A basin-wide coalbed methane reservoir model of the Colorado portion of the San Juan Basin. This model, which is referred to as the 3M CBM MODEL, simulates the effects of production from all existing and proposed Fruitland coal wells in Colorado. The effects of dewatering, gas adsorption and desorption, and historical production are included in the model. The 3M CBM MODEL provides a tool to evaluate the effects of coalbed methane infill drilling and gas seepage at the outcrop.