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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Variations of methane concentration in coal appear to correlate well with the optical anisotropic properties of the coal. Some medium- and low-volatile bituminous coal beds in the Appalachian coal basin vary in methane concentration by 5 to 10 times; their optical 
anisotropy
also varies by 2 to 3 times. High-volatile bituminous coals of Appalachian basin tend to contain more methane than bituminous coals of similar rank in the Rocky Mountain region. The Pennsylvanian Appalachian coals are also more anisotropic than the Cretaceous Tertiary Rocky Mountain coals. The technique can thus be used as an exploration tool for potential coal gas reservoirs.
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