Abaco Operating LLC
Anadarko Petroleum
Amity Oil Limited
Antero Resources
Apache Corporation
ARC Resources
Atlas Energy
Bass Energy Production Company
BHP-Billiton
BJ Services
Bomber Mountain Resources LLC
Bonanza Creek Oil Co. LLC
BP Amoco Exploration and Production
BP Canada Energy Company
Burlington Resources
Cabot Oil & Gas
Calfrac Well Services, Corp.
Callon Petroleum
Canadian Natural Resources Ltd.
Chevron Cimarex Energy Co
ConocoPhillips
Continental Resources
Core Lab
Cornerstone E&P
Corridor Resources
Davis Petroleum Corp
Devon Canada Corportation
Devon Energy
DRM Energy
Duvernay Oil Corp
EEX
El Paso Production
Ellora Energy
EnCana Corporation (Canada)
EnCana Oil & Gas (Canada)
EnCana Oil & Gas (USA)
Enduring Resources
Enterprise Energy Ireland
EOG Resources
Exaro Energy LLC
FIML Natural Resources
Forest Oil Corporation
G2 Resources Inc
Gasco Energy
Gulf Exploration & Production
Halliburton Australia
Halliburton Energy Services
Hess Corporation
Higgs-Palmer Technologies LLC
Houston Energy L.P.
HS Resources
iReservoir.com
IOR Enterprises
Kaler Energy Corp
Kerr McGee Oil & Gas Onshore LP
Lewis Energy
Lucas Energy (Australia)
Maersk Olje og Gass A/S
Makoil Inc.
Marathon Oil Company
Merrion
Metano Energy, LP
Murphy Oil Company
Nexen
Noble Energy Production
Norton Proppants
Object Reservoir
Occidental Oil & Gas
Origin Energy
Oxy Permian Ltd
Par-A-Sol Chemical Inc.
Patina Oil & Gas
Perenco Holdings Ltd.
Petrobras
Resource Services International Inc
Rocky Mountain Association of Geologists
Rosetta Resources Inc
Rover Resources Inc
Samson Resources
Santos Ltd.
Sedna Energy
Shell Canada Ltd
Shell Exploration & Production Company
Sklar Exploration LLC
SPE Canadian Section
Special Core Analysis Laboratories Inc
Stim Lab
Stone Energy
Talisman Energy Inc
Taurus Reservoir Solutions
Texas Crude Energy
The Society of Petroleum Engineers
Trident Exploration Corp
UNOCAL
Vindum Engineering Inc
Walsh Production Inc
Weatherford Canada
Western Gas Resources Inc
Whicher Range Gasfields Ltd
Whiting Petroleum Corp
Williams Production Company
Yates Petroleum Corporation
Zinc and Trumbo Canada Corp.