Study of organic matter thermal decomposition kinetics using pyro-GC method

The authors present the developed new original technique for hydrocarbon composition determination of kerogen pyrolysis products aimed at studying the kinetics of rock Organic Matter transformation and creating four-component kinetic spectra based on the results obtained by Rock-Eval and pyrolysis-gas chromatography methods. The example of different-age source rocks of the West Siberian basin is discussed. The Rock-Eval method allows obtaining information on the total amount of hydrocarbons formed from Organic Matter (kerogen), while pyrolytic chromatography makes it possible to quantitative relationship of different HC groups at each heating step. Pyrolysis of Organic Matter with subsequent analysis of hydrocarbon composition of the formed products allows obtaining multicomponent (gas, liquid hydrocarbons) spectra of generation potential distribution according to activation energy of reactions of kerogen conversion into hydrocarbons. Configuration of the spectra depends on kerogen structure; it is individual for each type of Organic Matter