A coal formation may be treated using an in situ thermal process. 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 input into the formation may...http://www.google.co.uk/patents/US6607033?utm_source=gb-gplus-sharePatent US6607033 - In Situ thermal processing of a coal formation to produce a condensate
