What is coalbed gas?
Coalbed Gas (CBG) is the natural gas found in most coal deposits. CBG is created during coalification, the process by which plant material is converted into coal over millions of years. Under most circumstances CBG consists of pure methane though it may also contain minor amounts of carbon dioxide and nitrogen. CBG exists primarily within the coal seam where it is adsorbed (attached) to the coal. Pressure from the overlying rock and the water within the coal cleats (fractures) keeps the methane adsorbed onto the coal.
