 It is the major component of natural gas, about 87% by volume.The major source of methane is extraction from geological deposits known as natural gas fields, with coal seam gas extraction becoming a major source (see Coal bed methane extraction, a method for extracting methane from a coal deposit, while enhanced coal bed methane recovery is a method of recovering methane from non-mineable coal seams).It is associated with other hydrocarbon fuels, and sometimes accompanied by helium and nitrogen.