TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The heat sources are installed by drilling openings using a steerable motor and accelerometer, geosteered drilling, or sonic drilling. The controlling step includes controlling pressure, formation conditions, heat and/or heating rates of a selected section of formation. The pressure is altered to inhibit production of hydrocarbons having carbon numbers greater than 25. Heat is transferred by conduction to increase a permeability of the selected section to greater than 100 millidarcy. The method further comprises providing hydrogen to the heated section to hydrogenate hydrocarbons within the section, and heating a portion of the section with heat from hydrogenation. The produced mixture is separated into an aqueous stream and a non-aqueous stream. An oxidant may also be flowed from the conduit to the hydrocarbons. Synthesis gas generation is provided at 400-1200, preferably 700 degrees C. The produced synthesis gas may be passed through a turbine or to a fuel cell to generate electricity. It may also be converted to methanol, gasoline or methane.Preferred Properties: The selected section has a thermal conductivity of 0.5 W/(m degrees C).Preferred Parameters: A heating energy/day provided to a volume of the section is at most Pwr, which is calculated by the equation Pwr = h x V x cv x rhoB, where Pwr is the heating energy/day, h is an average heating rate of the formation and is less than 10, preferably less than 1 degrees C/day, and rhoB is formation bulk density. The controlled pressure is at least 2.0 bar absolute. The minimum pyrolysis temperature is 270 degrees C. The pressure for an assessed average temperature (T) in the selected section is defined by p = e-(-44000/T+67), p = e-(-31000/T+51), or p = e-(-22000/T+38) when American Petroleum Institute (API) of the produced mixture is controlled to be greater than 25, greater than 30, or greater than 35 degrees API, respectively; where p is measured in psia and T is measured in Kelvin. The pressure for the selected section may also be defined by: p = e-(-38000/T+61), p = e-(-13000/T+24), or p = e-(-8000/T+18), when the atomic hydrogen to carbon ratio of the product mixture is controlled to be greater than 1.7, greater than 1.8, or greater 1.9, respectively.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compositions: The produced mixture comprises condensable hydrocarbons and non-condensable hydrocarbons, both comprising 0.1-15 wt.% olefins. The condensable hydrocarbon comprises 5-30 wt.% oxygen containing compounds comprising phenols, 5-30 wt.% cycloalkanes, greater than 20 wt.% aromatic compounds, less than 5 wt.% multi-ring aromatics with more than two rings, less than 1 wt.% nitrogen, less than 1 wt.% oxygen, less than 1 wt.% sulfur, and/or less than 0.3 wt.% asphaltenes. The non-condensable component comprises greater than 10 wt.% and less than 80 wt.% hydrogen. The non-condensable hydrocarbons comprises hydrocarbons having carbon number less than 30, less than 25, or less than 5. A weight ratio of the hydrocarbons having carbon numbers 2-4 to methane is greater than approximately 1. The mixture may also comprise hydrogen, carbon dioxide, hydrogen sulfide, and/or greater than 0.05 wt.% ammonia. A mole ratio of ethene to ethane in the non-condensable hydrocarbons is 0.001-0.15.Preferred Properties: The produced mixture comprises a partial pressure of H2 within the mixture greater than 0.5 bar.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The heat source comprises electrical heater, surface burner, flameless distributed combustors, or natural distributed combustors. The unit of heat sources comprises a triangular pattern. The conduit comprises orifices, preferably critical flow orifices. A center conduit may be disposed within the conduit configured to provide the oxidizing fluid during use. A conductor may also be disposed in a second conduit that is disposed within the opening. The conductor provides approximately 500-1650 W/m heat. It may also be disposed in an electrically insulating material. A heat exchanger is disposed external to the formation. The formation is a deep hydrocarbon containing formation over 760 m below ground surface.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The conductor comprises stainless steel. The synthesis gas generating fluid comprises liquid water or steam. It may comprise water and carbon dioxide removed from the formation. The oxidant comprises hydrogen peroxide, air, or fluid that is free of nitrogen. The conductor comprises copper-nickel alloy. The insulating material comprises aluminum oxide or magnesium oxide.Preferred Ratio: The ratio of H2 to carbon monoxide of the synthesis gas is 1.8:1-2.2:1, preferably 2:1, or 2.8:1-3.2:1, preferably 3:1.