• Sky Petroleum, Inc.
• Sierra International Group Inc
• Sovereign Chief Ventures Ltd
• Superior Oil & Gas Co
• Colorado 2002A Limited Partnership
• Pdc 2002 B Ltd Partnership
• Pdc 2002 C Ltd Partnership
• Pdc 2002 D Ltd Partnership
• Austin Developments Corp
• Digital Utilities Ventures Inc
• Paramount Resources Ltd
• Ridgewood Energy K Fund LLC
• Ridgewood Energy L Fund LLC
• Black Raven Energy, Inc.
• Ridgewood Energy M Fund LLC
• Seitel Solutions, Ltd.
• Si Holdings, G.P.
• Global Geophysical Services Inc
• Gulf United Energy, Inc.
• Ridgewood Energy O Fund LLC
• Whiting Canadian Holding Co ULC
• Ridgewood Energy P Fund LLC
• Cgg Americas Inc.
• Sercel Inc.
• Reostar Energy Corporation
• Ridgewood Energy Q Fund LLC
• Colorado Utah Natural Gas, Inc.
• Dominovas Energy Corp
• Unbridled Energy CORP
• Energy XXI Ltd
• Consolidated Oil & Gas, Inc.
• Ridgewood Energy S Fund LLC
• Sentry Petroleum Ltd.
• Alamo Energy Corp.
• Ridgewood Energy T Fund LLC
• Pacific Asia China Energy Inc.
• Power Resource Exploration Inc.
• Performance Drilling Co LLC
• Ridgewood Energy U Fund LLC
• Ridgewood Energy V Fund LLC
• Cgg Land (U.S.) Inc.
• Veritas Geophysical (Mexico) LLC
• Cgg Services (U.S.) Inc.
• Alitheia Resources Inc.
• Veritas DGC Asia Pacific Ltd.
• Veritas Investments Inc.
• Viking Maritime Inc.
• Falconridge Oil Technologies Corp.
• Cardinal Energy Group, Inc.
• Ridgewood Energy W Fund LLC

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