The first section of vendian deposits in the basement complex of the West Siberian petroleum megabasin (resulting from the drilling of the Vostok-3 parametric borehole in the Eastern Tomsk region)

• Published in: Doklady earth sciences 2009-03, Vol.425 (1), p.219-222
• Main Authors: Kontorovich, A. E., Sokolov, B. S., Kontorovich, V. A., Varlamov, A. I., Grazhdankin, D. V., Efimov, A. S., Klets, A. G., Saraev, S. V., Terleev, A. A., Belyaev, S. Yu, Varaksina, I. V., Karlova, G. A., Kochnev, B. B., Nagavitsin, K. E., Postnikov, A. A., Filippov, Yu. F.
• Format: Article
• Language: English
• Subjects: Basins; Boreholes; Cambrian; Drilling; Earth and Environmental Science; Earth Sciences; Fossils; Geology; Mesozoic; Petroleum; Petroleum geology; Sedimentary basins; Studies
• ISSN: 1028-334X; 1531-8354
• DOI: 10.1134/S1028334X09020093

Until recently, information about pre-Mesozoic deposits in the eastern part of the West Siberian megabasin, the largest petroleum basin in the world, was scanty. In the 1980s-1990s, as a result of regional geophysical works and the drilling of the Tyya-1, Vezdekhodnaya-4, Lemok-1, and Averinskaya-150 bore-holes, a great scope of new information was acquired, the analysis of which made it possible not only to create a stratigraphic outline and to reconstruct geo-dynamic and paleogeographic depositional environments for pre-Mesozoic deposits in the West Siberian megabasin, but to substantiate the distinguishing of a new late Proterozoic-Cambrian sedimentary basin on the left bank of the Yenisei River as well. Parametric borehole (BH) Vostok-3, which was drilled in 2006 down to the depth of 5002 m with detailed coring, penetrated the section of carbonate-type deposits within the interval of 50023870 m. The late Vendian CloudinaNamacalathusPlatysolenites fossil assemblage previously unknown on the territory of Siberia has been established in these deposits.