Estimation of the trace element composition of shale formations

Пунанова, С. А.; Nukenov, D.

doi:10.29222/ipng.2078-5712.2019-24.art5

Cited by 4 publications

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“…In such reservoir conditions, transformation of OM and kerogen can be industrially feasible. Moreover, the given approach seems to be very promising, as the content of trace elements, which are capable of exhibiting catalytic properties, is very high in kerogen-containing reservoir rocks [22]. It is significant to note that the interaction of supercritical water and hydrocarbons is always carried out by evolving gases, among which CO 2 is very attractive, as it swells oil and lowers oil viscosity [23].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2021

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Composition and Distribution of Microelements in Rocks, Extracts, and Asphaltenes from Domanik Deposits of Various Lithologo-Facial Types of Romashkino Oilfield

et al. 2021

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Influence of Supercritical Water on the Composition and Distribution of Microelements in Resins, Asphaltenes, Kerogens, and Rocks of Tatarstan Domanik Deposits of Different Lithological Types

et al. 2023

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A comparative study of changes in the microelemental composition and distribution in resins, asphaltenes, and kerogens from Tatarstan Domanik rocks, occurring under the action of supercritical water (SCW) at 374°С and a pressure of 22–24 MPa, was made. The samples studied belong to different lithological types; they were taken from carbonate–siliceous deposits of the Romashkino and Tavel oilfields and from carbonate deposits of the Bavly oilfield. The specific features of distribution of different microelements (MEs) in rocks and rock organic matter (OM) components were revealed by inductively coupled plasma mass spectrometry (ICP-MS). The major MEs are Fe > Ti > Ni > Zn > V > Cr > Cu with the concentrations from 100 to 8600 ppm. The total ME content of rocks from these deposits is 1.14, 0.23, and 0.38%, respectively. The ME content of resins and asphaltenes does not exceed 0.3 and 2%, respectively. The highest ME content, 8%, is observed in kerogens. The carbonate–siliceous rocks from different deposits with Сorg 7.07 and 1.90% differ from the carbonate rock with low Сorg (0.33%) in that the ME concentration in them is maximal. On the other hand, the ME content of resins and asphaltenes from the carbonate rocks is higher compared to the carbonate–siliceous rock samples. The concentrations of Fe, Cu, As, Se, Pb, and Bi in kerogens of all the types decrease under the action of SCW. In the transformed resins and asphaltenes from carbonate–siliceous rocks, the V and Ni concentrations appreciably decrease, whereas in kerogens their concentrations do not change noticeably. The demetalation processes lead to the ME redistribution between the OM components and mineral surface of the rocks.

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Estimation of the trace element composition of shale formations

Cited by 4 publications

References 0 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

Composition and Distribution of Microelements in Rocks, Extracts, and Asphaltenes from Domanik Deposits of Various Lithologo-Facial Types of Romashkino Oilfield

Influence of Supercritical Water on the Composition and Distribution of Microelements in Resins, Asphaltenes, Kerogens, and Rocks of Tatarstan Domanik Deposits of Different Lithological Types

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