Forecast of elements of petroleum systems in the joint zone of the Siberian platform and adjacent structures in the southwestern part of the Laptev sea

Background. Signs of oil and gas potential have been identified in the sedimentary cover of the northern rim of the Siberian Platform and the adjacent water area of the Laptev Sea. These signs indicate the presence of active generation and accumulation of petroleum systems. In addition to the established industrial oil and gas potential in the Permian section interval, the north of the Siberian platform is also associated with Riphean, Vendian, and Devonian deposits; however, drilling has not confirmed the productivity of these section intervals. The present study is aimed at assessing the oil and gas potential of the Khatanga-Lena region of the Siberian sector of the Russian Arctic and the southwestern part of the Laptev Sea. Their study within the framework of a single model can extend the understanding of the development of sedimentary basins and the petroleum systems included in their composition.

Aim. Identification of effective petroleum systems in the joint zone of the Siberian Platform and adjacent structures in the southwestern part of the Laptev Sea.

Materials and methods. Analysis of available published and stock information with the purpose of identifying elements of the assumed petroleum systems. Mapping of geochemical characteristics of potential oil and gas source rocks. Numerical simulation of petroleum systems and identification of effective zones of oil and gas generation. Quantitative assessment of the hydrocarbon potential of source rocks.

Results. Two effective petroleum systems have been identified in the joint zone of the Siberian Platform and adjacent structures of the southwestern part of the Laptev Sea. These include Lower Kozhevnik-Upper Kozhevnik and Upper Jurassic-Cretaceous systems.

Conclusion. The contribution of the Lower Kozhevnik-Upper Kozhevnik petroleum system to the oil and gas potential of the Anabaro-Khatanga region and the coastal part of the Laptev Sea is estimated at about five billion tons of hydrocarbons. The Upper Jurassic-Cretaceous system can provide up to 1.4 billion tons of hydrocarbons in the southwestern part of the Laptev Sea shelf, which makes it possible to associate high oil and gas potential with the water area.

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