NOVELTY - Treating a hydrocarbon containing formation in situ comprises transferring heat from at least one heat source to a portion of a selected section of the formation. The heat is controllably transferred so that, an average temperature within a majority of the selected section is less that 375degreesC. A mixture is then produced from the formation.    USE - Used for in situ treating hydrocarbon containing formations e.g. a formation containing coal, including lignite or sapropelic coal; oil shale, carbonaceous shale; shungites, kerogen, oil, kerogen and oil in a low permeability matrix, heavy hydrocarbons, asphaltites, natural mineral waxes, and formations in which kerogen is blocking production of other hydrocarbons.    ADVANTAGE - By heating the portion of the hydrocarbon containing formation by oxidation in combination with heating the portion of the formation by an electric heater, an energy input cost can be reduced. The electric heater can be turned down and/or off when the oxidation reaction begins to provide sufficient heat to the formation. In this manner, electrical energy costs associated with heating the portion of the formation with the electric heater can be reduced. A more economical process can be provided for heating a hydrocarbon containing formation in comparison to heating by a conventional method. The oxidation reaction can be propagated slowly through a greater portion of the formation so that fewer heat sources may be required to heat such a greater portion in comparison to heating by a conventional method. The treated product is of high quality.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (A) an in situ method for producing H2 from a hydrocarbon containing formation;    (B) production of heater wells in a hydrocarbon containing formation, which comprises:    (i) forming a first wellbore in the formation;    (ii) forming a second wellbore in the formation using magnetic tracking so that the second wellbore is arranged parallel to the first wellbore, and    (iii) providing a heating mechanism within the first wellbore and a heating mechanism within the second wellbore so that the heating mechanisms can provide heat to the portion of the formation;    (C) installing a heater well into a hydrocarbon containing formation which comprises:    (i) forming a bore in the ground using a steerable motor and an accelerometer; and    (ii) providing a heating mechanism within the bore so that the heating mechanism can transfer heat to a portion of the formation;    (D) a system for heating a hydrocarbon containing formation which comprises:    (i) a heater in an opening in the formation;    (ii) an oxidizing fluid source, and    (iii) a conduit in the opening for providing an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use; and    (E) an in situ method for heating a hydrocarbon containing formation which comprises:    (i) heating a portion of the formation to a predetermined temperature to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid;    (ii) providing the oxidizing fluid to a reaction zone in the formation, allowing the oxidizing fluid to react with the portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone, and    (iii) transferring the generated heat by conduction from the reaction zone to a pyrolysis zone in the formation;    (F) a mixture produced from a portion of a hydrocarbon containing formation which comprises less than 10 wt.% olefin, and less than 35 average carbon number;    (G) in situ production of synthesis gas (823) from a hydrocarbon containing formation which comprises:    (i) heating a section of the formation to a certain temperature to allow synthesis gas generation;    (ii) providing a synthesis gas generating fluid (821) to the section to generate synthesis gas, and    (iii) removing synthesis gas from the formation;    (H) forming a spent portion of formation within a hydrocarbon containing formation which comprises heating a first portion of the formation to pyrolyze hydrocarbons within the first portion and to establish a uniform permeability within the first portion and cooling the first portion;    (I) sequestering carbon dioxide within a hydrocarbon containing formation which comprises a heating a portion of the formation to increase permeability and form a uniform permeability within the portion, allowing the portion to cool and storing carbon dioxide within the portion;    (J) in situ production of energy from a hydrocarbon containing formation which comprises providing heat from heat sources to a portion of the formation, allowing the heat to transfer from the heat sources to a selected section of the formation,producing pyrolysis products from the formation, providing a portion of the pyrolysis products to a reformer to generate synthesis gas, producing the synthesis gas from the reformer and providing a portion of the produced synthesis gas to a fuel cell to produce electricity.    DESCRIPTION OF DRAWING(S) - The figure shows a treatment diagram of using pyrolysis water to generate synthesis gas in a formation.    Heat source (801)    Electrical heater (803)    Aqueous stream (811)    Gas generating fluid (821)    Synthesis gas (823)    Production well (825)