US independent energy company Unocal Corporation said its preliminary proved oil and gas reserve estimates for 2002 fell to 1.77 billion barrels-of-oil-equivalent (BOE) from 2001’s 1.82 billion BOE. The year-end reserves estimates reflect additions of 140 million BOE from discoveries and extensions and a net 89 million BOE from performance-related revisions and improved recovery. These…

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