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EXHIBIT 13
FIVE YEAR FINANCIAL HIGHLIGHTS*
<Table>
<Caption>
- ---------------------------------------------------------------------------------------------------------
DOLLARS IN MILLIONS, % change
EXCEPT PER SHARE AMOUNTS 2002 2002-2001 2001 2000 1999 1998
- ------------------------ ------- --------- ------- ------- ------ -------
Revenues $ 3,860 (18) $ 4,718 $ 2,911 $ 748 $ 607
Operating Income (Loss) 1,425 n/m (363) 1,352 175 (8)
Net Income (Loss) Available to
Common Stockholders before
Change in Accounting Principle 825 n/m (183) 813 32 (49)
Net Income (Loss) 825 n/m (188) 796 32 (49)
Net Cash Provided by Operating Activities $ 2,196 (34) $ 3,321 $ 1,536 $ 318 $ 240
Per Common Share:
Net Income (Loss) -- Basic $ 3.32 n/m $ (0.75) $ 4.32 $ 0.25 $ (0.41)
Net Income (Loss) -- Diluted $ 3.21 n/m $ (0.75) $ 4.16 $ 0.25 $ (0.41)
Dividends $ 0.325 44 $ 0.225 $ 0.20 $ 0.20 $0.1875
Average Shares Outstanding -- Basic 248 (1) 250 184 125 120
Average Shares Outstanding -- Diluted 260 4 250 193 126 120
Capital Expenditures $ 2,388 (28) $ 3,316 $ 1,708 $ 680 $ 917
- ---------------------------------------------------------------------------------------------------------
Total Debt $ 5,471 8 $ 5,050 $ 3,984 $1,443 $ 1,425
Stockholders' Equity 6,972 10 6,365 6,786 1,535 1,259
Total Assets $18,248 9 $16,771 $16,590 $4,098 $ 3,633
- ---------------------------------------------------------------------------------------------------------
Annual Sales Volumes:
Gas (Bcf) 642 (8) 695 385 170 177
Oil and Condensate (MMBbls) 75 10 68 36 15 11
NGLs (MMBbls) 15 -- 15 12 7 7
Total Barrels of Oil Equivalent (MMBOE) 197 (1) 199 112 50 47
------- --- ------- ------- ------ -------
Average Daily Sales Volumes:
Gas (MMcf/d) 1,760 (8) 1,904 1,052 465 484
Oil and Condensate (MBbls/d) 205 10 186 98 40 30
NGLs (MBbls/d) 41 (2) 42 33 18 18
Total Barrels of Oil Equivalent (MBOE/d) 539 (1) 546 306 135 129
------- --- ------- ------- ------ -------
Oil Reserves (MMBbls) 1,131 -- 1,132 1,046 573 494
Gas Reserves (Tcf) 7.2 3 7.0 6.1 2.5 2.6
Total Reserves (MMBOE) 2,328 1 2,305 2,061 991 935
------- --- ------- ------- ------ -------
Worldwide Finding Cost ($/BOE)** $ 10.52 23 $ 8.53 $ 7.19 $ 4.87 $ 3.13
Worldwide Reserve Replacement
(% of Production) 112% (49) 221% 1,059% 213% 581%
Number of Employees 3,800 9 3,500 3,500 1,400 1,500
- ---------------------------------------------------------------------------------------------------------
</Table>
* Consolidated for Anadarko Petroleum Corporation and its subsidiaries. Certain
amounts for prior years have been reclassified to conform to the current
presentation.
** Worldwide finding costs are calculated by dividing worldwide costs incurred
by the worldwide reserve additions, excluding sales in place.
<Table>
<Caption>
Table of Measures
Bcf -- Billion cubic feet MMBOE -- Million barrels of oil equivalent
BOE -- Barrels of oil equivalent MMcf/d -- Million cubic feet per day
MBbls/d -- Thousand barrels per day n/m -- Not meaningful
MBOE/d -- Thousand barrels of oil equivalent per day Tcf -- Trillion cubic feet
MMBbls -- Million barrels
</Table>
STOCKHOLDER INFORMATION
The common stock of Anadarko Petroleum Corporation is traded on the New
York Stock Exchange. Average daily trading volume was 1,793,000 shares in 2002,
2,726,000 shares in 2001 and 1,618,000 shares in 2000. The ticker symbol for
Anadarko is APC and the daily stock reports published in local newspapers carry
trading summaries for the company under the headings Anadrk or Anadrkpete. The
following shows information regarding the closing market price of and dividends
paid on the company's common stock by quarter for 2002 and 2001.
<Table>
<Caption>
FIRST SECOND THIRD FOURTH
QUARTER QUARTER QUARTER QUARTER
------- ------- ------- -------
2002
Market Price
High $58.29 $58.01 $49.22 $49.92
Low $46.85 $46.86 $38.00 $42.13
Dividends $0.075 $0.075 $0.075 $0.100
2001
Market Price
High $72.99 $69.00 $59.75 $60.44
Low $54.63 $53.40 $44.05 $47.45
Dividends $0.050 $0.050 $0.050 $0.075
</Table>