Organic matter geochemistry of the domanik section along the Pymvashor river, Chernyshev swell (Timan-Pechora basin)

The hydrocarbon composition of organic matter from outcrops of Domanik Formation along the Pymvashor river at the Chernyshev swell was studied. The biomarkers distribution in the samples was variable. It depended on the lithological composition of the rocks and depositional environment of organic matter. The extracted bitumens from calciferous argillite had differences in the distribution of n -alkanes (maximum at n -С13 - n -С18), higher Pr/Ph ratio and higher content of hopanes. Organic matter maturity was defined based on sterane and homohopane biomarkers indicators and aromatic maturity parameters. All maturity indicators suggest that the organic matter of Domanik Formation was in the peak stage of oil generation (Ro ~ 0.6-0.75 %). This level of maturity is also confirmed by conodont Color Alteration Index (CAI) values in the range of 2.5-3. Based on the differences in the biomarkers distribution of the organic matter Domanik Formation, the oils generated by it would have different hydrocarbon features.