Abstract
ABSTRACT The Piceance Basin in northwestern Colorado contains the largest concentration of coalbed methane in the U.S. A detailed geologic analysis of the basin shows that the basin contains 84 Tcf of coalbed methane in-place. The east-central area of the basin contains the greatest volume of resource and is a potentially promising area for gas recovery due to its proximity to structural deformation and consequent permeability enhancement. The geologic analysis compiled extensive well data to correlate and map the subsurface extent of the Cretaceous age coals thereby determining coal volumes. Newly derived correlations of coal rank/depth with gas content were used along with coal volume to estimate in-place gas.
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