The role of Domanik deposits in the formation of oil pools in the central areas of the Volga–Ural petroleum province (<i>Buzuluk depression</i>)

Kiseleva, Yu.A.; Zheglova, T.P.; Dakhnova, M.V.; Mozhegova, S.V.; Nazarova, E.S.; Nechitailo, Galina S.

doi:10.1016/j.rgg.2016.09.007

Cited by 11 publications

(13 citation statements)

References 16 publications

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“…The hydrothermal impact on the rock samples smooths out these differences. The difference parameter, which indicates a relationship between the formation of its hydrocarbon composition with clay minerals [40,42,44]. This justifies the conclusions of some authors [32,33]; according to the pyrolysis data (see Table 1), hydrocarbons in the carbonate rocks of the Zelenogorskaya area are not syngenetic to the enclosing sediments, but are migration fluids.…”

Section: Zelenogorskaya Area Berezovskaya Areasupporting

confidence: 69%

“…However, the differences in their composition before and after the experiments are observed in the DIA/REG parameter (the ratio of regrouped C 27 20Sβα-diasterane to C 29 20Rααα-sterane; 1.29 and 0.36 versus 1.21 and 0.83, correspondingly). The oil from carbonate formations of the Dankovo-Lebedyan horizon of the Zelenogorskaya area has higher values of the given parameter, which indicates a relationship between the formation of its hydrocarbon composition with clay minerals [40,42,44]. This justifies the conclusions of some authors [32,33]; according to the pyrolysis data (see Table 1), hydrocarbons in the carbonate rocks of the Zelenogorskaya area are not syngenetic to the enclosing sediments, but are migration fluids.…”

Section: Zelenogorskaya Area Berezovskaya Areasupporting

confidence: 57%

“…All samples were diluted in carbon tetrachloride at a concentration of 10 −3 g/µL before being introduced into the device. Chromatograms were recorded, according to the total ionic current (TIC), followed by reconstruction of the molecular weight distribution of various types of compounds by characteristic ions: n-alkanes and acyclic isoprenoids (m/z 57 + 113), alkyltrimethylbenzenes (m/z 133 + 134), triterpanes ( m/z 191), steranes (m/z 217 + 259) and monoaromatic steroids (m/z 253) in saturated fractions; naphthalenes (m/z 128 + 142 + 156 + 170), phenanthrenes (m/z 178 + 192 + 206), benzothiophenes (m/z 147 + 161 + 175) and dibenzothiophenes (m/z 184 + 198 + 212) in aromatic fractions [39][40][41][42][43][44][45][46][47][48][49]. The processing of mass spectral data was carried out, using the Xcalibur program.…”

Section: Methodsmentioning

confidence: 99%

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Composition of Oil after Hydrothermal Treatment of Cabonate-Siliceous and Carbonate Domanic Shale Rocks

et al. 2021

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The hydrocarbon compositions of shale oils, generated from two different lithological–facial Domanic deposits of the Tatarstan Republic (Russia), were studied under hydrothermal impact with 30% of water addition in a 350 °С and CO2 environment. The samples were extracted from carbonate–siliceous rocks of the Semiluky–Mendym deposits of the Berezovskaya area, and carbonate deposits of the Dankovo–Lebedyan horizon of the Zelenogorskaya area of the Romashkino oil field. The distinctive features of rocks are in the composition and content of organic matter (OM), its thermal stability, as well as the structural-group composition of the shale oil products. The hydrothermal treatment of the rock samples increased the content of saturates and decreased the content of aromatics, resins and asphaltenes in the composition of crude oil. The decomposition of the polymer-like kerogen structure and destruction processes of high-molecular compounds, such as resins and asphaltenes, are accompanied with the formation of substances highly rich in carbons—carbenes and carboids. The contents of n-alkanes and acyclic isoprenoids increase in the composition of saturated hydrocarbons. According to the chemical classification of Al. A. Petrov, the character of the molecular mass distribution of such substances corresponds to oil type A1, which is considered paraffinic. The contents of dibenzothiophene, naphthalene and phenanthrene are increased in the composition of aromatic hydrocarbons, while the contents of tri-methyl-alkyl-benzene and benzothiophene are decreased. The increase in the aryl isoprenoid ratio (AIR = С13–С17/С18–С22) and maturity parameter (4-MDBT/1-MDBT) under the influences of hydrothermal factors indicates the increasing thermal maturity degree of the hydrocarbon system. The differences in the distribution behavior of saturated and aromatic hydrocarbons—biomarkers in rocks of various lithological-facies types, which are reasoned by different conditions of initial organic matter transformation as well as under the impact of hydrothermal factors—were revealed.

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Section: Zelenogorskaya Area Berezovskaya Areasupporting

confidence: 69%

Section: Zelenogorskaya Area Berezovskaya Areasupporting

confidence: 57%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Composition of Oil after Hydrothermal Treatment of Cabonate-Siliceous and Carbonate Domanic Shale Rocks

et al. 2021

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“…The OM composition of these rocks is characterized by a high concentration of resin-asphaltene substances and kerogen, which is a natural geopolymer with an irregular structure and is considered in many studies as a source of generation of petroleum hydrocarbons [4][5][6][7][8][9][10][11]. The issues of geological-geochemical environment of the formation of the organic matter (OM) of domanik strata, their spatial distribution, and assessment of their oil generation potential have also been considered in many studies [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Transformation of Organic Matter of Domanik Rock from the Romashkino Oilfield in Sub- and Supercritical Water

et al. 2020

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The transformation of the organic matter (OM) of low-permeable carbon-rich domanik rock of the Romashkino oilfield in sub-and supercritical water (SCW) at temperatures of 320, 374, and 420°C and pressures of 17, 24.6, and 24.4 MPa in a neutral medium has been studied. The original rock with a TOC content of 7% has a high oil generation potential and a low productivity index. The productivity index increases with an increase in the severity of the thermal treatment of the rock, which is due to intense kerogen degradation resulting in the formation of free hydrocarbons that are easy to recover from the rock. In rock extracts, in comparison with the original rock, the amount of saturated and aromatic hydrocarbons increases by more than two times and that of resin-asphaltene substances decreases. Distinctive features of the yields and compositions of rock extracts depending on the temperature of the experiments have been revealed. The highest yield of the extract was observed in the experiment with subcritical water at 320°C and associated with the degradation of resins and more complete extraction of asphaltenes and high-molecular-weight n-alkanes from the rock. Treatment in SCW at 374 and 420°C leads to intensive degradation of the kerogen structure involving the detachment of aliphatic chains from large fragments of kerogen and asphaltene macromolecules to form lower n-alkanes and carbon-rich substances, such as carbenes and carboids. The structure of asphaltenes becomes more condensed and oxidized in the SCW medium at 420°С, leading to a decrease in their paramagnetic properties. Using the EPR technique, the features of hyperfine splitting of the vanadyl complex line on 14 N nitrogen nuclei have been revealed in the spectrum of asphaltenes of the SCW experiment at 420°С, indicating specific changes in their structure.

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“…According to the indicators, Pr/n-C 17 , Ph/n-C 18, and Pr + Ph/nC 17 + nC 18 , which may reflect the level of catagenetic OM transformation or the influence of migration and biochemical processes of microbial degradation, the studied samples differ significantly, due to the different contents of n-alkanes [30,[37][38][39][40]. It is important to note that the values of these indicators for extracts from rocks well 106 are close to the values typical for oils from rocks below the deposited deposits of the Devonian age in a given area [10].…”

Section: Geofluidsmentioning

confidence: 99%

The Oil-Bearing Strata of Permian Deposits of the Ashal’cha Oil Field Depending on the Content, Composition, and Thermal Effects of Organic Matter Oxidation in the Rocks

et al. 2020

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The features of the oil-bearing capacity of the productive strata of Permian deposits in the interval of 117.5-188.6 m along the section of individual wells of the Ashal’cha field of heavy superviscous oil (Tatarstan) were revealed depending on the content, composition, and thermal effects of organic matter (OM) oxidation in the rocks. It is shown that the rocks are very heterogeneous in their mineral composition and in the content of both free hydrocarbons by extraction with organic solvents and insoluble OM closely associated with the rock. The total content of OM in rocks varies from 1.72 to 9.12%. The features of group and hydrocarbon composition of extracts from rocks are revealed depending on their mineral composition and the content of organic matter in them. According to the molecular mass distribution of alkanes of normal and isoprenoid structure, extracts from rocks are differentiated according to three chemical types of oil: type A1, in which n-alkanes of composition C14 and above are present, and types A2 and B2, in which n-alkanes are destroyed to varying degrees by processes microbial destruction, which indicates a different intensity of biochemical processes in productive strata of Permian sediments. These processes lead to a decrease in the amount of OM in the rocks and an increase in the content of resins and asphaltenes in the oil extracted from them, as well as an increase in the viscosity of the oil. Using the method of differential scanning calorimetry of high pressure, it was found that the studied rock samples differ from each other in quantitative characteristics of exothermic effects in both low-temperature (LTO) 200-350°С and high-temperature (HTO) 350-600°С zones of OM oxidation. The total thermal effect of destruction processes of OM depends on the content of OM in the rocks and its composition. The research results show that when heavy oil is extracted using thermal technologies, the Permian productive strata with both low and high OM contents will be involved in the development, and the general thermal effect of the oxidation of which will contribute to increased oil recovery.

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The role of Domanik deposits in the formation of oil pools in the central areas of the Volga–Ural petroleum province (Buzuluk depression)

Cited by 11 publications

References 16 publications

Composition of Oil after Hydrothermal Treatment of Cabonate-Siliceous and Carbonate Domanic Shale Rocks

Composition of Oil after Hydrothermal Treatment of Cabonate-Siliceous and Carbonate Domanic Shale Rocks

Transformation of Organic Matter of Domanik Rock from the Romashkino Oilfield in Sub- and Supercritical Water

The Oil-Bearing Strata of Permian Deposits of the Ashal’cha Oil Field Depending on the Content, Composition, and Thermal Effects of Organic Matter Oxidation in the Rocks

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