NOVELTY - Treating an oil shale formation comprises transferring heat from heat source(s) (8692) to a selected section of the formation and controlling the heat so that average temperature within the selected section is less than 375 degrees C, to produce a mixture from the formation.    USE - For production of hydrocarbons, hydrogen and other organic and/or inorganic compounds such as pyridines, pyrroles, thiophenes, naphthalene, anthracenes and ammonia; for production of synthesis gas for generating methane, methanol, gasoline, ammonia and middle distillates, for generation of electricity, and for energy generation unit such as molten carbonate fuel cell, solid oxide or other types of fuel cells; and for conversion of synthesis gas to paraffins used in diesel, jet fuel and naphtha products.    ADVANTAGE - The method enables effective conversion of oil shale formation into mixture of relatively high quality hydrocarbon products, hydrogen and other organic and/or inorganic compounds. The temperature and pressure in the formation are controlled during pyrolysis to yield improved products from the formation. The spacing between heat sources may be selected to optimize heating of the section selected for treatment. Therefore, hydrocarbons may be pyrolyzed within larger area of the portion. Spacing between the heat sources is selected to increase the effectiveness of the heat sources, thus increasing economic viability of a selected in situ conversion process for hydrocarbons. Superposition of heat tends to increase the uniformity of heat distribution in the section of the formation selected for treatment.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) an in situ method for producing hydrogen from oil shale formation;    (2) formation of heater wells in an oil shale formation;    (3) in situ method for heating oil shale formation;    (4) a mixture produced from portion of oil shale formation;    (5) condensable hydrocarbons produced from portion of oil shale formation;    (6) in situ production of synthesis gas from oil shale formation;    (7) production of the spent portion of formation within oil shale formation;    (8) sequestering carbon dioxide within an oil shale formation;    (9) in situ production of energy from an oil shale formation;    (10) production of ammonia using an oil shale formation;    (11) treatment of hydrocarbons in at least a portion of the oil shale formation;    (12) a system configurable to heat an oil shale formation;    (13) production of a conductor-in-conduit heat source for oil shale formation;    (14) formation of an opening in an oil shale formation;    (15) a system for drilling openings in an oil shale formation;    (16) an installation of conductor-in-conduit heat source of desired length in oil shale formation;    (17) a heat source for heating oil shale formation;    (18) a method of using a computer system for modeling/operating in situ process for treating oil shale formation;    (19) a carrier medium comprising program instructions;    (20) a method of modeling one or more stages of process for treating oil shale formation;    (21) in situ method of measuring accessing temperature within a wellbore in oil shale formation;    (22) a method for controlling in situ system of treating oil shale formation;    (23) a method of predicting characteristics of formation fluid produced from in situ process;    (24) method of converting formation fluids into olefins;    (25) method of separating olefins from fluids produced from oil shale formation;    (26) method of enhancing phenol production from in situ oil shale formation;    (27) method of controlling phenol production from oil shale formation;    (28) method of separating phenols from oil shale formation;    (29) method of enhancing BTEX (benzene, toluene, ethyl benzene and xylene) compounds production from oil shale formation;    (30) method of separating BTEX compounds from formation fluid from oil shale formation;    (31) in situ conversion of at least a portion of formation fluid into BTEX compounds;    (32) method of enhancing naphthalene production from oil shale formation;    (33) method of separating naphthalene from fluids produced from oil shale formation;    (34) method of enhancing anthracene production from oil shale formation;    (35) method of separating anthracene from fluids produced from oil shale formation;    (36) method of separating ammonia from fluids produced from oil shale formation;    (37) method of enhancing pyridines production from oil shale formation;    (38) method of separating pyridine from fluids produced from oil shale formation;    (39) method of enhancing pyrroles production from oil shale formation;    (40) method of separating pyrroles from fluids produced from oil shale formation;    (41) method of enhancing thiophenes production from oil shale formation;    (42) method of separating thiophenes from fluids produced from oil shale formation;    (43) method of recovering thermal energy from heated oil shale formation;    (44) production of molecular hydrogen from oil shale formation;    (45) production of methane from oil shale formation;    (46) method for upgrading hydrocarbons in oil shale formation;    (47) method for hydro-treating fluid in heated formation;    (48) production of hydrocarbons from heated formation;    (49) method of utilizing heat of heated formation;    (50) method of storing fluids within oil shale formation;    (51) method of filtering water within oil shale formation;    (52) method of recovering methane from oil shale formation;    (53) method of shutting-in an in situ treatment process in oil shale formation;    (54) production of soluble compound from soluble compound containing oil shale formation; and    (55) method of solution mining alumina from an in situ oil shale formation.