Abu Dhabi National Oil Company

Abu Dhabi National Oil Company (ADNOC). AGIP (Azienda Generale Italiana Petroli) since 1998 ENI-Agip Exploration and Production. Alliance Gas (now: STATOIL). Amerada Hess. Anadarko. Anglo Siberian Oil Company plc. Anonima Petroli Italiana (API) Anzoil ARCO (Atlantic Richfield Company) = BP-Amoco. Aruba Petroleum. Australian Oil & Gas Corporation Ltd. Australian Worldwide Exploration Limited Bay State Gas. BEB (Hannover). Bentec Drilling (Preussag DE). Benton Oil & Gas Company. BG Group (British Gas). Bharat Petroleum. BHP Billiton. BJ Services Company. Black Hills Exploration and Production. Bligh Oil & Minerals (AU). Bow Valley Energy Ltd. (US). BP Amoco ARCO. Bula Resources (Ireland). Cabot Oil & Gas Corporation. Cairn Energy PLC (Scotland). Caltex Petroleum Company. CanArgo Energy. CanBaikal Resources Inc. Chevron. ChevronTexaco. Chieftain International (now: Huntoil). Chinese Petroleum Corporation (Taiwan TW). Compagnie Générale de Géophysique (CGG). CONOCO (US) (incl. Gulf Canada). ConocoPhillips. CSIRO Exploration and Mining. Dana Petroleum plc. Deutag Drilling (Preussag DE) (now: KCA DEUTAG Drilling Limited) Devon Energy Corporation (US) (incl. Santa Fe Snyder Corporation, PennzEnergy). Dominion Exploration & Production. Elf Aquitaine (TOTAL FINA ELF). Empresa Colombiana de Petróleos (ECOPETROL). Empresa Nacional del Petróleo - Chile (ENAP). Encana.

Energy Africa EA. Eni. Enterprise Oil plc. (UK). Equity Oil Company. ESSO Deutschland Evergreen Resources (US) ExxonMobil FINA (now: TotalFinaElf) Fortum Group (FI). Gás de Portugal (now: Galp Energia) Gasum Oy (FI) Gaz de France Geoscience Ltd (UK) German Oil & Gas Egypt (GEOGE) (mostly RWE Dea GmbH) Givot Olam Oil Exploration Israel Gulf Canada (now: Conoco) Halliburton Company Hibernia Hindustan Petroleum Corporation Limited (HPCL) Hunt Oil Company Hurricane Hydrocarbons Ltd. (CA) Husky Oil Iceland Oil Indo-Pacific Energy Ltd (NZ) Institut Francais du Petrole (IFP) Instituto Mexicano del Petrólio Kavernen Bau und Betriebs-GmbH (KBB) KCA Deutag Drilling Limited Kerr-McGee (US) Korea National Oil Corporation (KNOC) Krosno Oil and Gas Enterprise (Poland) Kuwait National Petroleum Company (KNPC) Lasmo (now: ENI). Louis Dreyfus Natural Gas (now: Dominion Exploration & Production). Lukoil. Lundin Oil AB. Maersk Olie og Gas (oil and gas exploration and production). Marathon Oil Company. Max Planck Institut für Kohlenforschung MÜLHEIM a/d RUHR. MMS Petroleum. Mobil (=ExxonMobil) Mosaic Oil Murphy Oil Corporation National Centre for Petroleum geology and Geophysics (AU). Nederlandse Aardolie Maatschappij (NAM). Nederlandse Gasunie. Neste Oy (Finland) = Fortum Group. Nexen Inc. (CA) (formerly Canadian Occidental Petroleum Ltd.). New Zealand Oil & Gas Ltd.

Noble Drilling Corporation. NGI-Norges Geotekniske Institutt. NIS-NAFTAGAS. Norsk Hydro. Novus Petroleum (AU). Occidental Petroleum Company. ODIN Energi ApS (Danmark). Offshore Kazakhstan International Operating Company N.V. (OKIOC). Oil and Natural Gas Corporation India. OMV Erdöl und Erdgas. Onako. P & G Consultores C.A. (Venezuela). PAZ (Israel) Pennzoil Company PERTAMINA Indonesian State Oil & Gas Company Perupetro SA Petrobras Petro Canada Petrodril Petrogal (PT) Petróleos de Venezuela Petróleos Mexicanos Petroliam Naional Berhad (PETRONAS) Petrosys Petrotrin (Petroleum Company of Trinidad and Tobago Ltd) Petroz (AU) Phillips Petroleum Company Premier Oil PTT Exploration and Production Public Company Ltd (Thailand) Qatar General Petroleum Corporation Ramco Energy Plc (Scotland) REPSOL YPF RWE RWE-DEA RWE-DEA Norge Saga Petroleum = Norsk Hydro Santos Saudi Aramco Schlumberger Shell International || Shell NL || FR || DE || UK || CH Shell (US) SINTEF Petroleum Research (Trondheim NO) Staatsolie (Suriname) Statoil Talisman energy (CA) TAMOIL Tap Oil Techdrill International Teikoku (JP)

Texaco Tokyo Gas TotalFinaElf TransCanada Triton (US) Turkish Petroleum Corporation (TPAO) Tyumen Oil Company UNOCAL VEBA Oel (Gelsenkirchen) VEBA Oel und Gas (Essen) - früher u.a. Deminex GmbH (now: mostly Petro-Canada) Wingas GmbH Wintershall AG (BASF) Wintershall Nederland