Organic geochemistry of potential source rocks of the Vendian Khatyspyt formation, Olenek uplift

The problem of identifying and studying potential source rocks in the Vendian deposits on the Siberian platform remains relevant. In this article, archival and new data on geochemistry of rocks and organic matter (OM) from the Khatyspyt formation of the Vendian were generalised. The distribution of OM was analysed in unified, entire section of the formation along Khorbusuonka river (tributary of the Olenek river). The levels of rocks anomalously enriched and depleted with OM were established and the conditions of their formation during sedimentogenesis were diagnosed. It is assumed, that the black shales extend to the north-west from the Olenek uplift. The study of the composition and distribution of hydrocarbon-biomarkers showed that oxidation-reduction conditions in the marine basin were changing during sedimentogenesis. The formation of black shales was under weakly reducing conditions without hydrogen sulfide contamination of waters. Carbonate sediments, depleted and weakly enriched with OM accumulated, as a rule, during stratification of the water column and under hydrogen sulfide contamination of waters. The OM catagenesis corresponds to early oil window, OM of the Khatyspyt formation was generating naphtides. The generalisation of information about structure of the sedimentary cover of the northeast of the Siberia shows that commercially productive oil and gas accumulations associated with realisation of the Khatyspyt source rock generative potential can be found in the Neoproterozoic and Palaeozoic deposits of the Sukhana depression and Lena-Anabar trough.

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