A kerogen samples set from organic carbon rich rocks of the Middle Frasnian Early Famennian age (Domanikites) of the Timan-Pechora basin, was characterized by the Rock-Eval pyrolysis data, solid-state 13C NMR spectroscopy and Fourier transform IR spectroscopy. Additionally, the spectral characteristics of kerogen isolated from rocks artificially maturated in an autoclave in the presence of water were investigated. In general, the direction of transformation of the kerogen structure with a natural or artificial maturation coincides. For kerogen, subjected to artificial maturation, is characterized by an increase in the concentration of terminal methyl groups in relation to the methylene units. Artificial maturation of kerogen leads to a more rapid rearrangement of aromatic clusters with the accumulation of bridgehead and protonated carbon as compared with natural maturation.
Results of 13c nmr and ftir spectroscopy of kerogen of the upper devonian domanik of the Timan-Pechorian basin
