Amerada Hess Corp.
Ampolex
Applied Computer Engineering, Inc.
Arco E&P Technology
ANR Pipeline
Ashland Exploration
Apache Corporation
Baker Hughes
Cabot Oil & Gas
ChevronTexaco
Computalog
Devon Energy
Digi-Rule
Digital Formation
Discovery Group, The
Ecopetrol
EDC (Europe) Limited
EEX Corporation
Elf Petroland
Energy Data Services
Energy Partners Ltd.
Enron Oil & Gas Corp.
Epoch Well Logging
Fletcher Challenge Energy
Forest Garb
Geofizyka Krakow Sp. z o.o.
GeoMechanics International
Geoquest
Geoservices
GEUS
Gulf Canada Resources
Halliburton
H.A.R.C.
Idemitsu
IHS Energy
Instituto Mexicano Del Petroleo
ITS
Kerr McGee
Landmark Graphics Corp.
Logtek a.s.
MOL Syria Oil & Gas Company, B.V.
Marathon Oil
Maraven
Maxus Energy
MID-CON Data Services, Inc.
Minerals Management Service
Mitchell Energy
Numar, Inc.
Ocean Energy
Ovation Data Services
Occidental of Elk Hills
PanCanadian Petroleum Limited
Petris Technology, Inc.
Petro Log
PetroSantander, Inc.
P.O.S.C.
Randall & Dewey
ResTech
Robertsons Research International
Ryder Scott Company
SAIC
SaudiAramco
Sante Fe Energy
Seagull Energy
Shell Oil
SoftChoice Corporation
Spectrum Geophysical
Sperry-Sun Drilling Services
Statoil
Stratagraph
Talisman
Torch Energy
Union Pacific Resources
University of Kansas
University of Melbourne
University of Tulsa
Unocal
Wintershall
Zilkha Energy