Crystalline Basement as a Possible Source of Hydrocarbons in the Republic of Tatarstan

Author details
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation
  • PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation
  • TatNIPIneft R&D Institute of the PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Russian Federation

Abstract

As is well known, the crystalline basement is the lower level (of both ancient and young platforms), composed of dislocated sedimentary, volcanic, metamorphic, and intrusive rocks. In this study, the basement and its weathering crust are examined from the perspective of natural reservoirs capable of accumulating and retaining hydrocarbons. It is noted that subduction-obduction and rifting geodynamic regimes provide the best geological conditions for the formation of zones of decompressed fractured rocks (granites, granite gneisses, schists, phyllites, etc.) and oil and gas accumulations. Based on data published in the scientific literature (both foreign and domestic) on the petroleum potential of crystalline basement rocks in foreign countries, the total oil and gas reserves contained in basement rocks and their weathering crust at developed international fields were calculated. A conceptual framework for the formation of hydrocarbon deposits in basement rocks was developed, with the aim of predicting promising zones within crystalline basement rocks in the Republic of Tatarstan. It was found that, in terms of the geological and tectonic structure of the basement, the Archean-Lower Proterozoic basement of the Northern Structural-Tectonic Zone of the Pripyat Trough and the northern edge of the Dnieper-Donets Aulagen can serve as an analogue for the republic's territory. Oil, gas, and condensate deposits have been identified within these territories. Based on the analyzed material on the study of crystalline basement rocks, promising directions for searching for possible hydrocarbon accumulations both in the basement body itself and in its weathering crust, as well as possible migration routes for hydrocarbons within the territory of the Republic of Tatarstan, have been identified.

Keywords

crystalline basementprotrusiongeodynamic regimemigrationfielddepositreservoirhydrocarbonsoil and gas potentialRepublic of Tatarstanforeign experiencegranitesdecompression zonetectonic faultfracturing

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Article information

Published
21 November 2025
Issue date
21 November 2025
Issue
Vol. 25, No. 4 (2025)
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