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. A heating rate to a...http://www.google.co.uk/patents/US6749021?utm_source=gb-gplus-sharePatent US6749021 - In situ thermal processing of a coal formation using a controlled heating rate
