|Article # 41_2017||submitted on 09/07/2017 displayed on website on 12/11/2018|
|15 p.||Kotik I.S., Kotik O.S., Valyaeva O.V., Sokolova L.V.|
|Silurian and Lower Devonian petroleum source rocks of the Chernov Ridge (Timan-Pechora Basin, Russia)|
|The article presents the results of geochemical research of Silurian and Lower Devonian sequences on the Chernov ridge. The main part of the section is represented by petroleum source rocks with (TOC concentrations of 0,1–0,5%). Petroleum source rocks with increased contents of organic matter (> 0,5%) belong to clay-carbonate intervals in Silurian part of the section and layers of bituminous dolomites in the Lower Devonian. The hydrocarbon composition of the saturated fraction of bitumen in the Silurian-Lower Devonian deposits show a sapropel organic matter, probably of a different genetic types – plankton and marin algae. The isotopic composition of organic carbon (?13С, ‰) of bitumen part (30,1–32,6‰) and kerogen component (30,9–31,1‰) confirms the sapropel genesis of organic matter. The level of catagenetic transformation, estimated by the conodont colour alteration index, indicates that the Silurian-Lower Devonian deposits are in the main zone of oil generation (subdivision of the catagenesis MK1-2). The process of hydrocarbon generation is confirmed by the presence of bitumen throughout the section of the Silurian and Lower Devonian sequences.
Keywords: Silurian and Lower Devonian sequences, source rock, organic matter, bitumen, isotopic composition of organic carbon, Chernov ridge, Timan-Pechora Basin.
|article citation||Kotik I.S., Kotik O.S., Valyaeva O.V., Sokolova L.V. Neftegazomaterinskie porody siluriyskikh i nizhnedevonskikh otlozheniy zapadnoy chasti podnyatiya Chernova [Silurian and Lower Devonian petroleum source rocks of the Chernov Ridge (Timan-Pechora Basin, Russia)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2017, vol. 12, no. 4, available at: http://www.ngtp.ru/rub/1/41_2017.pdf|
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