Mahdi Mansouri Boroujeni (ISTO) donnera un séminaire intitulé : A novel microfluidic device for studying reactive transport and the effect of SO2 impurities on carbon storage.
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Résumé
Geological carbon capture and storage (CCS) is a part of the long-term plan to reduce atmospheric CO2 to limit global warming. In this process, CO2 is captured from the power plant atmosphere, purified, transported to injection sites, and sequestrated in underground reservoirs, e.g., depleted petroleum reservoirs, saline aquifers, and deep un-mineable coal seams. Among these, deep saline aquifers have the largest storage capacity.
Various trapping mechanisms are induced during CO2 sequestration: Physical mechanisms, including structural trapping and capillary trapping, and geochemical mechanisms, including CO2 dissolution and mineral trapping. By CO2 dissolution, the prevailing thermodynamic equilibrium is upset, and a chain of reactions is triggered, seeking a new equilibrium state. These reactions are able to dissolve the solid phase (minerals and cementations) and produce secondary mineral phases, leading to porous media petrophysical and physicochemical properties alterations. So far, the definition of pore-scale parameters describing the induced geochemical mechanisms is lacking for understanding mineral trapping.
Micromodels are 2D replicas of underground porous media. The ability to precisely control the porous media structure, composition, and flow condition, combined with various monitoring systems (such as optical microscopy, Raman spectroscopy, etc.), is what makes microfluidics a spectacular method for perceiving pore-scale information in reactive systems.
In this study, we present a novel silicon-glass microfluidic system modified by growing calcite nanocrystals on walls, mimicking carbonate formations. With this setting, we aim to bring new light to induced mechanisms during reactive transports by investigating the pore-scale effects of SO2 impurities. The preliminary PHREEQC simulation results of the described system are presented to highlight geochemical mechanisms induced by species transport and reaction kinetics.