CAMBRIAN SECTION IN THE EAST OF THE WEST SIBERIAN GEOSYNECLISE ( based on data from Vostok 4 well )
A.E. Kontorovicha, V.A. Kontorovicha, I.V. Korovnikova, S.V. Saraeva, N.V. Sennikova, Yu.F. Filippova, A.I. Varlamovb, A.S. Efimovc, Yu.A. Filiptsovd, A.A. Postnikova, A.A. Terleeva, G.A. Karlovaa, K.E. Nagovitsina, D.A. Tokareva, T.P. Baturinaa, I.A. Gubina, B.B. Kochneva, N.V. Novozhilovaa, and V.A. Luchininaa
aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
bAll-Russia Research Geological Oil Prospecting Institute, sh. Entuziastov 36, Moscow, 105118, Russia
cSiberian Research Institute of Geology, Geophysics and Mineral Resources, Krasnyi pr. 67, Novosibirsk, 630091, Russia
dSubsurface Management Department in Krasnoyarsk Territory, ul. Karla Marksa 62, Krasnoyarsk, 660049, Russia
Keywords: Stratigraphic test well, Cambrian, West Siberian geosyneclise, Yenisei sedimentary basin
Pages: 972-981
Abstract
The study presents a description of a new type of Cambrian section penetrated in Vostok 4 well in the southeastern part of the West Siberian geosyneclise (Krasnoyarsk Territory). The drilled succession is well characterized by the fossil evidence and can be considered a key section for the east of the WSG. The section comprises all three divisions of the Cambrian and is subdivided into the Oksym, Tyya, Averin, Kolchum, and Evenki Formations, based on the composite log data for an interval of 2262-5105 m. The Oksym Formation (the age equivalent of the Usol'e Formation) and Kolchum Formation are first identified and described in this study. The section is mostly carbonate, argillaceous-carbonate, sulfate-carbonate, and terrigenous sediments deposited in a back-reef setting of the Yenisei salt-bearing basin.
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