British Gas
Burlington Resources
Chevron
Energie Beheer Nederland
Exxon Mobil
Gas Unie
Kerr McGee
Matrix
Nederlandse Aardolie Maatschappij
ONGC Videsh
Petroleum Development Oman
Shell International Exploration and Production
SEIC, Sakhalin
Statoil
Talisman
Total
Wintershall Noordzee BV