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. An average temperature
and/or pressure within the formation may be controlled to inhibit production of
hydrocarbons that have carbon numbers greater than a selected carbon number. In
some embodiments, the selected carbon number is 25. A small number of hydrocarbons
having carbon numbers greater than the selected carbon number may be entrained
in vapor produced from the formation.
