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

Yousef, Ibrahem; Морозов, В. П.; Kolchugin, A. N.; Leontev, A.

doi:10.1016/j.ptlrs.2022.10.006

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…Currently, the most significant oil and gas reservoirs are the deep carbonate ones (Yousef et al, 2023). It is crucial to comprehend the diagenetic evolution to enhance exploration and development of oil and gas.…”

Section: Literature Reviewmentioning

confidence: 99%

Meteoric water effect of diagenesis processes in deep carbonate reservoirs

Wang,

Zhang,

Wang

et al. 2024

Front. Earth Sci.

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As the world’s main oil and gas resource, the deep carbonate reservoir has great exploration-development potential. However, it is difficult to make development and exploration due to its complex diagenesis processes. During the formation of carbonate reservoirs, the effect of meteoric water forms karst holes for oil and gas reservoirs, but the complex internal mechanism severely restricts the exploration and development of carbonate reservoirs. This paper takes the deep carbonate reservoirs in the Tarim Basin as the research object, studies the diagenesis processes in deep carbonate reservoirs through geological survey, analyzes the effect of meteoric water on porosity and mineral changes in carbonate reservoirs at different diagenetic stages by using laboratory test, theoretical analysis, and numerical simulation research methods. The numerical simulation method is used to simulate the porosity changes and mineral evolution of reservoirs in different diagenetic stages, and the conclusion is drawn that meteoric water has an impact on reservoir minerals and porosity. The results show that the carbonate reservoirs in the Tarim Basin have high porosity and good permeability, and the reservoirs have experienced deposition, compaction, dissolution, and hydrothermal stages, and have experienced meteoric water effects for a long time, resulting in rock dissolution, regenerative precipitation and chemical reaction; Quartz and feldspar minerals are the most in the sample through laboratory tests, the content of quartz decreased first, then increased and decreased, and the content of chlorite and mica changed little during the whole diagenesis processes. With the injection of organic acid, the porosity of the reservoir increases, with the continuous increase of temperature and pressure, the porosity decreases. After the second injection of organic acid, the porosity increases continuously, and finally, the porosity decreases. TOUGHREACT is used to simulate the static reaction of water and rock, simulating six diagenetic stages. With the injection of organic acid, the porosity increases continuously and then reaches equilibrium. The sudden increase in temperature and pressure leads to an increase in porosity, and the porosity of the reservoir changes little during the second injection of organic acid, and the porosity decreases in the final stage. The research results provide theoretical data support for guiding oil and gas exploration in deep carbonate reservoirs.

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Section: Literature Reviewmentioning

confidence: 99%

Meteoric water effect of diagenesis processes in deep carbonate reservoirs

Wang,

Zhang,

Wang

et al. 2024

Front. Earth Sci.

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“…The P-impedance slice extracted for the Sakesar horizon with 20 ms averaging window is shown in Figure 12. The Pimpedance value of the Sakesar ranges between 11434 and 13069 (m/s*g/cm 3 ). The slice of Sakesar represents a lowimpedance zone in the southern part of the study area near the Balkassar OXY 01 and Balkassar 07 wells.…”

Section: Geohistory Analysismentioning

confidence: 99%

“…The reservoir quality of carbonate rocks is greatly dependent on the compaction process during sediment burial, in addition to other processes such as cementation, dissolution, diagenesis, and depositional microfacies. − Porosity reduction with an increase in burial depth of the sedimentary rocks is primarily governed by either mechanical or chemical compaction. , As the overburden pressure is increased, the chemical and physical properties of sedimentary rocks begin to change . Apart from the porosity reduction, the development of pore spaces with time and depth directly impacts subsidence rates.…”

Section: Introductionmentioning

confidence: 99%

Carbonate Reservoir Quality Variations in Basins with a Variable Sediment Influx: A Case Study from the Balkassar Oil Field, Potwar, Pakistan

Amjad

Ehsan

Hussain³

et al. 2023

ACS Omega

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The carbonate reservoir quality is strongly reliant on the compaction process during sediment burial and other processes such as cementation and dissolution. Porosity and pore pressure are the two main factors directly affected by mechanical and chemical compactions. Porosity reduction in these carbonates is critically dependent on the overburden stress and subsidence rate. A variable sediment influx in younger basins may lead to changes in the reservoir quality in response to increasing lithostatic pressure. Deposition of molasse sediments as a result of the Himalayan orogeny caused variations in the sedimentation influx in the Potwar Basin of Pakistan throughout the Neogene times. The basic idea of this study is to analyze the carbonate reservoir quality variations induced by the compaction and variable sediment influx. The Sakesar Limestone of the Eocene age, one of the proven carbonate reservoirs in the Potwar Basin, shows significant changes in the reservoir quality, specifically in terms of porosity and pressure. A 3D seismic cube (10 km2) and three wells of the Balkassar field are used for this analysis. To determine the vertical and lateral changes of porosity in the Balkassar area, porosity is computed from both the log and seismic data. The results of both the data sets indicate 2–4% porosities in the Sakesar Limestone. The porosity reduction rate with respect to the lithostatic pressure computed with the help of geohistory analysis represents a sharp decrease in porosity values during the Miocene times. Pore pressure predictions in the Balkassar OXY 01 well indicate underpressure conditions in the Sakesar Limestone. The Eocene limestones deposited before the collision of the Indian plate had enough time for fluid expulsion and show underpressure conditions with high porosities.

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“…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%

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

Cited by 6 publications

References 24 publications

Meteoric water effect of diagenesis processes in deep carbonate reservoirs

Meteoric water effect of diagenesis processes in deep carbonate reservoirs

Carbonate Reservoir Quality Variations in Basins with a Variable Sediment Influx: A Case Study from the Balkassar Oil Field, Potwar, Pakistan

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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