A hydrocarbon containing 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. The...http://www.google.de/patents/US6715549?utm_source=gb-gplus-sharePatent US6715549 - In situ thermal processing of a hydrocarbon containing formation with a selected atomic oxygen to carbon ratio
