Geochemistry of organic matter of Devonian deposits in Kotelny island (New Siberian Islands) and Selennyakhsky uplift (Omulevsky terrain)

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Authors: Zueva, IN, Chalaya, ON, Safronov, AF, Glyaznetsova, YuS, Lifshits, SKh
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2022
• Subjects: New Siberian Islands; Kotelny Island; laptev
• Online Access: http://dx.doi.org/10.1088/1755-1315/991/1/012006; https://iopscience.iop.org/article/10.1088/1755-1315/991/1/012006; https://iopscience.iop.org/article/10.1088/1755-1315/991/1/012006/pdf

Abstract For the purpose of comparative study of oil source properties of Devonian deposits in the central part of Kotelny island (New Siberian Islands) and Selennyakhsky uplift (Omulevsky terrain), geochemical studies of the composition, chemical structure of chloroform-extracted bitumens of organic matter and relict hydrocarbons were conducted. In terms of bituminological parameters, naphthide manifestations are characterized by large variations in the content of organic matter, the yield of chloroform-extracted bitumens, group composition and chemical structure of chloroform-extracted bitumens, which indicates the presence of bituminous varieties as traces of generation, migration and accumulation of hydrocarbons. According to the composition and distribution features of relict hydrocarbons, naphthide manifestations in the central part of Kotelny island and Selennyakhsky uplift show great similarity, which is proved by their common type of aquagenic initial organic matter, its high degree of maturity and a sufficiently high generation potential of Devonian deposits, which entered main oil formation stage and could generate liquid hydrocarbons, and in deeper subsidence zones they reached main gas formation stage. The obtained results on the geochemistry of organic matter confirm the existing viewpoint on general history of geological development and similarity of the formation conditions for oil and gas potential in offshore territories of the Laptev and East Siberian seas as well as in continental part of the East Siberian platform. This allows estimating oil generation potential of organic matter in rocks and oil-and-gas content in offshore Devonian deposits based on the results of a better known continental part of the territory.