Prospects of Shale Oil Bazhenov Formation in the South-East of Western Siberia

Goncharov, I.V.; Samoilenko, V. V.; Oblasov, N.

doi:10.2118/171170-ms

Cited by 3 publications

(4 citation statements)

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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%

“…Content and isotope composition of the total sulfur is also different for the rocks from the alginite-rich, host deposits, and tuff. For the alginite-rich layers, the δ 34 Stot values range from −6.0 to −18.5‰ with a total sulfur content of 1.37 to 2.75 wt.%. For the host rocks, we detect a predominance of lighter sulfur, i.e., the δ 34 Stot values varies from −17.3 to −26.0‰ and for Stot, from 3.71 to 4.36%.…”

Section: Isotope Composition Of C N and Smentioning

confidence: 99%

“…For the alginite-rich layers, the δ 34 Stot values range from −6.0 to −18.5‰ with a total sulfur content of 1.37 to 2.75 wt.%. For the host rocks, we detect a predominance of lighter sulfur, i.e., the δ 34 Stot values varies from −17.3 to −26.0‰ and for Stot, from 3.71 to 4.36%. Tuffs demonstrate the heaviest sulfur isotope ratio (Figure 10b).…”

Section: Isotope Composition Of C N and Smentioning

confidence: 99%

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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%

Section: Isotope Composition Of C N and Smentioning

confidence: 99%

Section: Isotope Composition Of C N and Smentioning

confidence: 99%

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Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

et al. 2021

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“…The chemical composition of the organic matter corresponds to kerogen type II (Goncharov et al, 2014). This indicates a high potential for hydrocarbon occurrence that could be explored for oil and gas.…”

Section: Geological Settingmentioning

confidence: 93%

The nature, origin and significance of luminescent layers in the Bazhenov Shale Formation of West Siberia, Russia

Wilson

Lopushnyak

et al. 2019

Marine and Petroleum Geology

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Argillites that strongly luminesce under UV radiation were detected in the Bazhenov Shale Formation (BSF) of the West Siberian Basin during routine core examination and found to be persistent over a wide lateral area. The mineralogy and fabric of these luminescent layers were characterized by optical and fluorescence microscopy, SEM, TEM, XRD and IR methods. Optical and fluorescence microscopy showed that the luminescent layers were to a large extent derived from volcanic ash falls and could be described as meta-tuffites, although normal detrital sedimentation continued at the same time. The layers have a thickness of several mm to a maximum of 3-4cm and can be defined as a clay-rich regional horizons. XRD showed that two principal clay minerals were present, namely a kaolinite, possibly with some dickite stacking, (kaolin-rich) and a mixed-layer illite-smectite (I/S) with R1 to R2 ordering similar to that found in K-bentonite. Total organic matter in the luminescent layers is much lower than that in the enclosing BSF clayey-silty siliceous sediments above and below as shown by pyrolytic analyses. Evidence is presented that the luminescent characteristic of the argillites is related to their clay mineralogy, specifically to their content *Revised Manuscript (clean copy) Click here to view linked References 2 of kaolin minerals, although a contribution from nitrogenous organic matter cannot be entirely discounted. In some ways the luminescent argillites can be compared with bentonites associated with ash transformations or with tonsteins in coal beds, which are also derived from volcanic ash falls and contain highly crystalline kaolinite. However, tonsteins originate at or near land surface whereas the argillites were apparently formed in the deep ocean. But just as tonsteins can be used for detailed stratigraphic studies and are valuable in the context of coal exploration, so may the luminescent argillites prove to be significant both stratigraphically and in the search for economic hydrocarbon deposits, bearing in mind that their clay mineralogy may be sensitive to temperature and depth of burial and related to their placement in the oil and gas window.

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Geochemical Trends Reflecting Hydrocarbon Generation, Migration and Accumulation in Unconventional Reservoirs Based on Pyrolysis Data (on the Example of the Bazhenov Formation)

et al. 2021

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The current study is devoted to the determination and interpretation of geochemical trends reflecting hydrocarbon generation, migration and accumulation in unconventional reservoirs; the study is performed on the Bazhenov shale rock formation (Western Siberia, Russia). Results are based on more than 3000 Rock-Eval analyses of the samples from 34 wells drilled in the central part of the West Siberian petroleum basin, which is characterized by common marine sedimentation environments. Pyrolysis studies were carried out before and after the extraction of rocks by organic solvent. As a result, we have improved the accuracy of kerogen content and maturity determination and complemented the standard set of pyrolysis parameters with the content of heavy fraction of hydrocarbons. The data obtained for the wells from areas of different organic matter maturity was summarized in the form of cross-plots and diagrams reflecting geochemical evolution of the source rocks from the beginning to the end of the oil window. Interpretation of the obtained results revealed quantitative trends in the changes of generation potential, amount, and composition of generated hydrocarbons in rocks at different stages of oil generation process. The analysis of geochemical trends allowed us to improve approaches for the productivity evaluation of the formation and study the effect of organic matter maturity on distribution of productive intervals of different types.

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Prospects of Shale Oil Bazhenov Formation in the South-East of Western Siberia

Cited by 3 publications

References 3 publications

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

The nature, origin and significance of luminescent layers in the Bazhenov Shale Formation of West Siberia, Russia

Geochemical Trends Reflecting Hydrocarbon Generation, Migration and Accumulation in Unconventional Reservoirs Based on Pyrolysis Data (on the Example of the Bazhenov Formation)

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