Oil-Mail

Assam Oil Company Ltd. (ACL), India

Abu Dhabi National Oil Company (ADNOC), United Arab Emirates

Alon USA, United States

Amerada Hess Corporation, United States

Anadarko Petroleum Corporation, United States

Apache Corporation, United States

Arbusto Energy, United States

Atlantic Petroleum, Faroe Islands

BG Group, United Kingdom

Bharat Petroleum Corporation Limited, India

BHP Billiton, Australia

Buzachi Petroleum Operating, Kazakhstan

BP, United Kingdom

Cairn Energy, India

Canadian Natural Resources, Canada

Chevron Corporation, United States

Chief Oil and Gas, United States

Citgo, Venezuela

CNOOC Ltd., China

ConocoPhillips, United States

Cosmo Oil Company, Japan

Crown Central Petroleum, United States

Cupet, Cuba

Devon Energy, United States

Ecopetrol, Colombia

Edoardo Raffinerie Garrone, Italy

ENAP Sipetrol, Chile

Enbridge, Canada

EnCana, Canada

ENSCO International, United States

Eni, Italy

Essar oil ltd., India

Entreprise Tunisienne d’Activites Petroliere (ETAP), Tunisia

ExxonMobil, United States

First Texas Energy Corporation, United States

Galp Energia, Portugal

Graña Montero Petrolera GMP, Perú

Petronet LNG Limited, India

Gujarat Gas Co. Ltd., India

Gujarat State Petroleum Corporation, India

Gulf Oil, Luxembourg

Grupa LOTOS, Poland

Hargeisa Minerals & Resources Company Ltd, Somaliland

HryJax Petroleum

Hellenic Petroleum, Greece

Hess Corporation, United States

Hindustan Petroleum Corporation Ltd, India

Husky Energy, Canada

IB Daiwa, Japan

Imperial Oil, Canada

INA - Industrija Nafte, Croatia

Indian Oil Corporation, India

Inpex, Japan

Irving Oil, Canada

Japan Energy, Japan

Kaz-Munay Gaz, Kazakhstan

Karazhanbas Munay, Kazakhstan

Kerr-McGee, United States

Koch Industries, United States

Kuwait German Petroleum Company, Canada

Kuwait Gulf Oil Company, Kuwait

Kuwait National Petroleum Company, Kuwait.

Kuwait Oil Company, Kuwait

Kuwait Petroleum Corporation, Kuwait

LUKoil, Russia

M3nergy Gamma SDN. BHD., Malaysia

Marathon Oil Corporation, United States

Maurel & Prom, France

Maxol Group, Republic of Ireland

MedcoEnergi, Indonesia

Mol Group, Hungary

Naftna Industrija Srbije, Serbia

Naftogas of Ukraine, Ukraine

National Iranian Oil Company (NIOC), Iran

National Oil Corporation, Libya

Neste Oil, Finland

Nexen, Canada

Nippon Oil, Japan

NNPC, Nigeria

Oil Planet International Corp, United States

Northern Resources, Canada

Oil and Gas Development Company Limited, Pakistan

Occidental Petroleum, United States

Oil India Limited, India

Oman Oil Company (OOC), Oman

OMV, Austria

ONGC, India

PDVSA Petróleos de Venezuela, Venezuela

PEMEX Petroleos Mexicanos , Mexico

PKN Orlen S.A., Poland

PSO, Pakistan

Petroleum Development PDO, Oman

Perenco, France, United Kingdom

Petro-Canada, Canada

Petrobras, Brazil

PetroChina, China

PetroKazakhstan, Kazakhstan

Petrom, Romania

Petron Corporation, Philippines

PETRONAS, Malaysia

PETROPERU, Peru

PETROTRIN, Trinidad and Tobago

PetroVietnam, Vietnam

Pertamina, Indonesia

Polish Oil and Gas Company, Poland

Plains Exploration & Production Company (PXP), United States

PTT Public Company Limited, Thailand

Qatar Petroleum, Qatar

Reliance Industries Limited, India

Repsol YPF, Spain

Rompetrol Group N.V., Romania

Royal Dutch Shell, Netherlands, United Kingdom

Sagiz Petroleum, Kazakhstan

San-Ai Oil, Japan

Santos Limited, Australia

Sasol, South Africa

Saudi Aramco, Saudi Arabia

Shell Canada, Canada (subsidiary of Royal Dutch Shell)

Shell Oil Company, United States (subsidiary of Royal Dutch Shell)

Sinclair Oil, United States

Sinopec, China

Snpc, Congo-Brazzaville

Sonangol, Angola

Sonatrach, Algeria

SPC, Singapore

StatoilHydro, Norway

State Oil Company of Azerbaijan SOCAR, Azerbaijan

Somerset Refinery, United States.

State Oil Company of Suriname, Suriname

Sunoco, United States

Suncor Energy, Canada

Surgutneftegaz, Russia

Syncrude, Canada

Talisman Energy, Canada

Todd Energy, New Zealand

Total, France

Tullow Oil, United Kingdom

Unipetro ABC, Peru

United Refining Company, United States

Vaalco Energy Inc., United States

Wintershall, Germany

Woodside Petroleum, Australia

XTO Energy, United States

YPF, Argentina

YPFB, Bolivia

Zion Oil & Gas Inc., United States

Fuente: Wikipedia 

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