The basin is dominated by underpressure and hydrocarbon-related overpressure, indicating low overall permeability. The Cameo coal group contains 65 tcf of coalbed methane, out of the basin s total resources of 84 tcf. Cumulative coalbed methane production is 21,022 mmcf. Powder River Basin. The primary exploration target is the Tongue River Member of the Fort Union Formation.
Coal seams are large aquifers, and are difficult to dewater.
The basin s main coal-bearing units are the Vermejo and Raton Formations. The basin is regionally underpressured, reflecting insulation from recharge and coal-seam lenticularity. The coalbed methane resource is estimated at between 8.4 and 12.1 tcf. Only 53.9 mmcf of coalbed methane has been produced in the basin. Kentucky Geological Survey 228 Mining and Mineral Resources Bldg.