Temperature logs and heat-flow data from wells in the northern San Juan basin, Colorado-New Mexico, suggest that coals of the Fruitland Formation are an aquifer with appreciable horizontal ground-water movement. Calculated hydraulic conductivities, based on ground water flow rates estimated from heat-flow data, are several orders of magnitude greater than hydraulic conductivities measured in laboratory or pumping tests. Fractures and other preferential pathways probably create high regional hydraulic conductivity that allows significant heat advection.

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