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Impact of microfacies and diagenesis on the reservoir quality of Upper Devonian carbonates in Southeast Tatarstan,Volga-Ural Basin,Russia

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Petroleum Research 2023年第3期8卷 386-403页

作者： Ibrahem Yousef V.P.Morozov a.n.kolchugin A.Leontev Kazan Federal University Institute of Geology and Petroleum Technologies420008Russia

The results of integrated sedimentology,petrography,and petrophysical study of the Upper Devonian(Middle Famennian)Dankovo-Lebedyansky carbonates from Southeast Tatarstan of the Volga-Ural Basin revealed a variety of microfacies and diagenetic events that impacted the reservoir quality.Although our earlier study documented microfacies analysis and depositional environments,none of the studies focused on diagenesis,microfacies interaction,and their controls on the studied sediment's reservoir quality.Based on petrographic and microfacies analyses,the seven identified microfacies types are peloidal grainstone MF 1,cemented bioclastic peloidal grainstone MF 2,echinoderm-concentrated packstone MF 3,algae packstone MF 4,bioclastic wackestone MF 5,whole-fossil wackestone MF 6,and dolomite MF 7.For the investigated sediments,a gently deepening carbonate ramp depositional model with an inner,middle,and outer ramp setting is proposed.The observed diagenetic events in this study include micritization,calcite cementation(six cement types),dolomitization(six dolomite types),dissolution(fabric and non-fabric-selective dissolution),compaction,and microfracturing.The identified microfacies were classified into three distinct classes based on their petrophysical characteristics.MF 1 and MF 7 are microfacies types with the best reservoir quality.MF 3 and MF 4 are microfacies types of moderate reservoir quality.MF 2,MF 5,and MF 6 are microfacies types with poor or non-reservoir quality.Calcite cementation,micritization,and compaction are the primary diagenetic modifications responsible for porosity reduction.Moldic pores created by dissolution are a significant porosityimproving process.Porosity is locally enhanced by stylolite and microfractures.Dolomitization improved reservoir quality by creating intercrystalline and vuggy porosity.Understanding the impact of microfacies and diagenesis on reservoir quality is crucial for understanding reservoir properties in nearby fields with similar settings.

关键词： Microfacies Diagenesis Reservoir quality Upper Devonian Dankovo-Lebedyansky Tatarstan Volga-Ural Basin

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Sedimentary diagenesis and pore characteristics for the reservoir evaluation of Domanik formations(Semiluksk and Mendymsk)in the central part of Volga-Ural petroleum province

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Petroleum Research 2022年第1期7卷 32-46页

作者： Yousef Ibrahem V.P.Morozov V.Sudakov I.Idrisov a.n.kolchugin Kazan Federal University Institute of Geology and Petroleum Technologies420008Russian Federation

The Upper Devonian Semiluksk(Domanik)and Mendymsk carbonate successions have been identified as the most promising unconventional oil and gas deposits in Russia's Volga-Ural petroleum province.Three lithofacies were identified:limestones,organic matter-rich siliceous carbonate,and dolomitic limestones/dolomite.Their sediments are thought to have accumulated in the relatively deep-sea shelf depositional environment.According to X-ray analysis,calcite is the most common mineral phase in the limestones.The siliceous carbonate rocks'major mineral phases were identified to be quartz,followed by calcite.The rocks have relatively poor reservoir qualities,with porosity ranging from 0.1 to 5%and permeability ranging from 0.01 to 10 mD.Petrographic examination of thin sections reveals four major types of pores:1.interparticle pores,which are abundant in all of the examined lithofacies;2.intercrystalline pores formed between dolomite crystals and the very fine components of the siliceous carbonate rocks.***.vugs as a result of leaching,and 4.fracture as a result of tectonic and/or diagenetic events.Plotting the obtained data from the petrographically examined thin sections on the ternary pore plot diagram resulted in the identification of six pore facies and their related diagenetic patterns.Pore facies 1 depicts the pores that formed during the depositional process.Pore facies 4 displays moldic pores.The vugs are represented by pore facies 6.Pore facies 2 is a mixture between pore facies 1 and pore facies 4.Pore facies 3 is a mixture between pore facies 1 and pore facies 6.Pore facies 5 is a mixture between pore facies 4 and pore facies 6.Comparing the petrographic results and the identified pore facies show that pore facies 6 have touching pores and they played the most important role in improving the reservoir quality.The pore facies 4 which have separate pores have the most influence in the reduction of the reservoir quality.The diagenetic origin secondary pores are the most pores identified in the studied carbonate secti

关键词： Domanik formations Shale oil Lithofacies Diagenesis Reservoir characteristics Central part of volga-ural

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Comparison of source rocks from the Lower Silurian Longmaxi Formation in the Yangzi Platform and the Upper Devonian Semiluksk Formation in East European Platform

能源地球科学(英文)

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能源地球科学(英文) 2021年第1期2卷 63-72页

作者： V.P.Morozov Zhijun Jin Xinping Liang E.A.Korolev Quanyou Liu a.n.kolchugin A.A.Eskin A.V.nizamova B.V.Assumption Guangxiang Liu Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazan420008Russia Institute of Energy Peking UniversityBeijing100871China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing100083China Sinopec Petroleum Exploration and Production Research Institute Beijing100083China

Due to the depletion of conventional hydrocarbon resources,both China and Russia are giving more attention to the exploration and production of unconventional oil and gas resources,especially those generated and accumulated within source rocks.In an attempt to further understand the mechanisms of these resources,detailed mineralogical,lithological,and geochemical studies were performed to compare source rock samples from i)the Longmaxi Formation of the Lower Silurian in the Sichuan Basin(China),and ii)the Semiluksk Formation of the Frasnian Stage of the Upper Devonian in the Volga-Ural region of the East European Platform(Russia).The results showed that the main mineral of the source rocks of both formations is chalcedony that formed during an outpouring of deep fluids onto the sea bed.Simultaneous thermal analyses of this mineral indicated similar thermophysical properties to those of the hydrothermal-sedimentary chalcedony from jasper.Moreover,a direct relationship between the chalcedony content and the total organic matter content in the samples from the two formations was established.The presence of biophilic chemical elements in the siliceous component of the source rock samples indicate that high total organic content values were likely due to the presence of biophilic chemical elements in deep fluids,which led to the large-scale development of biota and subsequent accumulation of organic matter during sedimentation.The findings also revealed that the organic matter in the source rocks of the two regions was at different stages of maturity.The organic matter in samples from the Volga-Ural region was less mature and only at the early stage of oil generation,whereas the organic matter in samples from the Sichuan Basin reached both oil and gas generation stages.The Longmaxi Formation is already in the shale gas exploration and development stage,and the Semiluksk Formation could also be regarded as an exploration target for shale oil reservoirs.

关键词： Source rock comparison Longmaxi Formation Semiluksk Formation Sichuan Basin East European Platform

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Microfacies analysis and depositional environment of the Upper Devonian Dankovo-Lebedyansky sediments,Tatarstan,Volga-Ural Basin,Russia

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Petroleum Research 2023年第2期8卷 244-255页

作者： Ibrahem Yousef V.P Morozov a.n.kolchugin V.Sudakov I.Idrisov A.Leontev Kazan Federal University Institute of Geology and Petroleum Technologies420008Russian Federation

The Upper Devonian,Middle Famennian Dankovo-Lebedyansky sediments in Southeast Tatarstan territory are a carbonate sequence composed of limestone and dolomite,which is important hydrocarbon reservoir units,therefore,it is necessary to conduct in-depth study on its microfacies and depositional environment.In this study,a multidisciplinary approach that combines core observation with thin section examination is used.The limestone contains abundant skeletal grains(echinoderms,foraminifera,algae,gastropods,and calcispheres),as well as non-skeletal grains(intraclasts and peloids).On the basis of detailed petrographic investigations,six sedimentary microfacies can be identified,including(i)peloidal grainstone(MF 1),(ii)cemented bioclastic peloidal grainstone(MF 2),(iii)echinodermconcentrated packstone(MF 3),(iv)algae packstone(MF 4),(v)bioclastic wackestone(MF 5),(vi)whole-fossil wackestone(MF 6),as well as dolomite or dolostone as diagenetic facies(MF 7).Based on microfacies analysis,the Dankovo-Lebedyansky sediments were deposited in three distinct sedimentary facies belts(shoal,lagoon and open marine environment).In order to reflect dispositional energy condition,the microfacies were grouped into facies associations:(i)low-energy microfacies associations including MF 5 and MF 6,(ii)moderate energy microfacies associations including MF 1,MF 2,MF 3,and MF 4.The dolomite,or diagenetic facies(MF 7),is the result of slightly to extensively dolomitization of limestone in the Dankovo-Lebedyansky sediments.Most of frequent dolostone types are euhedral planar-e and subhedral planar-s.According to petrographic characteristic of the dolostone,a seepage reflux model can be used to explain the dolomitization process of Dankovo-Lebedyansky sediments.

关键词： Microfacies Depositional environments Carbonate Dolomitization Upper devonian Dankovo-lebedyansky Volga-ural basin

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