Perspectives for Oil and Gas Paleozoic Bearing Strata on the Junction Area of the Pre-Caspian and Volga-Ural Petroleum Provinces

Ershov, S.V.; Kanev, Aleksandr; Ermolova, T.E.; Bushueva, M.A.; Mikheeva, A.I.; Stupak, A.A.; Belousov, Grigorii; Gorodkov, Aleksei; Petersil'e, V.I.; Shvets-Teneta-Guriy, A.G.; Kholmyanskaya, Nataliya; Volodina, A.G.

doi:10.17353/2070-5379/42_2022

Cited by 1 publication

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“…The designation of three predominant types of environments in the Middle-Late Devonian basin of the central part of the Volga-Urals Province: (1) condensed and non-condensed depressions, (2) slopes of depressions, and (3) shallow waters of tectonic arches (Aliev et al, 1978;Mkrtchyan, 1980) is supported by most contemporary researchers (Gatovsky et al, 2015;Fortunatova et al, 2016Fortunatova et al, , 2018Liang et al 2015Liang et al , 2020Stupakova et al, 2015Stupakova et al, , 2017Kabanov and Jiang, 2020;Kabanov et al, 2023a, b).…”

Section: Discussionmentioning

confidence: 95%

“…The encountered fauna comprises sponge spicules, tentaculitids, lingulids, Buchiola bivalves, and algal fragments. Additionally, the rocks feature sapropelite interlayers with an organic carbon content of up to 30% (Fortunatova et al, 2018).…”

Section: Geological Settingsmentioning

confidence: 99%

“…Therefore, all correlations involving clastic intervals of the succession are approximate. Fortunatova et al (2016Fortunatova et al ( , 2018 considered the Upper Devonian sequences of the Volga-Urals Petroleum Province and provided a regional conodont zonation for the Fransian and Famennian according to Ovnatanova and Kononova (2008), comparing it with the standard conodont zonation according to Gradstein (2004). We have used this comparison in this paper, extending the zonation to the Middle Devonian and adding a modern chronostratigraphic framework (Becker et al, 2020), which enables to estimate the duration of conodont zones and regional stages.…”

Section: Accumulation Of Sediments In Different Environmentsmentioning

confidence: 99%

“…Recent studies have concentrated on examining the sedimentological and facies characteristics of Devonian sediments to develop detailed sedimentary models. These models have been developed separately for clastic sediments (Fortunatova et al, 2013;Loscheva et al, 2017;Silantiev et al, 2022), carbonate sediments (Fortunatova et al, 2016;Yousef et al, 2023), and black shales (Stupakova et al, 2015(Stupakova et al, , 2017Liang et al, 2020). In most cases, the authors examine only a certain stratigraphic interval of interest, not always using new stratigraphic schemes and data.…”

Section: Introductionmentioning

confidence: 99%

“…We further analysed three predominant types of sedimentation observed in various settings of study area during the Devonian period (Aliev et al, 1978;Gubareva, 2003;Fortunatova et al, 2018):…”

Section: Introductionmentioning

confidence: 99%

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From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province

Silantiev,

Miftakhutdinova,

Nurgalieva

2024

Preprint

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Analyses of the three predominant types of sedimentation – clastic, carbonate and black shale – revealed their discontinuity/continuity in different facies environments of the Middle and Late Devonian of the central part of the Volga-Urals petroleum province, namely (1) in depressions, both condensed and non-condensed, (2) on the slopes of depressions and (3) in shallow water environments represented by tectonic arches or localised biohermal uplifts. The regional zonation of conodonts, correlated with the global chronostratigraphic scheme, substantiates the stratigraphic completeness of the general Devonian sequence in this area. In particular, the sedimentation of organic-rich black shales, traditionally considered as source rocks, lasted more than 29 million years, starting from the Late Eifel and ending at the Devonian-Carboniferous boundary. There was only one hiatus in the deposition of both black shales and carbonate sediments, lasting about 2.5 million years at the end of the Frasnian. That interval is dominated by clastic sediments, which are considered to be the most productive reservoirs of the Volga-Ural province. In the time interval from the beginning of the Eifel to the end of the Frasnian (about 17 Ma), (a) clastic sediments show the highest accumulation rates; (b) the most complete sequences occur in depressions; and (c) arches and uplifts show the most significant gaps in the geological record. During Famennian, (a) clastic sedimentation has completely ceased; (b) differences between the slopes of troughs and shallow-water environments have diminished, resulting in stable accumulation of carbonate sediments in both settings; (c) the decrease in sequence thickness (up to 50 m) in depressions suggests reduced accumulation rates of deep-water organic-rich black shales. The results help to understand the complex spatial relationship between different coexisting sedimentation types and focus attention to the incompleteness of the geological record in different environments.

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Section: Discussionmentioning

confidence: 95%

Section: Geological Settingsmentioning

confidence: 99%

Section: Accumulation Of Sediments In Different Environmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province

Silantiev,

Miftakhutdinova,

Nurgalieva

2024

Preprint

View full text Add to dashboard Cite

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Perspectives for Oil and Gas Paleozoic Bearing Strata on the Junction Area of the Pre-Caspian and Volga-Ural Petroleum Provinces

Cited by 1 publication

References 0 publications

From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province

From Clastics to Carbonates and Black Shales: Deciphering Sedimentary Continuity and Discontinuity in the Devonian Landscape of the Volga-Ural Petroleum Province

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