BP 2011 Annual Report Download - page 270
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268 BP Annual Report and Form 20-F 2011
Supplementary information on oil and natural gas (unaudited)
Movements in estimated net proved reserves continued
million barrels
Bitumena2011
Rest of
North
America Total
Equity-accounted entities (BP share)
At 1 January 2011
Developed – –
Undeveloped 179 179
179 179
Changes attributable to
Revisions of previous estimates (1) (1)
Improved recovery – –
Purchases of reserves-in-place – –
Discoveries and extensions – –
Production – –
Sales of reserves-in-place – –
(1) (1)
At 31 December 2011
Developed – –
Undeveloped 178 178
178 178
a Proved 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 and
sales arrangements independently.