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. A formation to be treated
may produce a relatively large amount of condensable hydrocarbons and/or a relatively
large amount of non-condensable hydrocarbons. Hydrocarbons within the formation
may have a relatively high initial elemental hydrogen weight percentage.
