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The Unconventional Hydrocarbon Resources Of Britain's Onshore Basins – Coalbed Methane (CBM)

Department for Energy and Climate Change, December 2012


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Resource information:
Resource IDdecccbm2012
Resource titleThe Unconventional Hydrocarbon Resources Of Britain's Onshore Basins – Coalbed Methane (CBM)
Author(s)BGS
Publication/ sourceDepartment for Energy and Climate Change
Date publishedDecember 2012
Summary text/ abstracthis document will review previous studies, factors of importance in UK coalbed methane (CBM) exploration, the geology of key CBM regions, and their comparison to US productive basins and preliminary resource estimates. However, the document's content is limited by the lack of released well logs, core studies and test data, and the resource estimates are speculative, due to the early stage of UK CBM development. In CBM production, a well is drilled into the coal seam and water is pumped out to lower the pressure in the seam. This allows methane to desorb from the internal surfaces of the coal and diffuse into the cleat, where it is able to flow, either as free gas or dissolved in water, towards the production well. Permeability (imparted mainly by the cleat) is necessary to achieve CBM production. The natural permeability of coal seams can be low, so some CBM wells are stimulated (hydrofractured) to improve connectivity between the borehole and the cleat system. Wells may have many subsurface horizontal or multilateral sidetracks drilled from one surface location to penetrate more coal.
Library categoriesEnergy, Extreme Energy, Land Rights, Toxics, UK Government
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file iconThe Unconventional Hydrocarbon Resources Of Britain's Onshore Basins – Coalbed Methane (CBM) [3.6 megabytes]


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