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Geologic and hydrologic characterization of coalbed-methane reservoirs in the San Juan basin. W.R. Kaiser and W.B. Ayers. SPE Formation Evaluation, September 1994, 9(3), 175--184.

An integrated analysis of geology and hydrology is presented of the world's most prolific coalbed methane producing area. Fruitland coals are best developed in the north-central part of the San Juan basin. Hydrologic studies characterized reservoir conditions such as permeability and pressure regime, and in geologic characterization the stratigraphy, structural setting, and occurrence of Fruitland coal seams are discussed. The interaction of geology and hydrology is simulated to explain the Fruitland hydrodynamics. In an integration of geology and hydrology, the San Juan basins are divided into regions with similar reservoir characteristics and optimal conditions for the production of coalbed methane are defined. 20 refs.

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