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CHEVRONTEXACO CORPORATION 2004 ANNUAL REPORT 89
NET PROVED RESERVES OF NATURAL GAS
Consolidated Companies
United States International
Gulf of Total Asia- Total Affiliated Companies
Billions฀of฀cubic฀feet฀ Calif. Mexico Other U.S. Africa Pacific Indonesia Other Int’l. Total TCO Hamaca
 341 2,361 4,685 7,387 1,872 4,239 520 3,088 9,719 17,106 2,262 42
Changes attributable to:
Revisions 16 (200) (414) (598) 277 375 15 92 759 161 293 1
Improved recovery9 11 1 21 42 – 4 10 56 77 – –
Extensions and
discoveries5 229 161 395 134 227 33 103 497 892 – –
Purchases1– 65 28 93 – 8 – – 8 101 – –
Sales2– – (3) (3) – – – – – (3) – –
Production (46) (414) (418) (878) (27) (203) (54) (369) (653) (1,531) (66) –
325 2,052 4,040 6,417 2,298 4,646 518 2,924 10,386 16,803 2,489 43
Changes attributable to:
Revisions 25 (106) (525) (606) 342 879 36 976 2,233 1,627 109 70
Improved recovery15 7 1 23 17 – 15 35 67 90 – –
Extensions and
discoveries – 270 118 388 3 76 12 47 138 526 – –
Purchases1 – 8 – 8 – 7 – 55 62 70 – –
Sales2(1) (12) (51) (64) – – – (6) (6) (70) – –
Production (41) (378) (394) (813) (18) (235) (61) (366) (680) (1,493) (72) (1)
323 1,841 3,189 5,353 2,642 5,373 520 3,665 12,200 17,553 2,526 112
Changes attributable to:
Revisions            
Improved recovery           
Extensions and
discoveries           
Purchases1           
Sales2           
Production            
            

At Jan. 1, 2002 284 1,976 3,986 6,246 444 2,920 250 2,231 5,845 12,091 1,477 6
At Dec. 31, 2002 266 1,770 3,600 5,636 582 2,934 262 2,157 5,935 11,571 1,474 6
At Dec. 31, 2003 265 1,572 2,964 4,801 954 3,627 223 3,043 7,847 12,648 1,789 52
            
1 Includes reserves acquired through property exchanges.
2 Includes reserves disposed of through property exchanges.
3 Net reserve changes (excluding production) in 2004 consist of (543) billion cubic feet of developed reserves and 490 billion cubic feet of undeveloped reserves for consolidated
companies and 883 billion cubic feet of developed reserves and 103 billion cubic feet of undeveloped reserves for affiliated companies.
4 During 2004, the percentages of undeveloped reserves at December 31, 2003, transferred to developed reserves were 4 percent and 6 percent for consolidated companies and
affiliated companies, respectively.
In฀2004,฀net฀revisions฀decreased฀reserves฀218฀million฀barrels฀
for฀consolidated฀companies฀and฀increased฀reserves฀for฀affiliates฀
by฀204฀million฀barrels.฀For฀consolidated฀companies,฀the฀decrease฀
was฀composed฀of฀161฀million฀barrels฀for฀international฀areas฀and฀
57฀million฀barrels฀for฀the฀United฀States.฀The฀largest฀downward฀
revision฀internationally฀was฀70฀million฀barrels฀in฀Africa.฀One฀
field฀in฀Angola฀accounted฀for฀the฀majority฀of฀the฀net฀decline฀as฀
changes฀were฀made฀to฀oil-in-place฀estimates฀based฀on฀reservoir฀
performance฀data.฀One฀field฀in฀the฀Asia-Pacific฀area฀essentially฀
accounted฀for฀the฀43-million-barrel฀downward฀revision฀for฀that฀
region.฀The฀revision฀was฀associated฀with฀reduced฀well฀perfor-
mance.฀Part฀of฀the฀36-million-barrel฀net฀downward฀revision฀
for฀Indonesia฀was฀associated฀with฀the฀effect฀of฀higher฀year-end฀
prices฀on฀the฀calculation฀of฀reserves฀for฀cost-oil฀recovery฀under฀
a฀production-sharing฀contract.฀In฀the฀United฀States,฀the฀68-mil-
lion-barrel฀net฀downward฀revision฀in฀the฀Gulf฀of฀Mexico฀area฀was฀
across฀several฀fields฀and฀based฀mainly฀on฀reservoir฀analyses฀and฀
assessments฀of฀well฀performance.฀For฀affiliated฀companies,฀the฀
206-million-barrel฀increase฀for฀TCO฀was฀based฀on฀an฀updated฀
assessment฀of฀reservoir฀performance฀for฀the฀Tengiz฀Field.฀Par-
tially฀offsetting฀this฀net฀increase฀was฀a฀downward฀effect฀of฀higher฀
year-end฀prices฀on฀the฀variable฀royalty-rate฀calculation.฀Down-
ward฀revisions฀also฀occurred฀in฀other฀geographic฀areas฀because฀
of฀the฀effect฀of฀higher฀year-end฀prices฀on฀various฀production-
sharing฀terms฀and฀variable฀royalty฀calculations.
Improved฀Recovery฀ In฀2002,฀improved฀recovery฀increased฀
liquids฀volumes฀worldwide฀by฀239฀million฀barrels฀for฀consoli-
dated฀companies.฀The฀largest฀increase฀of฀99฀million฀barrels฀
occurred฀in฀the฀United฀States,฀primarily฀in฀the฀California฀region฀
due฀to฀pattern฀modifications,฀injector฀conversions฀and฀infill฀drill-
ing฀on฀a฀large฀heavy฀oil฀field฀under฀thermal฀recovery.
Extensions฀and฀Discoveries฀ In฀2002,฀extensions฀and฀discov-
eries฀increased฀liquids฀volumes฀worldwide฀by฀442฀million฀barrels฀
for฀consolidated฀companies.฀The฀largest฀increase฀was฀301฀million฀
barrels฀in฀Africa,฀principally฀172฀million฀barrels฀reflecting฀the฀
project฀sanction฀of฀a฀recent฀discovery฀in฀Nigeria฀and฀96฀million฀
barrels฀associated฀with฀approval฀of฀several฀development฀projects฀
in฀Angola.
TABLE V – RESERVE QUANTITY INFORMATION – Continued