K.O. Sobornov
Geodynamics of the north of the West Siberian Basin in the Phanerozoic: a new interpretation and oil and gas potential
DOI 10.47148/0016-7894-2025-5-17-35
Key words: West Siberian basin; Paleozoic deposits; oil migration; salt diapirism; rifting.
For citation: Sobornov K.O. Geodynamics of the north of the West Siberian Basin in the Phanerozoic: a new interpretation and oil and gas potential. Geologiya nefti i gaza. 2025;(5):17–35. DOI: 10.47148/0016-7894-2025-5-17-35. In Russ.
Acknowledgments: The author is deeply indebted to G.A. Belenitskaya, V. Igoshkin, D.G. Kushnir, B. Lopez-Mir, A.A. Nezhdanov, A.N. Obukhov, V.A. Skorobogatov, O.A. Smirnov, Yu.V. Phillipovich for fruitful discussions concerning various aspects of seismic interpretation and geology of Western
Siberia..
The study of geological and geophysical data characterizing the deep structure of the northern part of the West Siberian basin enables the identification of new elements of its geodynamic development, including the following: (1) the beginning of the sedimentary cover formation occurred as a result of the Ural rifting in the Early Paleozoic, which later passed into the post-rift stage of the formation of deposits of the continental margin, which was followed by a continental collision at the end of the Paleozoic; (2) at the end of the rift stage, evaporite deposits accumulated in large troughs, which led to the development of salt diapirs; (3) deformations in the Jurassic-Cretaceous sediments are largely due to a series of far-field intraplate episodes of basin contraction, which caused inversion and strike-slip displacements on the pre-existing Paleozoic faults. The thickness of the Paleozoic strata in the troughs reaches 10-15 km. They contain prolific oil and gas source rocks. The Paleozoic section most likely contributed greatly to the formation of huge gas accumulations in the Jurassic-Cretaceous sediments. Diapirism was one of the main drivers in the structural development of the region, and salt structures determined the directions of hydrocarbon migration. Episodes of structural inversion of Paleozoic faults influenced the facies zonation and the growth of anticlinal traps in the Jurassic-Cretaceous deposits.
Konstantin O. Sobornov ORCiD
Doctor of Geological and Mineralogical Sciences,
Chief researcher
All-Russian Research
Geological Oil institute,
36, sh. Entuziastov, Moscow, 105118, Russia
e-mail: sobornov@vnigni.ru
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