in-place – – – – (388) – – (154) – (542)– – – – (259) (17) 9 (194) – (461)At 31 December 2009 dDeveloped – – – – 1,252 – 1,703 80 – 3,035Undeveloped – – – – 1,010 165 519 13 – 1,707– – – – 2,262 165 2,222 93 – 4,742Total subsidiaries and equity-accounted entities (BP share)At 1 January 2009Developed 1,822 61 9,059 659 4,814 1,050 1,560 1,278 1,887 22,190Undeveloped 582 402 5,473 468 8,457 1,564 653 1,419 4,000 23,0182,404 463 14,532 1,127 13,271 2,614 2,213 2,697 5,887 45,208At 31 December 2009Developed 1,602 49 9,583 716 4,429 1,107 1,703 1,659 3,219 24,067Undeveloped 670 397 5,633 453 8,403 1,619 519 262 3,107 21,0632,272 446 15,216 1,169 12,832 2,726 2,222 1,921 6,326 45,130aProved 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 and ability to make lifting andsales arrangements independently.bIncludes 195 billion cubic feet of natural gas consumed in operations, 164 billion cubic feet in subsidiaries, 31 billion cubic feet in equity-accounted entities and excludes 16 billion cubic feet of producednon-hydrocarbon components which meet regulatory requirements for sales.cRest ofNorthAmericaIncludes 3,068 billion cubic feet of natural gas in respect of the 30% minority interest in BP Trinidad and Tobago LLC.dIncludes 131 billion cubic feet of natural gas in respect of the 5.79% minority interest in TNK-BP.eVolumes of equity-accounted entities include volumes of equity-accounted investments of those entities.RussiaRest ofAsiaFinancial statementsBP Annual Report and Form 20-F 2011 275