TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The injected fluid comprises organic trace elements which are derived from extracts of cell culture, such as cells of bacteria or yeast such as baker's yeast, preferably extracted by hydroalcoholic extraction. The indigenous microorganisms comprise at least bacteria, archaea, preferably active group of syntrophic bacteria and methanogenic archaea. The stimulated indigenous archaea is Crenarchaeota family.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: In the nutrient composition partly forming the fluids, (a) sodium chloride concentration is 0-35 g/l, preferably 1 g/l; (b) the concentration of nitrite (sodium nitrite) is 2-10 mM, preferably 5 mM; (c) sulfite concentration (sodium sulfite) is 2-10 mM, preferably 5 mM; (d) concentration of molybdate (sodium molybdate) is 2-10 mM, preferably 3 mM; (e) concentration of ferric oxide (Fe2O3) is 2-10 mM, preferably 5 mM; (f) concentration of potassium chloride is 10-9 and 10 g/l, preferably 0.335 g/l; (g) concentration of magnesium chloride is 10-9 and 35 g/l, preferably 3.45 g/l; (h) concentration of manganese chloride is 10-9 and 35 g/l, preferably 4 g/l; (i) concentration of ammonium chloride is 10-9 and 15 g/l, preferably 0.25 g/l; (j) concentration of calcium chloride is 10-9 and 35 g/l, preferably 0.14 g/l; (k) concentration of potassium phosphate is 10-9 and 12 g/l, preferably 0.14 g/l; (l) concentration of iron chloride is 10-9 and 5 g/l, preferably 2 mg/l; (m) concentration of sodium acetate is 10-9 and 150 g/l, preferably 1 g/l; (n) concentration of yeast extract is 10-9 and 5 g/l, preferably 2 g/l; (o) trypticase concentration is 10-9 and 50 g/l, preferably 2 g/l; (p) concentration of sodium bicarbonate is 10-9 and 50 g/l, preferably 5 g/l; (q) concentration of cobalt chloride is 10-9 and 5 g/l, preferably 1 mg/l; (r) concentration of nickel chloride is 10-9 and 5 g/l, preferably 1 mg/l; (s) concentration of zinc chloride is 10-9 and 5 g/l, preferably 1 mg/l; (t) concentration of copper(II) chloride is 10-9 to 5 g/l, preferably 0.1 mg/l; (u)concentration of sodium vanadate is 10-9 to 5 g/l, preferably 0.1 mg/l; (v) concentration of aluminum potassium (AlK(OH)2) is 10-9 and 5 g/l, preferably 0.1 mg/l; (w) concentration of boric acid (H3BO3) is 10-9 and 5 g/l, preferably 0.1 mg/l; (x) concentration of lithium chloride (LiCl) is 10-9 and 5 g/l, preferably 0.01 mg/l; (y) concentration of biotin is 10-9 and 5 g/l, preference of 0.02 mg/l; (aa) folic acid concentration is 10-9 and 5 g/l, preferably 0.02 mg/l; (bb) concentration of pyridoxine or pyridoxine hydrochloride is 10-9 to 5 g/l, preferably 0.1 mg/l; (cc) concentration of thiamine or thiamine-hydrochloride is 10-9 to 5 g/l, preferably 0.05 mg/l; (dd) riboflavin concentration is 10-9 and 5 g/l, preferably 0.05 mg/l; (ee) nicotinic acid concentration is 10-9 and 5 g/l, preferably 0.05 mg/l; (ff) pantothenate concentration of calcium is 10-9 and 5 g/l, preferably 0.05 mg/l; (gg) vitamin B12 concentration is 10-9 and 5 g/l, preferably 0.001 mg/l; (hh) concentration of p-aminobenzoic acid is 10-9 and 5 g/l, preferably 0.05 mg/l; (ii) concentration of thioctic acid is 10-9 and 5 g/l, preferably 0.05 mg/l; (jj) ascorbic acid concentration is 10-9 and 5 g/l, preferably 0.05 mg/l; (kk) optional concentration of cysteine-hydrochloride is 10-9 and 50 g/l, preferably 0.5 g/l; and (ll) concentration of sodium sulfide is 10-9 and 50 g/l, preferably 0.5 g/l.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The process comprises: (1) injecting fluids, preferably under pressure, in one or more layers rich in natural kerogens through which these fluids percolate; (2) metabolic forcing of indigenous microorganisms by fluids for increasing the degradation of kerogens and producing methane in the kerogens; (3) pumping fluids that percolated through the kerogens and containing the produced methane; (4) collecting methane, preferably gradually from its production; (5) compressing the collected methane; and (6) storing and/or distributing collected and compressed methane. The process comprises a preliminary step (PI) for forcing in the subsoil for injecting fluids in one or layers rich in natural kerogens, preferably kerogens having ratio H:C of greater than or equal to 1. The process comprises preliminary phase of exploring and prospecting, preferably by core sampling, for selecting one or more layers of high potential gas fitter, preferably rich in kerogens, in a given geological site. The preliminary phase comprises: qualitative and/or quantitative identification of indigenous microorganisms, contained in the kerogens of the core sampling by methods of molecular biology, such as polymerase chain reaction (PCR), cloning and sequencing, and if methanogenic microorganisms are identified in these kerogens, monitoring of methane production by these indigenous microorganisms previously identified in the kerogen for core sampling, the monitoring comprises: measuring of methane production in target kerogens for core sampling after injection of fluids comprising water, nutrients, at least one adjuvant and optionally carbon dioxide and/or hydrogen, the composition of the fluids; comparing the concentration of methane with control samples; and quantifying the in situ production of methane for studied geological layers.