Hydrothermal transformations of organic matter of low permeability rocks from domanic formation of the romashkino oil field

Kayukova, G. P.; Mikhailova, A. N.; Kosachev, I. P.; Pronin, Nikita; Sotnikov, O. S.; Evdokimov, A.M.; Хисамов, Р С

doi:10.1080/10916466.2018.1490764

Cited by 1 publication

(10 citation statements)

References 15 publications

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“…Domanic rock samples from the Zelenogorskaya area (depth 1379–1385.5 m)sample 1, and Berezovskaya area (depth 1712.5–1718.5 m)sample 2, of the Romashkino oil field before and after hydrothermal experiments were evaluated by the thermal analysis method in the temperature interval of 20–1000 °C. The content of OM from thermal analysis data was estimated on the basis of mass loss of rock samples in the temperature interval of 200–600 °C. ,,, The mass loss above 600 °C in rock samples was probably the result of thermal decomposition of carbonates, while the mass loss from 20 to 200 °C was due to evaporation of light hydrocarbon fractions and removal of free and trapped water in the case of mineral clay. , …”

Section: Resultsmentioning

confidence: 99%

“…The heating rate to the temperature of the experiment was 10 °C/min. As the temperature in the system was increased, the vapor pressure was elevated at 200 °C to 6.3 MPa and at 350 °C to 17 MPa. , …”

Section: Methodsmentioning

confidence: 99%

“…To evaluate the changes in the structural-group composition of the investigated extracts, the spectral coefficients were used. They are defined as the ratio of the optical density value at the maxima of the corresponding absorption bands: C 1 = D 1600 /D 720 (aromaticity); C 2 = D 1710 /D 1465 (oxidation); C 3 = D 1380 /D 1465 (branching); C 4 = (D 720 + D 1380 )/D 1600 (paraffinicity); and C 5 = D 1030 /D 1465 (sulfurization index). ,, …”

Section: Methodsmentioning

confidence: 99%

“…According to the modern concepts, kerogen is a potential source of hydrocarbon generation. ,,− However, Domanic deposits are poorly studied and developed in terms of shale oil production. The nature of hydrocarbon accumulations in Domanic sediments and the possibility of the formation of hydrocarbons from kerogen have been studied for decades by studying the material composition of rocks and modeling the processes of kerogen maturation under hydrothermal and pyrolytic influences. ,− …”

Section: Introductionmentioning

confidence: 99%

“…Kayukova et al 26,38 used the Rock-Eval pyrolysis method to evaluate the oil and gas potential of Domanic carbonate rocks from the Dankovo−Lebedyansky horizon of the Zelenogorskaya area of the Romashkino oil field. 26 The content of TOC in investigated rock samples is 1.89−3.03%. It is possible to assume the migration type of hydrocarbons in the Domanic deposits.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Impact on Hydrocarbon Generation from Low-Permeable Domanic Sedimentary Rocks with Different Lithofacies

et al. 2021

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This study is intended to reveal the impact of hydrothermal treatments at temperatures of 200, 250, 300, and 350 °C on organic matter (OM) of low-permeable rocks of two different lithofacies types (carbonate and carbonate–siliceous rocks) from Domanic deposits of Upper Devonian Tatarstan. Autoclave experiments were carried out in a carbon dioxide environment. The content of OM and the yield of rock extracts, as well as the stability of kerogen structures to hydrothermal influences, were evaluated. The content of saturated hydrocarbons in the rock extracts increases after the hydrothermal transformation of kerogen and high-molecular-weight compounds, while the content of aromatic hydrocarbons and asphaltenes decreases. The results of molecular weight distribution of normal alkanes and isoprenoids show that rock extracts according to the classification of A. Petrov correspond to the A type of crude oil. Exposing hydrothermal factors on Domanic rocks at low and high temperatures provides more total extraction of hydrocarbons from rocks. The most intensive kerogen transformation process occurred at 350 °C. Hydrothermal impact on the carbonate rocks leads to almost complete transformation of kerogen with the formation of hydrocarbons, while in carbonate–siliceous rock samples, significant part of kerogen does not undergo transformation. The specific features of some biomarkers such as alkanes, aryl isoprenoids, steranes, and terpanes in petroleum products before and after hydrothermal treatment were discussed. The results indicate the general genetic nature of OM, but different geochemical conditions of its maturation in the sedimentary strata. Thus, steam injection leads to different hydrocarbon generating potential from different reservoir rocks.

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