Publicly Traded / Private Petroleum Companies

(Several petroleum companies from various countries)

Amerada Hess Andadarko Apache Berry Petroleum Bill Barrett Corporation BG Group (UK) BP (UK) Cabot Oil & Gas Chesapeake Chevron ConocoPhillips Devon Dominion

El Paso EnCana (Canada) Eni (Italy) EOG Resources ExxonMobil Forest Oil Husky Energy (Canada) Lukoil (Russia) Marathon McMoRan Exploration Murphy Newfield Exploration Nexen (Canada)

Noble Energy Occidental Petroleum Petro-Canada (Canada) PetroChina (China) Pioneer Natural Resources Plains Exploration & Production Questar Repsol YPF (Spain) Samson Santos (Australia) Shell (Netherlands) Stone Energy Sinopec Corp. (China)

StatoilHydro (Norway) St. Mary Land & Exploration Suncor Energy (Canada) Talisman Energy (Canada) Tatneft (Russia) Total (France) Vintage Petroleum Whiting Petroleum Williams Production Woodside (Australia) XTO Energy

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National Petroleum Companies

(State/Government-run petroleum companies - First 11 are OPEC Members)

Sonatrach (Algeria) Pertamina (Indonesia) National Iranian Oil Company (NIOC) Iraq National Oil Company (INOC) Kuwait Petroleum Corporation (KPC) Libyan National Oil Corporation Nigerian National Petroleum Corporation (NNPC) Qatar General Petroleum Corporation (QP) Saudi Aramco Abu Dhabi National Oil Company (ADNOC) Petroleos de Venezuela SA (PDVSA) Ecopetrol (Columbia) Petroleos Mexicanos-PEMEX (Mexico) Petroleum Development Oman (PDO) Petrobras (Brazil) China National Petroleum Corporation National Oil and Gas Company of Turkey (TPAO)

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OPEC 2003 Proven Oil & Gas Reserves

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