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Cahaba Basin
The Cahaba Basin is a geologic area of central Alabama developed for coal and coalbed methane (CBM) production.〔http://www.gsa.state.al.us/documents/oginfo/cbm.pdf Alabama State Oil and Gas Board; Coalbed Methane Resources of Alabama〕 Centered in eastern Bibb and southwestern Shelby Counties, the basin is significantly smaller in area and production than the larger Black Warrior Basin in Tuscaloosa and western Jefferson Counties to the northwest.〔http://www.gsa.state.al.us/img/mapf7.jpg Alabama State Oil and Gas Board; Oil and Gas Regions Map〕 The coalbed methane is produced from the Gurnee Field of the Pottsville Coal Interval. Coalbed gas production has been continuous since at least 1990 and annual gas production has increased from 344,875 Mcf in 1990 to 3,154, 554 Mcf through October 2007.〔http://www.gsa.state.al.us/ogb/db_field.aspx Alabama State Oil and Gas Board; Fields & Pools Database〕
==Geology==
The Cahaba Basin is located across an anticline from the neighboring Black Warrior Basin. Within the Cahaba Basin, the Pennsylvanian Age coal beds have an average bed thickness of 50 feet.〔http://www.geometinc.com/ir/documents/bofaenergyconfnov07.pdf; GeoMet, Inc.; Bank of America 2007 Energy Conference, November 16, 2007〕 The developed formations are known as the Gurnee Field of the Pottsville Formation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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