- Adelaide Energy
- Akorn International
- Alcoa
- Amerada Hess
- Anadarko
- Anzoil Thailand
- Anzon Energy
- Apache Energy
- ARC Energy
- Arete
- Audax
- Ausoil
- Austral-Asia
- AWT
- Baraka Petroleum Limited
- Black Swan Petroleum (Thailand)
- Bounty Oil & Gas NL
- Brimax
- Cairn Energy
- Cape Energy
- Central Asian Petroleum (HKG)
- Central Petroleum
- ChevronTexaco
- Continental Energy Corp
- Coogee Resources
- Cooper Energy
- Department of Energy & Recources
- Eagle Bay Resources
- Empire Oil
- Global International
- Gujarat
- GX Technology
- Hardman Resources
- Harlow
- Helix
- Hess
- Holloman Oil & Gas
- Idemitsu
- Japet
- Japex
- Jubilee Oil NL
- Japan Energy Development
- Jubuliant
- Jupiter
- Kingsway
- KNOC
- Kufpec
- Lakes
- Landmark
- Macquarie Bank
- Markmore Energy
- Methanex
- Mitwell
- MPR
- Murphy
- Nido Petroleum
- Nippon Oil Exploration Limited
- Nukoil NL
- Octanex / Strata
- Oil India
- Oil Search
- Oilex NL
- Omax Resources
- OMV
- Ophir
- Orion
- Otto
- P & R Geological Consultants
- Petronas
- Petrosys
- PGS
- ConocoPhillips
- Phoenix
- Plantagenet Resources Ltd
- Premier Oil
- PT Energi Mega Persada
- PTTEP
- Reliance
- Renewable Energy Corp
- Resource Systems
- RISC
- Salamander
- Salinas Energy
- Sasol
- Seismic Australia
- Shell
- Strike Oil
- Sun Resources NL
- Sundance Energy LLC
- Talisman
- TAP Oil
- Tepco Australia
- TGS - Nopec
- Tokyo Timor Sea Resources
- Veritas DGC
- Voyager
- Western Geko
- Westoil NL
- Westpac
- Woodside
