Geochemical technique of organic matter research in deposits enrich in kerogene (the Bazhenov Formation, West Siberia)

Kozlova, Elena; Фадеева, Н. П.; Калмыков, Г. А.; Balushkina, N. S.; Пронина, Н. В.; Poludetkina, E. N.; Костенко, О.В.; Yurchenko, A. Yu.; Борисов, Р. С.; Bychkov, A. Yu.; Калмыков, А. Г.; Khamidullin, R. A.; Strel’tsov, E. D.

doi:10.3103/s0145875215050075

Cited by 32 publications

(8 citation statements)

References 4 publications

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“…The Bazhenov Formation organic matter, its generalized structure, and composition have been analyzed in a range of previous studies [33][34][35][36][37]. Total organic carbon concentration varies from 1 to 25-30 wt.% (mean 8-9 wt.%) and the initial hydrogen index (HI 0 ) values range between 650 and 715 mg HC/g TOC [38][39][40].…”

Section: Geological Settingmentioning

confidence: 99%

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

et al. 2021

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In this study, we identified the luminescent layers containing a significant amount of alginite in the Upper Jurassic–Lower Cretaceous Bazhenov Formation named “the alginite-rich layers”. Lithological and geochemical methods were used to determine distinctive features of these layers and to evaluate their impact on the total petroleum generation potential of the Bazhenov Formation. We have shown that the composition of the alginite-rich layers differs significantly from the organic-rich siliceous Bazhenov rocks. Rock-Eval pyrolysis, bulk kinetics of thermal decomposition, elemental analysis, and the composition of pyrolysis products indicate type I kerogen to be the predominant component of the organic matter (OM). Isotope composition of carbon, nitrogen, and sulfur was used to provide insights into their origin and formation pathways. The luminescent alginite-rich layers proved to be good regional stratigraphic markers of the Bazhenov Formation due to widespread distribution over the central part of Western Siberia. They can also be applied for maturity evaluation of the deposits from immature to middle of the oil window, since the luminescence of the layers changes the color and intensity during maturation.

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Section: Geological Settingmentioning

confidence: 99%

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

et al. 2021

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“…Processing of the obtained data included calculation of hydrogen index HI = S2/TOC × 100, oxygen index OI = S3/TOC × 100, productivity index PI = (S1)/(S1 + S2) and other pyrolytic parameters. To exclude the influence of heavy hydrocarbons during maturity estimates, pyrolysis of rocks before and after extraction was performed [45,46].…”

Section: Methodsmentioning

confidence: 99%

Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia

et al. 2021

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This paper addresses potential application of data on stable carbon and oxygen isotope composition of carbonates for study of organic rich source rocks on the example of the Late Jurassic–Early Cretaceous Bazhenov Formation (West Siberian petroleum basin, Russia). Geochemical studies were conducted for sections located in central (most productive) and peripheral (northern and southern) regions of the Bazhenov Formation distribution area, containing deposits formed under different conditions. We identified key factors impacting stable isotope composition of carbonate minerals and established relation of their isotope composition to the formation conditions. Using a thermodynamic model of carbon and oxygen isotope exchange in the carbonate–water–carbon dioxide system, it is shown that variations in the isotope composition of secondary carbonates are affected by isotopic composition of primary carbonates in sediments and by the isotope exchange reactions with water and carbon dioxide, generated during the source rocks transformation. Our results demonstrate that stable isotope data for carbonates in the Bazhenov Formation together with standard geochemical methods can be efficiently applied to determine sedimentation conditions and secondary alteration processes of oil source rocks.

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“…In the vast area of the West Siberian Basin, the nature of OM remains the same and is represented by type II kerogen. Its phase composition depends on OM maturity [22,23]. The Bazhenov Formation is increased in gamma-ray logging values associated with an increased uranium content.…”

Section: Regional Settingsmentioning

confidence: 99%

Uranium in Source Rocks: Role of Redox Conditions and Correlation with Productivity in the Example of the Bazhenov Formation

et al. 2022

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The paper reports comprehensive analysis of different factors affecting uranium content in oil source rocks and the relationship between uranium content and productivity of source rocks. The analysis of data for 13 wells of the Bazhenov Formation (Western Siberia, Russia) was carried out. The uranium content of the rocks was measured by gamma-ray spectrometry on core samples. In order to analyze factors affecting uranium accumulation in source rocks, we studied content and characteristics of organic matter (Rock-Eval pyrolysis), and also mineral, element, and isotope composition of rocks. We have shown that redox conditions at the sedimentation stage have the most pronounced impact on the uranium accumulation in the rocks of the Bazhenov Formation. It was also shown that productive intervals, containing increased amounts of mobile hydrocarbons, are characterized by low (<20 ppm) concentration of uranium. However, the intervals, containing phosphorite minerals may show better reservoir properties and oil saturation at higher concentration of uranium. The analysis of correlations and relationships between uranium content and Rock-Eval pyrolysis indexes (oil saturation index and productivity index) enabled formulation of criteria for selection of oil-saturated intervals using the spectral gamma and pulsed neutron spectroscopy log data.

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Geochemical technique of organic matter research in deposits enrich in kerogene (the Bazhenov Formation, West Siberia)

Cited by 32 publications

References 4 publications

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia

Uranium in Source Rocks: Role of Redox Conditions and Correlation with Productivity in the Example of the Bazhenov Formation

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