NOVELTY - In situ treatment of hydrocarbon containing formation comprises providing heat from heat source(s) to at least one portion of the formation; allowing heat to transfer from heat source(s) to a selected section of formation; controlling the heat from heat source(s) so that average temperature within majority of selected section is less than 375degreesC; and producing a mixture from formation.    USE - The method is used for in situ treatment of hydrocarbon containing formation to produce hydrocarbons, hydrogen, and/or other product streams from underground hydrocarbon containing formations. A heated formation may be used to produce synthesis gas, which is converted by Fischer-Tropsch hydrocarbon synthesis to branched and unbranched paraffins used to produce other products as diesel, jet fuel, and naphtha products. The produced synthesis gas may be used on catalytic methanation process to produce methane, or may be used for production of methanol, gasoline and diesel fuel, ammonia, and middle distillates. Produced synthesis gas may be used to heat the formation as a combustion fuel, and hydrogen in the produced synthesis gas may be used to upgrade oil. Synthesis gas may be combusted as fuel and may be used for synthesizing organic and/or inorganic compounds such as hydrocarbons and ammonia. It may be used to generate electricity, by combusting it as a fuel, by reducing the pressure of the synthesis gas in turbines, and/or using the temperature of the synthesis gas to make steam (and then run turbines). It may also be used in an energy generation unit such as molten carbonate fuel cell, or solid oxide fuel cell.    ADVANTAGE - The method economically produces hydrocarbons, hydrogen, and/or other products from hydrocarbon containing formations. Energy input costs may be reduced by heating a portion of a hydrocarbon containing formation by oxidation in combination with heating the portion of the formation by an electric heater, which may be turned down and/or off when the oxidation reaction begins to provide sufficient heat to the formation.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method for forming heater wells in a hydrocarbon containing formation comprising:    (1) forming a first wellbore in the formation;    (2) forming a second wellbore in the formation using magnetic tracking such that the second wellbore is arranged parallel to the first wellbore; and    (3) providing at least one heating mechanism within the first wellbore and at least one heating mechanism within the second wellbore such that the heating mechanism can provide heat to at least a portion of the formation;    (2) a system configured to heat a hydrocarbon containing formation comprising:    (1) a heater disposed in an opening in the formation, where the heater is configured to provide heat to at least a portion of the formation during use;    (2) an oxidizing fluid source; and    (3) a conduit disposed in the opening, where the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and where the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone, and where the system is configured to allow heat to transfer by conduction from the reaction zone to a pyrolysis zone of the formation during use;    (3) a system for heating a hydrocarbon containing formation comprising:    (1) a heater disposed in an opening in the formation;    (2) an oxidizing fluid source; and    (3) a conduit disposed in the opening for providing an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use;    (4) a composition produced from a portion of a hydrocarbon containing formation, comprising:    (1) less than 10 wt.% olefin; and    (2) less than 35 average carbon number;    (5) a mixture prepared from a portion of a hydrocarbon containing formation comprises:    (1) non-condensable hydrocarbons comprising hydrocarbons having carbon numbers of less than 5, wherein a weight of ratio of hydrocarbons having carbon numbers from 2 - 4, to methan, is greater than approximately 1; and    (2) condensable hydrocarbons comprising oxygenated hydrocarbons of about 5% by weight of condensable component.    (6) a method for in situ production of synthesis gas (823) from a hydrocarbon containing formation comprising:    (1) heating a section of the formation to a temperature to allow synthesis gas generation, where permeability of the section is uniform and greater than a permeability of an unheated section of the formation when the temperature sufficient to allow synthesis gas generation within the formation is achieved;    (2) providing a synthesis gas generating fluid to the section to generate synthesis gas; and    (3) removing synthesis gas from the formation;    (7) a method of forming a spent portion of formation within a hydrocarbon containing formation, comprising:    (1) heating a first portion of the formation to pyrolyze hydrocarbons within the first portion and to establish a substantially uniform permeability within the first portion; and    (2) cooling the first portion.    (8) method of sequestering carbon dioxide within a hydrocarbon containing formation comprising:    (1) heating a portion of the formation to increase permeability and form a uniform permeability within the portion;    (2) allowing the portion to cool; and    (3) storing carbon dioxide within the portion; and    (9) method for in situ production of energy from a hydrocarbon containing formation.    (10) method for producing ammonia using a carbon containing formation.    DESCRIPTION OF DRAWING(S) - The figure depicts a diagram of using pyrolysis water to generate synthesis gas in a formation.    Heat source (801)    Electric heater (803)    Synthesis gas (823)    Production well (825)