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. The portion may be allowed or forced...http://www.google.de/patents/US6763886?utm_source=gb-gplus-sharePatent US6763886 - In situ thermal processing of a coal formation with carbon dioxide sequestration
In situ thermal processing of a coal formation with carbon dioxide sequestration