THE ROLE OF TECTONIC FACTOR IN THE FORMATION OF HYDROCARBON ACCUMULATIONS IN THE NEOCOMIAN CLINOFORMS OF WESTERN SIBERIA

V. S. Staroseltsev

Siberian Research Insti tute of Geology, Geophysics, and Mineral Resources, Novosibirsk, Russia

The paper considers major geological and geophysical arguments that prove the considerable influence of faulting on the formation of the Neocomian clinoform accumulations in the West Siberian sedimentary basin and their petroleum content. In the study, the author considered thrusty slipping planes found in the core obtained from the clinoforms, the regularities in clinoforms distribution relative to the boundaries of their sedimentary basins in seismic sections and their position relative to the ancient Siberian Platform and its Taymyr folded margin. The clinoforms change their inclination to opposite above horsts tapering upwards and complicating the basement of the West Siberian geosyneclise. In the structure of specific fields the role of syndepositional and mainly diagonal faults in the Upper Jurassic – Neocomian deposits is significant.

Key words: Neocomian clinoforms, bituminous deposits of the Bazhenovskaya Formation, postsedimentary thrust faults and syndepositional subvertical faults.

DOI 10.20403/2078-0575-2017-1-54-57

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