NOVELTY - In situ treatment of hydrocarbon containing formation comprises transferring heat from heat source(s) (801) to a selected section of the formation. The heat is controlled from the heat sources such that an average temperature within a majority of the selected section of the formation is less than 375degreesC. A mixture is produced from the formation.    USE - The method is used for the in situ treatment of hydrocarbons containing formation, for the production of hydrocarbons, and hydrogen.    ADVANTAGE - The method yields relatively high quality hydrocarbon products.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method of installing a heater well into a hydrocarbon containing formation comprising:    (1) forming a bore in the ground using a steerable motor and an accelerometer; and    (2) providing a heating mechanism within the bore such that the heating mechanism can transfer heat to a portion of the formation;    (2) 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;    (3) an in situ method for heating a hydrocarbon containing formation comprising:    (1) 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;    (2) providing the oxidizing fluid to a reaction zone in the formation;    (3) allowing the oxidizing fluid to react with the portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone; and    (4) transferring the generated heat by conduction from the reaction zone to a pyrolysis zone in the formation;    (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 certain temperature to allow synthesis gas generation;    (2) providing a synthesis gas generating fluid (821) to the section to generate synthesis gas; and    (3) removing synthesis gas from the formation;    (7) a method for in situ production of energy from a hydrocarbon containing formation comprising:    (1) providing heat from heat sources to a portion of the formation;    (2) allowing the heat to transfer from the heat sources to a selected section of the formation;    (3) producing pyrolysis products from the formation;    (4) providing a portion of the pyrolysis products to a reformer to generate synthesis gas;    (5) producing the synthesis gas from the reformer;    (6) providing a portion of the produced synthesis gas to a fuel cell to produce electricity; and    (7) storing a portion of the carbon dioxide in the carbon dioxide containing exit stream in a subsurface formation; and    (8) 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.    (9) a method of sequestering carbon dioxide within a hydrocarbon containing formation comprising heating a portion of the formation to increase permeability and form a uniform permeability within the portion, cooling the portion, and storing carbon dioxide within the portion.    (10) a method for producing ammonia using a carbon containing formation comprising:    (1) separating air to produce an oxygen-rich stream and a nitrogen-rich stream;    (2) heating a selected section of the formation to a predetermined temperature to support reaction of carbon-containing material in the formation to form synthesis gas;    (3) providing synthesis gas generating fluid and a portion of the oxygen rich stream to the selected section;    (4) allowing the synthesis gas generating fluid and oxygen in the oxygen-rich stream to react with a portion of the carbon-containing material in the formation to generate synthesis gas;    (5) producing synthesis gas from the formation, in which the synthesis gas comprises hydrogen and carbon monoxide;    (6) providing a portion of the hydrogen in the synthesis gas to an ammonia synthesis process;    (7) providing nitrogen to the ammonia synthesis process; and    (8) using the ammonia synthesis process to generate ammonia.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the use of water recovered from pyrolysis fluid production used to generate synthesis gas.    Heat source (801)    Electrical heaters (803)    First portion (805)    Gas and liquid streams (811)    Synthesis gas generating fluid (818)    Synthesis gas (823)    Production well (825)