Reconstruction of Paleogeochemical Data from the Riphean-Vendian Sediments of the Vychegda Depression of the Volga-Ural Oil and Gas Province

Author details
  • PermNIPIneft branch of LUKOIL-Engineering LLC, Perm, Russian Federation; Perm National Research Polytechnic University, Perm, Russian Federation
  • Perm National Research Polytechnic University, Perm, Russian Federation

Abstract

Reconstruction of paleogeochemical data is one of the important stages in the projection of oil and gas content and modeling of sedimentary basins. The present research is devoted to reconstruction of paleogeochemical data of the Riphean-Vendian source rocks of the Vychegda Depression, which occupies the territory of the northern Volga-Ural oil-and-gas province. Five oil-producing formations are traced in the studied area: Pez Formation RF2pz, composed of argillites, siltstones and sandstones, Omen RF3om and Nyafta RF3nf Formations, of predominantly carbonate composition with interlayers of terrigenous sediments (argillites, sandstones, and siltstones), as well as the Ust-Pinega Formation V2up and rocks of the Kudymkar Series V2kd consisting of interbedded argillites, siltstones, and sandstones. Based on the analysis of the results of pyrolytic studies, it was established that the organic matter of the source rocks at the present stage is characterized by predominantly low values of the main geochemical parameters and high catagenetic transformation. Reconstruction of the paleogeochemical data included determination of the degree of realization of the initial generative potential by the source rocks, reconstruction of the paleo values of the hydrogen index, total organic carbon and generative potential. According to the results obtained, the Riphean-Vendian source rocks of the Vychegda Depression are enriched in the sapropelic (I/II) type of organic matter. The Pez, Omen and Nyafta formations of the Riphean have predominantly good and very good initial generative potential, while the initial potential of the Vendian sediments: Ust-Pinega Formation and Kudymkar Series is estimated as fair to very good. Initial generative potential of Riphean rocks is realized by 50-100 %, and Vendian – up to 60 %. The greatest perspectives of oil-and-gas content are connected with Vendian sediments. Riphean source rocks also have the ability to generate hydrocarbons, but in small volumes.

Keywords

Vychegda DepressionRiphean and Vendian sedimentspyrolytic datapaleogeochemical datareconstructionsource rocksgeneration potentialorganic matter

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Article information

Published
25 March 2024
Issue date
25 March 2024
Issue
Vol. 23, No. 3 (2023)
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