A coal formation may be treated using an in situ thermal process. A mixture of hydrocarbons, H2, and/or other formation fluids may be produced from the formation. Heat may be applied to the formation to raise a temperature of a portion of the formation to a pyrolysis temperature. Heat may increase a...http://www.google.com/patents/US6866097?utm_source=gb-gplus-sharePatent US6866097 - In situ thermal processing of a coal formation to increase a permeability/porosity of the formation
