Home – Home – Jornals – Fundamental and applied issues of mining 2020 number 2

For the purpose of comparative study of oil source properties of the 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 the set of bituminological parameters, the studied naphthide occurrences 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 a wide range of bituminous varieties as traces of generation, migration and accumulation of hydrocarbons. According to the composition and distribution features of relict hydrocarbons, the naphthide occurrences 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 the Devonian deposits, which entered the zone of the main phase of oil formation and could generate liquid hydrocarbons, and in zones of deeper immersion they reached the main phase of gas formation. The obtained results on the geochemistry of organic matter confirm the existing point of view on the general history of geological development and the similarity of the formation conditions of oil and gas potential in offshore territories of the Laptev and East Siberian seas and the continental part of the East Siberian platform. This allows approaching the assessment of the oil generation potential of organic matter in rocks and the oil and gas content of Devonian deposits on the offshore based on the results of a more studied continental part of the territory in question.