Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure
Diagenetic albitization has been observed in sedimentary basins around the world. This process significantly changes the original composition of sandstones and the chemistry of the formation waters under the influence of partial pressure of CO2. The transformation of detrital feldspars into albite i...
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2024-01-01
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| author | Marcos Antonio Klunk Tiago Jonatan Girelli Soyane Juceli Siqueira Xavier Farid Chemale, Jr Renzo D'souza Mohuli Das Sudipta Dasgupta |
| author_facet | Marcos Antonio Klunk Tiago Jonatan Girelli Soyane Juceli Siqueira Xavier Farid Chemale, Jr Renzo D'souza Mohuli Das Sudipta Dasgupta |
| author_sort | Marcos Antonio Klunk |
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| description | Diagenetic albitization has been observed in sedimentary basins around the world. This process significantly changes the original composition of sandstones and the chemistry of the formation waters under the influence of partial pressure of CO2. The transformation of detrital feldspars into albite is considered a crucial diagenetic process in the Gulf Coast and North Sea reservoirs. Earlier studies suggest that plagioclase albitization typically happens before that of K-feldspar. In the Gulf Coast's Frio Sandstone, located in the Upper Oligocene at depths between 900 and 2400 m, detrital plagioclase is often dissolved and replaced by albite, while K-feldspar mostly dissolves without much substitution. Similarly, in the North Sea reservoirs, especially in the upper section of the Upper Triassic Lunde Formation at depths beyond 2900 m, plagioclase tends to undergo albitization, whereas K-feldspar remains largely unaffected or experiences minimal transformation. This research focuses on analyzing the differences in the albitization patterns of detrital and K-feldspar plagioclase through the KINDISP and Geochemist's Workbench (GWB) geochemical modeling tools, aiming to compare them. These diagenetic processes are crucial for reservoir geology, as they influence the concentration of silica in water, which, in turn, affects quartz cementation. This study aims to explore the variations in the albitization behavior of detrital and K-feldspar plagioclase using the KINDISP and Geochemist's Workbench (GWB) geochemical models and conduct a comparative analysis between them. Understanding these diagenetic reactions becomes relevant for reservoir geology analysis, as such phenomena control the aqueous silica concentration to some extent, which is consequently reflected in the quartz cementation. The dissolution of plagioclase and K-feldspar releases silica into the pore fluids. As the concentration of silica in the fluid increases, it leads to the precipitation of quartz as overgrowths on detrital quartz grains, a process known as quartz cementation. This was observed particularly in simulations involving temperature increases up to 150 °C, where the equilibrium between albite and anorthite was closely linked to the stability of quartz (Ben et al., 1993). The removal of feldspar through albitization reduces porosity and permeability but contributes silica to the system, which promotes quartz cementation. This, in turn, decreases the reservoir quality by filling pore spaces with secondary quartz, reducing the rock's ability to store and transmit fluids. Thus, the study highlights the importance of these diagenetic processes in reservoir evaluation, as the balance between feldspar dissolution and quartz cementation ultimately controls reservoir properties. |
| format | Article |
| id | doaj-art-25be699aebf844b7a4900a3c35e2c07d |
| institution | DOAJ |
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| spelling | doaj-art-25be699aebf844b7a4900a3c35e2c07d2025-08-20T02:50:20ZengElsevierEvolving Earth2950-11722024-01-01210004210.1016/j.eve.2024.100042Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressureMarcos Antonio Klunk0Tiago Jonatan Girelli1Soyane Juceli Siqueira Xavier2Farid Chemale, Jr3Renzo D'souza4Mohuli Das5Sudipta Dasgupta6Department of Geology, University of Vale do Rio dos Sinos, Av. Unisinos 950, São Leopoldo, RS, BrazilDepartment of Geology, University of Vale do Rio dos Sinos, Av. Unisinos 950, São Leopoldo, RS, BrazilDepartment of Geology, University of Vale do Rio dos Sinos, Av. Unisinos 950, São Leopoldo, RS, BrazilDepartment of Geology, University of Vale do Rio dos Sinos, Av. Unisinos 950, São Leopoldo, RS, BrazilIndian Institute of Technology Bombay (IIT Bombay), Powai, Mumbai, 400076, India; Corresponding author.Indian Institute of Technology Bombay (IIT Bombay), Powai, Mumbai, 400076, IndiaIndian Institute of Technology Bombay (IIT Bombay), Powai, Mumbai, 400076, IndiaDiagenetic albitization has been observed in sedimentary basins around the world. This process significantly changes the original composition of sandstones and the chemistry of the formation waters under the influence of partial pressure of CO2. The transformation of detrital feldspars into albite is considered a crucial diagenetic process in the Gulf Coast and North Sea reservoirs. Earlier studies suggest that plagioclase albitization typically happens before that of K-feldspar. In the Gulf Coast's Frio Sandstone, located in the Upper Oligocene at depths between 900 and 2400 m, detrital plagioclase is often dissolved and replaced by albite, while K-feldspar mostly dissolves without much substitution. Similarly, in the North Sea reservoirs, especially in the upper section of the Upper Triassic Lunde Formation at depths beyond 2900 m, plagioclase tends to undergo albitization, whereas K-feldspar remains largely unaffected or experiences minimal transformation. This research focuses on analyzing the differences in the albitization patterns of detrital and K-feldspar plagioclase through the KINDISP and Geochemist's Workbench (GWB) geochemical modeling tools, aiming to compare them. These diagenetic processes are crucial for reservoir geology, as they influence the concentration of silica in water, which, in turn, affects quartz cementation. This study aims to explore the variations in the albitization behavior of detrital and K-feldspar plagioclase using the KINDISP and Geochemist's Workbench (GWB) geochemical models and conduct a comparative analysis between them. Understanding these diagenetic reactions becomes relevant for reservoir geology analysis, as such phenomena control the aqueous silica concentration to some extent, which is consequently reflected in the quartz cementation. The dissolution of plagioclase and K-feldspar releases silica into the pore fluids. As the concentration of silica in the fluid increases, it leads to the precipitation of quartz as overgrowths on detrital quartz grains, a process known as quartz cementation. This was observed particularly in simulations involving temperature increases up to 150 °C, where the equilibrium between albite and anorthite was closely linked to the stability of quartz (Ben et al., 1993). The removal of feldspar through albitization reduces porosity and permeability but contributes silica to the system, which promotes quartz cementation. This, in turn, decreases the reservoir quality by filling pore spaces with secondary quartz, reducing the rock's ability to store and transmit fluids. Thus, the study highlights the importance of these diagenetic processes in reservoir evaluation, as the balance between feldspar dissolution and quartz cementation ultimately controls reservoir properties.http://www.sciencedirect.com/science/article/pii/S2950117224000128DiagenesisAlbitizationGeochemical modelingTurbidite sandstones |
| spellingShingle | Marcos Antonio Klunk Tiago Jonatan Girelli Soyane Juceli Siqueira Xavier Farid Chemale, Jr Renzo D'souza Mohuli Das Sudipta Dasgupta Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure Evolving Earth Diagenesis Albitization Geochemical modeling Turbidite sandstones |
| title | Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure |
| title_full | Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure |
| title_fullStr | Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure |
| title_full_unstemmed | Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure |
| title_short | Geochemical modeling of diagenetic reactions between albitization of K-feldspar and plagioclase feldspar in sandstone reservoirs under the influence of CO2 partial pressure |
| title_sort | geochemical modeling of diagenetic reactions between albitization of k feldspar and plagioclase feldspar in sandstone reservoirs under the influence of co2 partial pressure |
| topic | Diagenesis Albitization Geochemical modeling Turbidite sandstones |
| url | http://www.sciencedirect.com/science/article/pii/S2950117224000128 |
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