• Superior Gas Compression, LLC
• Escambia Asset Co. LLC
• Escambia Operating Co. LLC
• Eagle Rock Acquisition Partnership II, L.P.
• Eagle Rock Upstream Development Co II, Inc.
• Eagle Rock Energy Acquisition Co. II, Inc.
• Eagle Rock Upstream Development II, L.P.
• Eagle Rock Acquisition Partnership, L.P.
• Eagle Rock Upstream Development Company, Inc.
• Eagle Rock Energy Acquisition Co., Inc.
• Hesco Pipeline Company, L.L.C.
• Hesco Gathering Company, LLC
• EROC Gathering Company, LP
• EROC Quitman Gathering Co., LP
• EROC Midstream Energy, L.P.
• Eagle Rock Development Company, L.L.C.
• Eagle Rock Production, L.P.
• EROC Production, LLC
• Eagle Rock Field Services, L.P.
• Eagle Rock Operating, L.P.
• Eagle Rock Gas Gathering & Processing, Ltd.
• Midstream Gas Services, L.P.
• Eagle Rock Pipeline, L.P.
• Eagle Rock Pipeline GP, LLC
• Eagle Rock Energy Services, L.P.
• Eagle Rock Energy Finance Corp.
• Bison Ranch LLC
• HK Energy Marketing, LLC
• One Tec Operating, LLC
• One Tec, LLC
• Mewbourne Energy Partners 09-A, L.P.
• Talos Resources LLC
• Rosetta Resources Michigan Limited Partnership
• Rosetta Resources Operating LP
• Rosetta Resources Holdings, LLC
• Rosetta Resources Operating GP, LLC
• Rosetta Resources Offshore, LLC
• Pecos Pipeline LLC
• Chama Pipeline Holding LLC
• Geopark Ltd
• VNR Finance Corp.
• Breitburn Operating LP
• Breitburn Operating GP LLC
• Breitburn Finance Corp
• Geokinetics International Holdings, Inc.
• Geokinetics Services Corp.
• Geokinetics Management, Inc.
• Geokinetics International, Inc.
• Geokinetics USA, Inc.
• Geokinetics Processing, Inc.

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