Geochemical research
Section editor – PhD in geology and mineralogy Bazhenova T.K.
| 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. |
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| 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 |
| DOI | https://doi.org/10.17353/2070-5379/41_2017 |
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Bushnev D.A., Burdelnaya N.S. Organicheskoe veschestvo siluriiskih otlojenii podnyatiya Chernova [Organic matter in Silurian rocks from the Chernov uplift] // Geochemistry international, 2012, Vol. 50, no. 7, p. 683–691.
Chernov G.A. Paleozoi Bolshezemelskoi tundri i perspektivi ego neftegazonosnosti [Paleozoic of the Bolshezemelskaya tundry and prospects of its oil and gas bearing sections]. Moscow: Nauka, 1972, 318 p.
Epstein A.G., Epstein J.B., Harris L.D. Conodont color alteration – an index organic metamorphism / U. S. Geological Survey Professional Paper 995, 1977. P. 27.
Galimov Е.М. Isotope organic geochemistry // Organic Geochemistry. 2006. Vol. 37. P. 1200–1262. DOI: https://doi.org/10.1016/j.orggeochem.2006.04.009
Hunt J. Geologiya i geokhimiya nefti i gasa [Petroleum geochemistry and geology]. Moscow: Mir, 1982, 703 p.
Kontorovich A.E., Bogorodskaya L.I., Golyshev S.I. Zakonomernosti frakcionirovaniya izotopov ugleroda v sedikahitah [Regularities of fractionation isotopes of carbons in sedikahits] // Russian Geology and Geophysics, 1985, Vol. 9, p.34–42.
State geological map of the Russian Federation. Scale 1:1000000 3rd generation. Urals. Sheet Q-41 - Vorkuta / M.A. Scisckin, Y.E. Faybusovich, A.P. Astapov, A.S. Voronin, E.V. Molchanova. St. Petersburg: VSEGEI, ZapSibGeoNATS, 2013.
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