TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The heat from heat sources is controlled so that an average temperature within the selected section of the formation is less than 375, preferably less than 370degreesC. The heat is controlled so that an average heating rate of the section is less than 1degreesC/day during pyrolysis. The heat is provided from the heat sources to the portion of formation by heating a selected volume (V) of the hydrocarbon containing formation from heat sources where the formation has an average heat capacity (Cv). The heating energy/day provided to the volume is equal to less Pwr, where Pwr is calculated by Pwr = hasteriskVasteriskCvasteriskrho-B, where Pwr is the heating energy/day, h = average heating rate of the formation, rho-B is formation bulk density, and the heating rate is less than 10degreesC/day. The selected portion is heated such that a thermal conductivity is greater than 0.5 W/(mdegreesC). The pressure is controlled to at least 2 bar absolute. The pressure is altered within the formation to inhibit production of hydrocarbons from the formation having carbon numbers greater than 25. The heat is transferred to increase permeability of the selected portion to greater than 100 millidarcy. The heat is controlled to yield greater than 60 wt.% condensable hydrocarbons, measured by Fischer assay. The minimum pyrolysis temperature is 270degreesC. The pressure is controlled within the formation from atmospheric pressure to 100 bar, as measured at a wellhead of a production well to control an API gravity of condensable hydrocarbons within the produced mixture. The pressure is reduced to decrease the API gravity. The vaporization temperature is less than approximately 450degreesC at atmospheric pressure. The provided heat comprises approximately 650-1650 W/m.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The heat sources comprise at least two heat sources, and where the superposition of heat from at least two heat sources pyrolyzes the hydrocarbons within the selected section of the formation. They also comprises electrical heaters, surface burners, flameless distributed combustors and natural distributed combustors. The system further comprises a lead-in conductor coupled to insulated conductor. The insulated conductor comprises a conductor disposed in an electrically insulating material. The system further comprises an overburden casing coupled to the opening and is disposed in an overburden of a formation. A packing material is disposed at a junction of the overburden casing and the opening. The system comprises a centralizer to maintain location of first and second conductors.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The produced mixture comprises condensable hydrocarbons having an American Petroleum Institute (API) gravity of at least 25degrees.Preferred Composition: 0.1-15 wt.% of the (non)condensable hydrocarbons are olefins. The mole ratio of ethene to ethane in the non-condensable hydrocarbons is 0.001-0.15. Less than 0.1 wt.% condensable hydrocarbons, when calculated on an atomic basis is nitrogen or oxygen. 5-30 wt.% Condensable hydrocarbons comprise oxygen containing compounds with phenols. Less than 1 wt.% condensable hydrocarbons is sulfur. Greater than 20 wt.% Condensable hydrocarbons are aromatic compounds. Less than 0.5 wt.% condensable hydrocarbons comprises multi-ring aromatics with more than two rings. Less than 0.3 wt.% condensable hydrocarbons are asphaltenes. 5-30 wt.% condensable hydrocarbons are cycloalkanes.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Property: The hydrogen is greater than 10 vol.% or less than 80 vol.% non-condensable component. The produced mixture comprises a partial pressure of hydrogen gas within the mixture greater than 0.5 bar.Preferred Composition: The produced mixture comprises 0.05 wt.% ammonia that is used to produce fertilizer.Preferred Components: The lead-in conductor comprises copper (Cu) wire. The insulating material comprises aluminum oxide or magnesium oxide with a thickness of at least 1 mm. The oxidant comprises hydrogen peroxide, air or a fluid that is free of nitrogen.    TECHNOLOGY FOCUS - METALLURGY - Preferred Component: The insulated conductor comprises a Cu-nickel (Ni) alloy. The sheath, conduit, and centralizer comprise stainless steel.Preferred Composition: The Cu-Ni alloy comprises approximately 7-12, preferably 2-6 wt.% Ni.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The lead-in conductor comprises a rubber-insulated conductor.    TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Material: The packing material comprises cement. The centralizer comprises ceramic material.