An oil shale 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...http://www.google.de/patents/US6923257?utm_source=gb-gplus-sharePatent US6923257 - In situ thermal processing of an oil shale formation to produce a condensate
