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Abu Dhabi National Oil |
Enron Oil & Gas | Ormonde Energy |
| ADMA-OPCO | ENSR | Paladin Resources |
| ADTI | EOG Resources | PanCanadian |
| Afren plc | EON Ruhrgas | Peak Group |
| African Arabian | Equator Exploration | Peak Petroleum Nigeria |
| Agip | Europa Oil and Gas | Pegasus International (UK) Ltd |
| Alberta Energy | ExxonMobil | Perenco |
| Allis-Chalmers Corporation | Exxon Neftegas Ltd | Petrobras |
| Amerada Hess | Faroe Petroleum | PetroCanada |
| Amromco Energy | Fina Oil | PESGB |
| Anadarko | Force Petroleum | Phillips Petroleum |
| Anglo Albanian Petroleum | Foundation Energy Ltd | Plectrum Petroleum |
Antrim Energy |
Fusion Oil and Gas Plc | Port of London Authority |
| Apache | Global Maritime | PowerGen |
| API | GdF | Premier Oil |
| Arco International | Genesis | PricewaterhouseCoopers |
| Athanor Tunisia B.V. | Global Santa Fe | Purbeck |
| Atlantis | Goland Petroleum | Ranger Oil |
| ATP Oil & Gas | Granby Oil and Gas | Reach Exploration |
Bankers Petroleum |
Gulf Keystone | Reliance Industries |
| Bechtel | Hardy Oil & Gas | RGIT Montrose |
| BHP Petroleum | Hess | RWE Dea |
| BHPBilliton | HR Wallingford | Sakhalin Energy Investment Company |
| Blue Water Industries | Huang Long JOC | Saga Petroleum |
| Bow Valley | Humber Power | SAGES Solutions |
| BP | Hunt Oil | Samson Investment |
| Bridge Resources | Hurrican Exploration | Santa Fe Snyder |
| British Airways | Hydrocarbon Resources Ltd | Sasol Petroleum |
| British Borneo | Hydrosearch | Saxon Petroleum |
| British Gas | Inchcape | Serica Energy |
| BG International | International Finance Corporation | Shell Brazil |
| Brovig | IPIECA | Shell Expro |
| Burlington Resources | Ithaca Energy | Shell Middle East |
| BTC Pipeline Company | Intrepid Energy | Shell UK |
| Cairn Energy | JAPEX | Silverstone Energy |
| Caithness Oil | J.M. Huber | SOCO International |
| CalEnergy | KCADeutag | Sonahess |
| Canadian Natural Resources | Kelt Energy | Sonangol |
| Caledonia Oil and Gas | Knightsbridge Petroleum | Sonatrach |
| Carrizo Oil and Gas | KNOC | Spheros Technologies |
Challenger Minerals |
Kerr McGee | Stag Energy |
| CDS Ltd | LASMO | Star Energy |
| Centrica Resources | LASMO Pakistan | Statoil |
| Century Exploration | London Underground | Sterling Resources |
| ChevronTexaco | Marathon Oil | Stone and Webster |
| Crescent Petroleum | Mart Resources | Stratic Energy |
| ConocoPhillips | MMS (US) | Sussex Energy |
| Consort Resources Ltd | MMS Petroleum | Svenska Petroleum Exploration UK Ltd |
| Corsair | MODEC | Talisman Energy |
| CSM | Murphy Petroleum | Texaco |
| Dana Gas | Nautical Petroleum | TotalFinaElf |
| Dana Petroleum | Newfield Petroleum | Total Oil Marine |
| Desire Petroleum | Nexen | Total E & P (UK) plc |
| Devon Energy | Nimir Petroleum | Tower Resources |
| DNO | Nippon Oil | Transatlantic Holdings |
| DWA | Noble Energy | Triton |
| Crescent Petroleum | Northcroft | Tullow Oil |
| Eclipse Energy | Northstar Energy | Tuscan Energy |
| Egdon Resources | NSRD | UKOOA |
| El Paso | Ocean Energy | Vaalco Energy |
| Elixir Petroleum | Odebrecht Oil and Gas | Vanco Energy |
| Emanate Consultants Ltd | Office Angels | Venture Production |
| Endeavour Energy | Offshore Wind Power Ltd | Veritas DGC |
| Energy North Sea | OilExCo | Vitol |
| ENI | OGP (formerly E&P Forum) | Wham Energy |
| EnCana | OMV | Wintershall |
| EnCore Oil and Gas | ONGC | XTO Energy |
| Enterprise Oil | Origin Energy | ZADCO |
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