Criteria for oil and gas search in domanic deposits of the Volga-Ural basin

Stoupakova, A.V.; Fadeeva, N.P.; Калмыков, Г. А.; Bogomolov, A.Kh.; Kiryukhina, T.A.; Коробова, Н. И.; Shardanova, T.A.; Суслова, А.А.; Sautkin, R.S.; Poludetkina, E.N.; Kozlova, Elena; Mitronov, D.V.; Korkots, F.V.

doi:10.18599/grs.61.2.7

Cited by 37 publications

(11 citation statements)

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“…The observed decrease in the content of free radicals in the composition of asphaltenes with increasing experimental temperature indicates the separation of alkyl substituents and subsequent carbonization processes It is important to note a feature of the EPR spectrum of asphaltenes after the experiment in supercritical water at 420°C associated with the appearance on the vanadyl line of a super-ultrafine cleavage spectrum from 14 N nitrogen nuclei (Figure 5b). The number of observed lines and the distance between them (0.28 mT) corresponds to the ultrafine spectrum of four equivalent 14 N nitrogen atoms (I = 1), presented in [29,30]. This spectral peculiarity indicates the presence of a vanadyl ion in the porphyrin ring of monocycloalkylporphyrins having a mass 2 units less than that of alkyl porphyrins.…”

Section: Characterization Of Asphaltenes By Electron Paramagnetic Resonance (Epr)mentioning

confidence: 92%

Sub- and supercritical water in the processes of conversion of Domanik rock organic matter

et al. 2021

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Studies on the conversion of organic matter of high-carbon Domanik (siliceous-clay carbonate) rock of the Romashkinskoye deposit with a mineral content Corg of 7.07% in sub- and supercritical water have been carried out. It was shown that subcritical water at a temperature of 320°С and 17.0 MPa leads to a partial decomposition of the kerogenic structure, increasing the yield of bitumen from 3.12 to 3.98%, and a more complete recovery of asphaltenes and heavy C22-C30 n-alkanes from the rock sample. Supercritical water at temperatures of 374 and 420°C and pressures above 24.4 MPa leads to intensive formation of hydrocarbon and inorganic gases in the processes of kerogen decomposition, destruction of aliphatic substituents from condensed heteroatomic structures of resins and asphaltenes, and the carbonate component of Domanik rock. Degradation of the organic matter of the Domanik rock is also accompanied by the formation of saturated hydrocarbons with an increased content of light C12-C21 n-alkanes, and carbonaceous substances, such as carbene-carboids. Changes in the structure of asphaltenes and their paramagnetic properties were determined by the EPR method. The influence of sub- and supercritical water on phase changes in the composition of rock minerals, as well as on the yield and composition of formed gases, was revealed.

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Section: Characterization Of Asphaltenes By Electron Paramagnetic Resonance (Epr)mentioning

confidence: 92%

Sub- and supercritical water in the processes of conversion of Domanik rock organic matter

et al. 2021

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“…Geochemical methods play one of the most significant roles in the overall complex of studies aimed at predicting the oil and gas potential of the Domanik-type deposits. Their use in conjunction with other geological and geophysical methods significantly increases the information-richness of the assessment (Tissot and Velte, 1981;Espitalie et al, 1993;Stupakova et al, 2015;Carayannis et al, 2019;Ilinova and Chanysheva, 2020).…”

Section: Methodsmentioning

confidence: 99%

“…In the Timan-Pechora and Volga-Ural provinces, according to VNIGRI studies (Neruchev, 1986;Belonin and Makarevich, 1994;Bazhenova et al, 2008;Bushnev and Burdelnaya, 2013;Prischepa et al, 2014;Stupakova et al, 2015;Averyanova and Morariu, 2016; Averyanova, 2017;Belozerov and Gubaidullin, 2020), dense clay, carbonate-clay and siliceous-clay rocks, primarily enriched with scattered OM, in the range of the Upper Devonian (Middle Frasnian-Famenian)-Lower Carboniferous (Tournaisian) parts of the section are classified as "Domanik-type" deposits. The stratigraphic range of their development is quite wide (Rzhonsnitskaya and Kulikova, 1990) from the actual Domanik (Semilukian) horizon of the Middle Frasnian age, including the Upper-Frasnian-Lower-Famenian (Vetlasyansky, Sirachoysky, Yevlanovsky, Livensky, Volgogradsky, Zadonsky, Yelets horizons) and Upper-Famenian-Lower Carboniferous (Lebedinsky, Zelenetsky horizons and Tournaisian stage) deposits.…”

Section: Frontiers In Earth Sciencementioning

confidence: 99%

Raw material base of Russia’s unconventional oil and gas reserves (hydrocarbons shale strata)

et al. 2022

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One of the most controversial and discussed issues related to the development of the hydrocarbon raw material base in recent years is the issue of exploring the possibilities of involvement in industrial development accumulations associated with high-carbon shale complexes that are widespread in Russia. Interest therein is supported by the system of benefits provided by the Government for low-permeability reservoirs and special preferential conditions for geological exploration provided to subsurface users in recent years. An important effect was also achieved by developing a methodology for reserves assessment and placing on the state balance a whole series of fields with oil deposits in the Domanik formation of the Volga-Ural oil and gas province (OGP). Simultaneously, the assessment of the potential of high-carbon formations in the Russian Federation mainly continues to be the subject of scientific research without an applied component, due to its inapplicability for selecting both the most significant areas for exploration and the possibilities of using it to justify investments. Here, the uncertainty is related to the estimation of possible production levels with an unclear correlation between development technologies, filtration and reservoir properties, and the potential of high-carbon strata. This study discusses two approaches that allow assessment of the potential of the main high-carbon strata distributed in Russia.

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“…Under the conditions of tectonic and volcanic activation in the Volga-Ural region, Domanic deposits with a high content of OM were accumulated. 34 The estimated oil generation potential of Domanic rocks is 700 million tons. 20 2.2.…”

Section: Methodsmentioning

confidence: 99%

“…This field is located in the crest of the South Tatar Arch, one of the major structural elements of the Volga-Ural petroleum basin. Under the conditions of tectonic and volcanic activation in the Volga-Ural region, Domanic deposits with a high content of OM were accumulated . The estimated oil generation potential of Domanic rocks is 700 million tons …”

Section: Methodsmentioning

confidence: 99%

Conversion of High-Carbon Domanic Shale in Sub- and Supercritical Waters

et al. 2019

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This paper presents the results of the conversion of high-carbon Domanic rock from sediments of the Semiluki-Mendym horizon of the Volga-Ural petroleum Basin in sub-and supercritical waters at temperatures of 320, 374, and 420 °C in a neutral nitrogen environment for 1 h. The initial sample is a siliceous-clay carbonate rock with an organic matter content of 10.6 wt %, the largest part of which is insoluble kerogen. The end products of all experiments are characterized by an increase in the content of saturated hydrocarbons with a noticeable decrease in the content of resins and asphaltenes. The highest yield of the extract (3.98 against 3.12 wt %) compared with the initial rock is observed in the experiment in subcritical water at 320 °C as a result of the preferred degradation of resins and more complete extraction of asphaltenes from the rock. With an increase in temperature to supercritical water conditions at 374 °C and pressure up to 24.6 MPa, kerogen transformation processes are observed due to the C−C, C−N, and C−O bonds destruction with the formation of low-boiling saturated hydrocarbons and high-carbon components such as carbene−carboids in the products of the experiments. The highest yield of saturated hydrocarbons occurs at the experiment of Domanic rock in supercritical water at 420 °C and 24.4 MPa. Under these conditions, in comparison with lower temperatures, the yield of the extract from the rock decreases due to intense gas formation. In the composition of the gases formed in the experiments, there are hydrocarbons: CH 4 , C 2 H 6 , C 3 H 8 , and i-C 4 H 10 , indicating the destruction of C−C bonds. Dehydrogenation processes in supercritical water at 420 °C are noted by the presence of H 2 in the reaction system. Structural and phase changes in the mineral composition of Domanic rock were discovered as a result of supercritical water exposure at 374 and 420 °C. In particular, the structure of mica was changed due to the isolation of a separate phase of montmorillonite from it.

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Criteria for oil and gas search in domanic deposits of the Volga-Ural basin

Cited by 37 publications

References 0 publications

Sub- and supercritical water in the processes of conversion of Domanik rock organic matter

Sub- and supercritical water in the processes of conversion of Domanik rock organic matter

Raw material base of Russia’s unconventional oil and gas reserves (hydrocarbons shale strata)

Conversion of High-Carbon Domanic Shale in Sub- and Supercritical Waters

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