Biostratigraphy and lithofacies of the Middle-Upper Devonian in the Ayazovo oil field (North-Eastern of Bashkiria)
https://doi.org/10.24930/1681-9004-2023-23-1-68-91
Abstract
Research subject. Oil-bearing deposits of the Middle-Upper Devonian in the Ayazovo oil field located in the north-east of Bashkiria.
Materials and methods. A detailed description and subdivision of the section were carried out based on the borehole cores of the Rustamovskaya area using biostratigraphic and lithofacial analysis, micropalaeontology of spores and conodonts.
Results. The sediments of the Pashian, Timan, Sargaevo, Domanic and Mendym horizons are identified, their lithofacial features are described, and sedimentation conditions are determined.
Conclusions. The studied succession of the Devonian sediments demonstrates cyclical changes in terrigenous and carbonate shelf sedimentation environments caused by eustatic sea level change and complicated by the tectonic events associated with the formation of uplifts and troughs of the Kama-Kinel system at the end of the Frasnian.
Keywords
Volga-Ural oil-bearing province,
Devonian,
Domanic horizon,
conodonts,
plant spores,
lithofacial analysis,
oil-bearing rocks,
transgression,
regression
Supporting agencies: The studies were carried out within the state assignments no. FMRS-2022-0010 and FMRS-2022-0015 (IG UFIC RAS). The authors are grateful to the Ingeoholding Oil Company for the core material provided. We also thank the reviewers for valuable comments and recommendations.
About the Authors
E. N. Gorozhanina
Institute of Geology – Subdivision of the Ufa Federal Research Centre RAS
Russian Federation
Russian Federation
16/2 K. Marx st., ufa 450007
V. N. Pazukhin
Institute of Geology – Subdivision of the Ufa Federal Research Centre RAS
Russian Federation
Russian Federation
16/2 K. Marx st., ufa 450007
V. M. Gorozhanin
Institute of Geology – Subdivision of the Ufa Federal Research Centre RAS
Russian Federation
Russian Federation
16/2 K. Marx st., ufa 450007
Z. A. Voykina
Institute of Geology – Subdivision of the Ufa Federal Research Centre RAS
Russian Federation
Russian Federation
16/2 K. Marx st., ufa 450007
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Review
For citations:
Gorozhanina E.N., Pazukhin V.N., Gorozhanin V.M., Voykina Z.A. Biostratigraphy and lithofacies of the Middle-Upper Devonian in the Ayazovo oil field (North-Eastern of Bashkiria). LITHOSPHERE (Russia). 2023;23(1):68-91. (In Russ.) https://doi.org/10.24930/1681-9004-2023-23-1-68-91
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