Operator List: O

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O'Brien Energy Resources Corp. O'Brien, Owen Oak Ridge LLC Ocean Energy, Resources, Inc. Oil Partners, LLC Oil Producers, Inc. of Kansas Oil Property Management, Inc. Oil Tech Producers Corporation Ol' Oily LLC OLAK Energy Production, LLC

Olympic Oil, Inc. One Source Financial Services Inc. Oolite Energy Corp OPCO LLC Opdycke Lease Partners, a General Partnership Orca Operating Company LLC Osage Energy, LLC OSAGE Resources, LLC Osborn Heirs Company, LTD Outlaw Well Service LLC

Overland Exploration Company Owen's Pumping Service Owens Oil Company, LLC Owens Petroleum LLC Own Resources Operating LLC OXY USA Inc.