Anoxia in the Photic Layer of the Sedimentation Basin: Markers in the Oils of Tatarstan
- 11 Downloads
The source rocks of the oils in Tatarstan were determined to be formed under similar conditions, at anoxia in the photic layer of the sedimentation basin, with anoxia continuing throughout the whole time when the initial organic matter was accumulated, at a significant thickness of the H2S-infected layer. For some of the oils, disturbances in the anoxia may have occurred, or the thickness of the H2S-infected layer may have been reduced, and this resulted in a decrease in the content of anoxia markers in these oils. Biocenoses of microflora in the sedimentation layer contaminated with H2S show evidence of high stability. Transformation conditions of the buried organic matter in the course of diagenesis and catagenesis were uniform, as follows from the merely insignificantly varying relations between the depth of the complete hydrogenation and cyclization of the initial polyene aromatic carotenoids, the similarity in the molecular mass distributions of the destruction products of the C–C bond in C40 components, and the relatively small differences in ratios of the total concentration of monoaromatic compounds to the totals of hydrogenated analogues of the initial aromatic carotenoids. The source rocks of oils in Tatarstan can be identified based on analysis for concentrations of components that are anoxia markers in all of the Devonian rocks.
Keywords:Volga–Ural basin oils of Tatarstan anoxia markers aromatic hydrocarbons of oils Domanic Formation source rocks
This study was carried out under a government-financed research program for the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences.
- 2.O. A. Aref’ev, M. N. Zabrodina, G. V. Rusinova, and Al. A. Petrov, Biomarkers of oil of the Volga–Urals petroleum province, Neftekhimiya 34 (6), 483–502 (1994).Google Scholar
- 6.G. N. Gordadze and V. I. Tikhomirov, “Geochemical characteristics of oils and dispersed organic matter from the rocks of the Central Volga–Ural Basin: hydrocarbon biomarker data,” Geochem. Int. 43 (11), 1108–1123 (2005).Google Scholar
- 9.G. P. Kayukova, L. Z. Nigmedzyanova, G. V. Romanov, N. S. Sharipova, V. M. Smelkov, M. V. Dakhnova, T. P. Zheglova, and E. V. Khramova, “The composition and distribution of biomarker hydrocarbons in oils and bitumens from the Bavly area of the South-Tatarian Arch,” Petrol. Chem 44 (6), 407–415 (2004).Google Scholar
- 11.R. S. Khisamov, E. D. Voitovich, V. B. Liberman, N. S. Gatiyatullin, and S. E. Voitovich, Tectonic and Petroleum-Geological Zoning of Tatarstan (Fen Akad. Nauk RT, Kazan, 2006) [in Russian].Google Scholar
- 12.M. P. Koopmans, J. Koster, H. M. E. van-Kaam-Peters, F. Kenig, S. Schouten, W. A. Hartgers, J. W. de Leeuw, and J. S. S. Damste, “Diagenetic and catagenetic products of isorenieratene: Molecular indicators for photic zone anoxia,” Geochim. Cosmochim. Acta 60 (22), 4467–4496 (1996).CrossRefGoogle Scholar
- 13.I. A. Larochkina, Geological principles of Prospecting and Exploration of Petroleum Fields in Tatarstan (OOO PF Gart, Kazan, 2008) [in Russian].Google Scholar
- 14.Oil and Gas Fields of the USSR. A Textbook. Volume 1. European Part of the USSR, Ed. by S. P. Maksimov, (Moscow, Nedra, 1987) [in Russian].Google Scholar
- 15.Petroleum Potential of Tatarstan. Geology and Exploration of Petroleum Fields, Ed. by R. Kh. Muslyumov (Fen, Kazan, 2007) [in Russian]Google Scholar
- 18.M. B. Smirnov and E. N. Poludetkina, “A simple method for assesment of bioproduction under anoxic conditions in photic later during formation of dispersed organic matter of rocks and oils: mass-spectrometric data,” Mass-Spetctrometriya, 15 (2). 93–101 (2018a).Google Scholar
- 21.M. B. Smirnov, N. P. Fadeeva, R. S. Borisov and E. N. Poludetkina, The characteristics of the organic matter of the Upper Devonian domanik-type deposits in the northern and central regions of the Volga-Ural Basin according to saturated biomarkers composition,” Geochem. Int. 56 (2), 812–827 (2018)CrossRefGoogle Scholar
- 23.M. I. Zaidelson. E. Ya. Surikov, L. L. Kazmin, S. Ya. Vainbaum, and E. G. Semenova, “Specificis of generation, migration, and accumulaton of HC of the domanik formation,” Geol. Nefti Gaza, No. 6, (1990).Google Scholar