Яндекс.Метрика

Svetlana Ryzhkova, Aleksandr Klets, Yelena Belova

Издание: 32nd International Geological Congress, Florence, Italy, August 20-28, 2004: Abstracts Volume
Место издания: Florence , Год издания: 2004
Страницы: 826

Аннотация

Within southern West Siberia Callovian-Oxfordian deposits constitute a basal part of the oil-and-gas bearing plate complex. These deposits are the polyfacies units of the Vasyugan, Naunak and Tatarskaya Formations of marine, continental (flood plain-lacustrine-marshy) and lagoon-continental genesis, respectively. The Vasyugan Formation displays the transgressive-regressive composition and comprises dominantly mudstones down the section and mudstones with sandstone and coal interbeds up the section. The Naunak Formation is composed of sandstones, siltstones and mudstones alternating with rare coal beds. The Tatarskaya Formation consists of the variegated lumpy mudstones down the section and grey-green mudstones with siltstone interlayers up the section. Callovian-Oxfordian deposits, which constitute the Vasyugan regional horizon, occur transgressively onto Lower-Middle Jurassic deposits or rest directly on the pre-Jurassic folded basement. The latter is made up of sedimentary, volcanic-sedimentary, magmatic and metamorphic rocks that had been consolidated during periods of the Baykal, Caledonian, Early and Late Hercinian orogenies. The complex and long history of the territory development during pre-Jurassic time has been recorded in the mosaic composition of the pre-Jurassic basement surface, onto which the Jurassic basin had been occurred and evolved. The Tatarskaya, Vasyugan and Naunak Formations correlate formally in lithology and configuration with peculiarities of the geologic structure of the pre-Jurassic basement, i.e. both the area of deposition and surroundings, which served as source areas of clastic material transported into a sedimentary basin.This work was supported by grant RFBR 02-05-64993
индекс в базе ИАЦ: 024614