Kinetics of formation of individual C1-C5 hydrocarbons during stepwise dry pyrolysis of kerogen from Domanik shale after hydrothermal treatment

The article presents the results of determining the kinetic characteristics of the formation of individual hydrocarbon gases at different stages of artificially increased thermal maturity of the Domanik shale from an Chut River outcrop (Ukhta District). Based on the data of stepwise pyrolysis of residual kerogen isolated from the shale after hydrothermal treatment, the distributions of the formation potential of individual hydrocarbons of the composition C1-C5 by the activation energy scale (kinetic spectra) were determined. The kinetic spectra of n butane and n pentane do not change with increasing temperature of the hydrothermal experiment and increasing maturity of the organic matter. The maximum of the potential distribution on the activation energy scale of methane and ethane shifts to the region of higher values with increasing thermal maturity. The results can be used to clarify the conditions for the implementation of the gas formation potential in the domanik deposits of the Timan-Pechora basin.