Abstract
Domanic (and domanicoid) deposits are in a great interest of researchers and oil companies, since they possess authigenic oil and gas content. The article presents the results of study outcrops in the Volga-Ural and Timan-Pechora basins. The stratigraphic interval included sediments from the Middle Frasnian stage of the Upper Devonian to the Turnasian stage of the Lower Carboniferous. The main types of rocks were characterized by microscopic examination of thin sections and geochemical parameters of organic matter. It is shown that the domanic deposits of the Timan-Pechora basin are similar in structure and lithological composition to the deposits of the Volga-Ural Basin. The upper part of the domanic section is distinguished by the predominance of the carbonate-siliceous type of rocks over the kerogen mixed varieties. According to the geochemical parameters, the organic matter in the rocks of the sheltered deposits of the Volga-Ural and Timan-Pechora basins belongs to type II, but on the outcrops of the Volga-Ural region, the organic matter of the high-carbon sequence is more mature than on the outcrops of Timan-Pechora basin.
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