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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




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7 march 2011 enzmann@uni-mainz.de