New type of Cambrian section in eastern part of West Siberian Plate ( based on Vostok-1 stratigraphic well data )
2008; Elsevier BV; Volume: 49; Issue: 11 Linguagem: Inglês
10.1016/j.rgg.2008.06.011
ISSN1878-030X
AutoresА. Э. Конторович, А.И. Варламов, V.G. Emeshev, А.С. Ефимов, A.G. Klets, A. V. Komarov, Vladimir Kontorovich, I. V. Korovnikov, S.V. Saraev, Yu. F. Filippov, Ирина Валерьевна Вараксина, В.Н. Глинских, V. A. Luchinina, N. V. Novozhilova, Tatyana V. Pegel, N. V. Sennikov, А. В. Тимохин,
Tópico(s)Geological and Geophysical Studies
ResumoAbstract A new type of Cambrian section penetrated by the Vostok-1 stratigraphic test well in the east of the West Siberian Plate, Tomsk Region, is described in terms of paleontology. It can be considered a key section for this region. According to a complex of geological and geophysical characteristics, the section in the depth range of 2766–5010 m was divided into the Churbiga, Paidugina, Pudzhelga, Podelga, Kondes, Shedelga, and Pyzhina Formations, and their first description was made. The Cambrian section in Vostok-1 well is most similar to those of the Kotui-Igarka area of the northwestern Siberian Platform, where Cambrian deposits formed in the pre-reef zone of an open sea basin. In the lower section of the borehole the highly carbonaceous siliceous-argillaceous-carbonate Paidugina Formation was stripped, which is an analog of the Lower-Middle Cambrian Shumnaya and Kuonamka Formations of the Siberian Platform. The Paidugina Formation, which accumulated on the shelf and slope of the open sea facing the Paleo-Asian ocean, is considered oil-producing and suggests the high petroleum potential of the cis-Yenisei basin. Also, a highly promising generation-accumulation petroleum system has been revealed.
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