| Anadarko Petroleum |
|
Japan Petroleum Exploration (JAPEX) |
|
Petroquest Energy |
| Andra |
|
Japan Oil, Gas and Metals National Corporation (JOGMEC) |
|
Repsol YPF |
| Anglo Peruana |
|
Kuwait Institute for Scientific Research (KISR) |
|
Rogaland Research |
| BG Group |
|
Korea National Oil Corporation |
|
RPS Energy |
| BHP Billiton |
|
Kuwait Oil Company |
|
Sasol |
| BP |
|
Lundin Petroleum |
|
Royal Dutch Shell |
| BRGM |
|
Maersk Oil |
|
Statoil |
| Cairn Energy |
|
Marathon Oil |
|
StatoilHydro |
| Dana Petroleum |
|
Melrose Resources |
|
Sterling Energy |
| DONG Energy |
|
Murphy Oil |
|
Suncor Energy |
| GDF Suez |
|
Murphy Oil Australia |
|
TNK-BP |
| Gulfsands Petroleum |
|
OMV |
|
Wintershall |
| Heritage Oil Plc |
|
Orion Petroleum Ltd |
|
Talisman Energy |
| Hess Corporation |
|
Pakistan Oil Field Ltd |
|
DNO International |
| Hunt Oil |
|
Petróleos Mexicanos (PEMEX) |
|
|
| Hydro |
|
Petróleo Brasileiro (Petrobras) |
|
|
| |
|
|
|
|
