Geochemistry of Late Devonian oils of the Timan–Pechora basin

Бушнев, Д. А.; Burdelnaya, N. S.; Valyaeva, O. V.; Derevesnikova, A. A.

doi:10.1016/j.rgg.2016.09.009

Cited by 17 publications

(2 citation statements)

References 22 publications

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“…According to the amount of organic matter, researchers divide the Domanik type rocks into two main types, domanicites and domanicoids [33]. The domanicites are characterized by a high content of TOC-5.0%-22% (25%); in the domanicoids, the TOC content is lower-0.5%-5%, and organic matter is characterized by the humus-sapropel (I-II) type of kerogen [33][34][35][36][37]. According to pyrolytic studies, the DF refers to mature oil-producing rocks [38].…”

Section: Methodsmentioning

confidence: 99%

Alterations of Carbonate Mineral Matrix and Kerogen Micro-Structure in Domanik Organic-Rich Shale during Anhydrous Pyrolysis

et al. 2022

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The study of organic-rich carbonate-containing shales after heating is an important task for the effective application of in-situ thermal kerogen conversion technologies implemented for these types of rocks. This research was conducted to study changes in the rocks of the Domanik Formation after high-temperature treatment, taking into account the nature of structural changes at the micro level and chemical transformations in minerals. The sample of organic-rich carbonate-containing shales of the Domanik Formation was treated in stages in a pyrolizer in an inert atmosphere in the temperature range of 350–800 °C for 30 minutes at each temperature. By means of X-ray powder diffractometry (XRPD), HAWK pyrolysis, light and scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and computed micro-tomography, the characteristics of the rock before and after each heating stage were studied. The results showed significant alteration of the mineral matrix in the temperature range 600–800 °C, including the decomposition of minerals with the formation of new components, and structural alterations such as fracturing micropore formation. The organic matter (OM) was compacted at T = 350–400 °C and fractured. The evolution of void space includes fracture formation at the edges between rock components, both in organic matter and in minerals, as well as nanopore formation inside the carbonate mineral matrix. The results obtained show what processes at the microlevel can occur in carbonate-containing organic-rich shales under high-temperature treatment, and how these processes affect changes in the microstructure and pore space in the sample. These results are essential for modeling and the effective application of thermal EOR in organic-rich shales.

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Section: Methodsmentioning

confidence: 99%

Alterations of Carbonate Mineral Matrix and Kerogen Micro-Structure in Domanik Organic-Rich Shale during Anhydrous Pyrolysis

et al. 2022

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“…The GC-MS investigations were performed using Shimadzu QP2010 Ultra instrument equipped with a DB-5 column. Details are described in Bushnev et al (2016Bushnev et al ( , 2017a. Belonin et al, 2004) showing the major morphostructural features of the study area (Chernyshev Swell and related units).…”

Section: Soluble Organic Matter Compositionmentioning

confidence: 99%

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Kotik

Журавлев

Maydl

et al. 2021

GeA

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Details of the Early-Middle Frasnian boundary interval of the Pymvashor River section (Timan-Pechora Basin, Cis-Urals, in the far north of European Russia) are revealed by biostratigraphically constrained carbonate (δ13Ccarb) and organic carbon (δ13Corg) stable data. The studied interval corresponds to the lower part of the Domanik Formation, which consists of interbedded limestone and shale beds. Organic-rich black shale that lacks bioturbation and benthic organisms indicates an oxygen-depleted depositional environment. Detection of isorenieratene derivatives in organic matter indicates that anoxia was present in the photic zone during deposition. The Pymvashor River section contains δ13Ccarb and δ13Corg isotope records related to the Early-Middle Frasnian isotope Event. The similarity between the Cis-Uralian (this study) and the Chinese δ13Ccarb and δ13Corg oscillations, including the twostep pattern of the recorded major positive excursions, suggests a robust correlation of the Late Devonian Early- Middle Frasnian isotope Event and minor intra-event excursions. Magnitude of variations and values of δ13Corg and δ13Ccarb in the punctata Zone in the Pymvashor River section are minor than those observed in the North American, Polish, and Chinese successions. Such difference may reflect specific variation of the local environments.

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Sedimentary characteristics and evolution of Domanik facies from the Devonian–Carboniferous regression in the southern Volga-Ural Basin

Liang

Jin

Philippov

et al. 2020

Marine and Petroleum Geology

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Geochemistry of Late Devonian oils of the Timan–Pechora basin

Cited by 17 publications

References 22 publications

Alterations of Carbonate Mineral Matrix and Kerogen Micro-Structure in Domanik Organic-Rich Shale during Anhydrous Pyrolysis

Alterations of Carbonate Mineral Matrix and Kerogen Micro-Structure in Domanik Organic-Rich Shale during Anhydrous Pyrolysis

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Sedimentary characteristics and evolution of Domanik facies from the Devonian–Carboniferous regression in the southern Volga-Ural Basin

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