E&P COMPANIES

Africa

• Sonatrach
• Sonangol Group
• National Petroleum Company of the Congo
• Vegas Oil and Gas
• Arabian Gulf Oil Company
• National Oil Corporation
• Nigerian National Petroleum Corporation
• Sasol
• Sudapet
• Entreprise Tunisienne d'Activites Petroliere
• Madagascar Oil 

Americas

• Bridas Corporation
• Enarsa
• YPF
• YPFB
• Petrobras
• OGX
• Canadian Natural Resources Limited
• Encana
• Husky Energy
• Imperial Oil
• Laricina Energy
• Nalcor Energy
• Nexen
• Pacific Rubiales Energy
• PetroKazakhstan
• Suncor Energy
• Syncrude
• Talisman Energy
• Empresa Nacional del Petróleo
• Ecopetrol
• Cupet
• Petroecuador
• Petróleos Mexicanos
• Petroperú
• Petrotrin
• Anadarko Petroleum Corporation
• Apache Corporation
• Chevron Corporation
• ConocoPhillips
• Continental Resources
• Devon Energy
• ExxonMobil
• Greka Energy
• Hess Corporation
• HKN, Inc.
• Koch Industries
• Marathon Oil
• Murphy Oil
• Occidental Petroleum
• Plains Exploration & Production
• SandRidge Energy
• Shell Oil Company
• Vaalco Energy
• XTO Energy
• ANCAP
• Petróleos de Venezuela 

Asia

• Azerbaijan International Operating Company
• State Oil Company of Azerbaijan Republic
• Bahrain Petroleum Company
• Petrobangla
• Myanma Oil and Gas Enterprise
• CNOOC
• PetroChina
• Sinopec
• Gujarat State Petroleum Corporation
• Oil and Natural Gas Corporation
• Oil India
• Essar Oil
• Reliance Industries
• MedcoEnergi
• Pertamina
• PT Lapindo Brantas
• National Iranian Oil Company
• North Oil Company
• South Oil Company
• Missan Oil Company
• Midland Oil Company
• Delek Group
• Isramco
• Modiin Energy
• Inpex
• JAPEX
• Nippon Oil
• KazMunayGas
• Kuwait Oil Company
• Consolidated Contractors Company
• Petronas
• Petroleum Development Oman
• Oil and Gas Development Company
• Pakistan Petroleum
• Mari Gas Company
• Petron
• Philippine National Oil Company
• Qatar Petroleum
• Saudi Aramco
• Singapore Petroleum Company
• Ceylon Petroleum Corporation
• Korea National Oil Corporation
• CPC Corporation, Taiwan
• PTT Public Company Limited
• ADNOC
• ENOC
• Petrovietnam
• Vietsovpetro

Australia and Oceania

• BHP Billiton
• Santos
• Woodside Petroleum
• Todd Energy
• Origin Energy

Europe

• OMV
• Petrol AD
• INA – Industrija Nafte
• Moravské naftové doly
• DONG Energy
• Maersk Oil
• Atlantic Petroleum
• Total S.A.
• RWE Dea
• Wintershall
• Hellenic Petroleum
• MOL Group
• Eni
• Ascom Group
• / Royal Dutch Shell
• DNO International
• Statoil
• Grupa Lotos
• PGNiG
• PKN Orlen
• Galp Energia
• Petrom
• Rompetrol
• Bashneft
• Gazprom Neft
• Lukoil
• Rosneft
• Russneft
• Sibir Energy
• Surgutneftegas
• Tatneft
• TNK-BP
• Naftna Industrija Srbije
• Compañía Española de Petróleos
• Repsol YPF
• Lundin Petroleum
• Türkiye Petrolleri Anonim Ortaklığı
• Çalık Enerji
• Ukrnafta
• BG Group
• BP
• Cairn Energy
• Perenco
• Premier Oil
• Salamander Energy
• Stone Enterprises
• Tullow Oil