Crude Petroleum and Natural Gas

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Abraxas Petroleum Corporation

Abraxas Petroleum Corporation, an independent energy company, engages in the acquisition, development, exploration, and production of oil and gas in the United States and Canada. Its oil and gas assets are primarily located in the Rocky Mountain, Mid-Continent, Permian Basin, and Gulf Coast regions of the United States, as well as in the province of Alberta, Canada. As of December 31, 2010, ... more

Apco Oil and Gas International Inc.

Apco Oil and Gas International Inc. operates as an oil and gas exploration and production company with a focus on South America. The company’s principal concessions include Entre Lomas, Bajada del Palo, and Charco del Palenque concessions located in the Neuquen basin, Argentina; and the Agua Amarga exploration permit situated in the Neuquen basin, Argentina. As of December 31, 2009, it has ... more

Approach Resources Inc.

Approach Resources Inc., an independent energy company, engages in the acquisition, exploration, development, and production of oil and gas properties in the United States. The company holds interests in properties primarily located in the Permian Basin in West Texas; East Texas Basin; and Chama Basin in Northern New Mexico. As of December 31, 2010, it owned working interests in 548 producing ... more

BLUE DOLPHIN ENERGY

Blue Dolphin Energy Company, through its subsidiaries, engages in the provision of pipeline transportation and related services for producers/shippers, and exploration and production of oil and gas in the United States. Its pipeline transportation and related services include the operation of the Blue Dolphin Pipeline system, which comprise the offshore segment that transports gas and gas, and ... more

BreitBurn Energy Partners, L.P.

BreitBurn Energy Partners L.P. engages in the acquisition, exploitation, and development of oil and gas properties in the United States. The company’s assets primarily consist of producing and non-producing crude oil and natural gas reserves located primarily in the Antrim Shale and other formations in northern Michigan; the Los Angeles Basin in California; the Wind River and Big Horn Basins ... more

Carrizo Oil & Gas, Inc.

Carrizo Oil & Gas, Inc., together with its subsidiaries, engages in the exploration, development, and production of oil and gas in the United States and United Kingdom. It primarily focuses on proven, producing oil and gas plays in the Barnett Shale in North Texas; the Marcellus Shale in Pennsylvania, New York, and West Virginia; the Eagle Ford Shale in South Texas; the Niobrara Formation in ... more

Clayton Williams Energy, Inc.

Clayton Williams Energy, Inc., an independent oil and gas company, engages in the exploration for and production of oil and natural gas primarily in Texas, Louisiana, and New Mexico. The company owns an interest in and operates natural gas service facilities in the states of Texas, Louisiana, Mississippi, and New Mexico, which consist of interests in approximately 108 miles of pipeline, 4 ... more

Credo Petroleum Corporation

CREDO Petroleum Corporation, together with its subsidiaries, engages in the acquisition, exploration, development, and marketing of oil and gas properties in the Mid-Continent and Rocky Mountain regions of the United States. It operates projects in Texas, Kansas, Wyoming, Colorado, Nebraska, Oklahoma, and North Dakota. The company also involves in developing, testing, refining, and patenting ... more

Crimson Exploration Inc.

Crimson Exploration Inc., an independent energy company, engages in the acquisition, exploitation, exploration, and development of natural gas and crude oil properties primarily in east Texas, southeast Texas, south Texas, Colorado, Louisiana, and Mississippi. As of December 31, 2010, its estimated proved reserves were 166.5 billion cubic feet equivalent, consisting of 135.75 billion cubic ... more

Dorchester Minerals, L.P.

Dorchester Minerals, L.P. engages in the acquisition, ownership, and administration of producing and non-producing natural gas and crude oil royalty, net profits, and leasehold interests in the United States. The company’s net profits interests represent net profits overriding royalty interests in various properties owned by the operating partnership; and royalty properties consist of ... more

Escalera Resources Co.

Double Eagle Petroleum Co., an independent energy company, engages in the exploration, development, production, and sale of natural gas and crude oil primarily in the Rocky Mountain Basins of the western United States. The company’s properties include the Atlantic Rim coal bed natural gas project located in south central Wyoming; the Pinedale Anticline in the Green River Basin of Wyoming; the ... more

Escalera Resources Co.

Eagle Rock Energy Partners, L.P.

Eagle Rock Energy Partners, L.P., together with its subsidiaries, engages in gathering, compressing, treating, processing, transporting, and marketing natural gas and condensate, as well as in fractionating and transporting natural gas liquids (NGL). It also involves in acquiring, developing, and producing oil and natural gas working interests in Alabama and Texas; and acquiring and managing ... more

Eagle Rock Energy Partners, L.P.

EV Energy Partners, L.P.

EV Energy Partners, L.P. engages in the acquisition, development, and production of oil and natural gas properties in the United States. Its properties are located in the Barnett Shale, the Appalachian basin primarily in Ohio and West Virginia; the Mid–Continent areas in Oklahoma, Texas, Arkansas, Kansas, and Louisiana; and the San Juan basin, the Monroe Field in northern Louisiana, as well as ... more