Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effects of CO2-brine-rock Fracture Interaction on Reactive Solute Transport Properties During CO2 Sequestration in Deep Saline Aquifers
https://orcid.org/http://orcid.org/0000-0001-6212-3995
The deep saline aquifer has a storage potential of CO2 over 60%, making it one of the most recognized storage method. The complex reactive solute transport between saline water, CO2 and surrounding rock minerals directly affects the CO2 sequestration in deep saline aquifers and long-term environmental safety. Reactive solute transport experiment on a sandstone fracture was conducted to determine the main mineral reactions. The governing equations for the evolution of fracture aperture considering chemical reaction processes were given, while coupled with advection–diffusion equation and Navier–Stokes equation to calculate the fracture aperture, specie concentration and fluid pressure, respectively. The species concentration distribution, fluid flow and fracture aperture evolution characteristics at short and long cycles were obtained under four combinations of Pe number and Da number, considering the dynamic variation of the grid and cyclic seepage boundary under chemical reaction. The experimental results indicated that the primary mineral reaction in the rock fracture was CaAl2Si2O8 + CO2 + 2H2O = > Ca2+ + CO32-+Al2Si2O5(OH)4. The results of the dimensionless parameter analysis revealed that the Pe number was the governing factor of the solute transport process in the short cycle, and the time to reach the peak solute concentration decreased with increasing Pe number. Under the long cycle, the solute transport process was governed by the Da number. The reaction rate is relatively faster under high Da number conditions during the early stage, as are the product concentration variation rate and fracture aperture variation rate. The fracture closed under a high Da number, resulting in a progressive decrease in the variation rate of Ca2+ concentration during the late stage. Additionally, the bypassing flow phenomenon of streamlines and species transport pathways was also observed. The research results can provide a foundation for the long-term potential assessment, transport pathways prediction, and safety evaluation of CO2 sequestration in saline aquifers.
The rock fracture reactive solute transport experiment was conducted based on the self-developed experimental device, and the main mineral reaction were obtained.
The governing equation for the evolution of fracture aperture under chemical action was proposed, and the coupled analysis method for reactive solute transport was developed.
The reactive mineral boundary was identified by using digital image processing technique, and the numerical model was established by interfacing with COMSOL.
The reactive solute transport properties at short and long cycle were analyzed under various combinations of Pe number and Da number.
Effects of CO2-brine-rock Fracture Interaction on Reactive Solute Transport Properties During CO2 Sequestration in Deep Saline Aquifers
https://orcid.org/http://orcid.org/0000-0001-6212-3995
The deep saline aquifer has a storage potential of CO2 over 60%, making it one of the most recognized storage method. The complex reactive solute transport between saline water, CO2 and surrounding rock minerals directly affects the CO2 sequestration in deep saline aquifers and long-term environmental safety. Reactive solute transport experiment on a sandstone fracture was conducted to determine the main mineral reactions. The governing equations for the evolution of fracture aperture considering chemical reaction processes were given, while coupled with advection–diffusion equation and Navier–Stokes equation to calculate the fracture aperture, specie concentration and fluid pressure, respectively. The species concentration distribution, fluid flow and fracture aperture evolution characteristics at short and long cycles were obtained under four combinations of Pe number and Da number, considering the dynamic variation of the grid and cyclic seepage boundary under chemical reaction. The experimental results indicated that the primary mineral reaction in the rock fracture was CaAl2Si2O8 + CO2 + 2H2O = > Ca2+ + CO32-+Al2Si2O5(OH)4. The results of the dimensionless parameter analysis revealed that the Pe number was the governing factor of the solute transport process in the short cycle, and the time to reach the peak solute concentration decreased with increasing Pe number. Under the long cycle, the solute transport process was governed by the Da number. The reaction rate is relatively faster under high Da number conditions during the early stage, as are the product concentration variation rate and fracture aperture variation rate. The fracture closed under a high Da number, resulting in a progressive decrease in the variation rate of Ca2+ concentration during the late stage. Additionally, the bypassing flow phenomenon of streamlines and species transport pathways was also observed. The research results can provide a foundation for the long-term potential assessment, transport pathways prediction, and safety evaluation of CO2 sequestration in saline aquifers.
The rock fracture reactive solute transport experiment was conducted based on the self-developed experimental device, and the main mineral reaction were obtained.
The governing equation for the evolution of fracture aperture under chemical action was proposed, and the coupled analysis method for reactive solute transport was developed.
The reactive mineral boundary was identified by using digital image processing technique, and the numerical model was established by interfacing with COMSOL.
The reactive solute transport properties at short and long cycle were analyzed under various combinations of Pe number and Da number.
Effects of CO2-brine-rock Fracture Interaction on Reactive Solute Transport Properties During CO2 Sequestration in Deep Saline Aquifers
https://orcid.org/http://orcid.org/0000-0001-6212-3995
The deep saline aquifer has a storage potential of CO2 over 60%, making it one of the most recognized storage method. The complex reactive solute transport between saline water, CO2 and surrounding rock minerals directly affects the CO2 sequestration in deep saline aquifers and long-term environmental safety. Reactive solute transport experiment on a sandstone fracture was conducted to determine the main mineral reactions. The governing equations for the evolution of fracture aperture considering chemical reaction processes were given, while coupled with advection–diffusion equation and Navier–Stokes equation to calculate the fracture aperture, specie concentration and fluid pressure, respectively. The species concentration distribution, fluid flow and fracture aperture evolution characteristics at short and long cycles were obtained under four combinations of Pe number and Da number, considering the dynamic variation of the grid and cyclic seepage boundary under chemical reaction. The experimental results indicated that the primary mineral reaction in the rock fracture was CaAl2Si2O8 + CO2 + 2H2O = > Ca2+ + CO32-+Al2Si2O5(OH)4. The results of the dimensionless parameter analysis revealed that the Pe number was the governing factor of the solute transport process in the short cycle, and the time to reach the peak solute concentration decreased with increasing Pe number. Under the long cycle, the solute transport process was governed by the Da number. The reaction rate is relatively faster under high Da number conditions during the early stage, as are the product concentration variation rate and fracture aperture variation rate. The fracture closed under a high Da number, resulting in a progressive decrease in the variation rate of Ca2+ concentration during the late stage. Additionally, the bypassing flow phenomenon of streamlines and species transport pathways was also observed. The research results can provide a foundation for the long-term potential assessment, transport pathways prediction, and safety evaluation of CO2 sequestration in saline aquifers.
The rock fracture reactive solute transport experiment was conducted based on the self-developed experimental device, and the main mineral reaction were obtained.
The governing equation for the evolution of fracture aperture under chemical action was proposed, and the coupled analysis method for reactive solute transport was developed.
The reactive mineral boundary was identified by using digital image processing technique, and the numerical model was established by interfacing with COMSOL.
The reactive solute transport properties at short and long cycle were analyzed under various combinations of Pe number and Da number.
Effects of CO2-brine-rock Fracture Interaction on Reactive Solute Transport Properties During CO2 Sequestration in Deep Saline Aquifers
Rock Mech Rock Eng
Qiao, Liping (Autor:in) / Ren, Mengzi (Autor:in) / Li, Bingyin (Autor:in) / Wang, Zhechao (Autor:in)
Rock Mechanics and Rock Engineering ; 58 ; 1757-1775
01.02.2025
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Reactive solute transport in an asymmetrical fracture–rock matrix system
| British Library Online Contents | 2018
Reactive solute transport in an asymmetrical fracture–rock matrix system
| British Library Online Contents | 2018
A review of microfluidic technology for CO2 sequestration in saline aquifers
| Elsevier | 2025