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Chevron 2006 Annual Report

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Supplemental Information on Oil and Gas Producing Activities<br />

TABLE VII – CHANGES IN THE STANDARDIZED MEASURE OF DISCOUNTED<br />

FUTURE NET CASH FLOWS FROM PROVED RESERVES<br />

The changes in present values between years, which can<br />

be significant, reflect changes in estimated proved reserve<br />

quantities and prices and assumptions used in forecasting<br />

production volumes and costs. Changes in the timing of<br />

production are included with “Revisions of previous quantity<br />

estimates.”<br />

Consolidated Companies<br />

Affiliated Companies<br />

Millions of dollars <strong>2006</strong> 2005 2004 <strong>2006</strong> 2005 2004<br />

PRESENT VALUE AT JANUARY 1 $ 84,287 $ 48,134 $ 50,805 $ 26,769 $ 14,920 $ 13,118<br />

Sales and transfers of oil and gas produced net of<br />

production costs (32,690) (26,145) (18,843) (3,180) (2,712) (1,602)<br />

Development costs incurred 8,875 5,504 3,579 721 810 1,104<br />

Purchases of reserves 580 25,307 58 1,767 – –<br />

Sales of reserves (306) (2,006) (3,734) – – –<br />

Extensions, discoveries and improved recovery less related costs 4,067 7,446 2,678 – – –<br />

Revisions of previous quantity estimates 7,277 (13,564) 1,611 (967) (2,598) 970<br />

Net changes in prices, development and production costs (24,725) 61,370 6,173 (837) 19,205 266<br />

Accretion of discount 14,218 8,160 8,139 3,673 2,055 1,818<br />

Net change in income tax 4,237 (29,919) (2,332) (1,412) (4,911) (754)<br />

Net change for the year (18,467) 36,153 (2,671) (235) 11,849 1,802<br />

PRESENT VALUE AT DECEMBER 31 $ 65,820 $ 84,287 $ 48,134 $ 26,534 $ 26,769 $ 14,920<br />

100 CHEVRON CORPORATION <strong>2006</strong> ANNUAL REPORT

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