Título:
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Interaction between a fractured marl caprock and CO2-rich sulfate solution under supercritical CO2 conditions
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Autor/a:
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Dávila Ordóñez, Maria Gabriela; Luquot, Linda; Soler Matamala, Josep M.; Cama Robert, Jordi
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Otros autores:
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Universitat Politècnica de Catalunya. GHS - Grup d'Hidrologia Subterrània |
Abstract:
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Geological CO2 sequestration at pilot-plant scale will be developed at Hontomin (Spain). CO2 will be injected into a limestone reservoir that contains a NaCl- and sulfate-rich groundwater in equilibrium with calcite and gypsum. The caprock site is composed of marl. The present study seeks to evaluate the interaction between the Hontomin marl and CO2-rich sulfate solutions under supercritical CO2 conditions (P-Total = 150 bar, pCO(2) = 61 bar and T = 60 degrees C).; Flow-through percolation experiments were performed using artificially fractured cores to elucidate (i) the role of the composition of the injected solutions (S-free and S-rich solutions) and (ii) the effect of the flow rate (0.2, 1 and 60 mLh(-1)) on fracture permeability. Major dissolution of calcite (S-free and S-rich solutions) and precipitation of gypsum (S-rich solution) together with minor dissolution of the silicate minerals contributed to the formation of an altered skeleton-like zone (mainly made up of unreacted clays) along the fracture walls. Dissolution patterns changed from face dissolution to wormhole formation and uniform dissolution with increasing Peclet numbers.; In S-free experiments, fracture permeability did not significantly change regardless of the flow rate despite the fact that a large amount of calcite dissolved. In S-rich solution experiments, fracture permeability decreased under slow flow rates (0.2 and 1 mLh(-1)) because of gypsum precipitation that sealed the fracture. At the highest flow rate (60 mLh(-1)), fracture permeability increased because calcite dissolution predominated over gypsum precipitation. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria química::Química del medi ambient::Química atmosfèrica -Geological carbon sequestration -CO2 sequestration -Caprock -Fracture permeability -Calcite -Gypsum -Sealing -FLUID-ROCK INTERACTION -DISSOLUTION KINETICS -CARBON-DIOXIDE -RESERVOIR CONDITIONS -COUPLED DISSOLUTION -SEDIMENTARY BASINS -AQUEOUS-SOLUTIONS -SALINE AQUIFERS -PORE-SCALE -STORAGE -Anhídrid carbònic -- Segrest |
Derechos:
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Tipo de documento:
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Artículo - Versión presentada Artículo |
Editor:
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John Gale
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Compartir:
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