Experimental study and geochemical model as a tool to evaluate the geological storage of CO2 in the Ebro Basin, Spain
DOI:
https://doi.org/10.55407/geogaceta113334Keywords:
CO2 geological storage, reservoir, PHQREEQC code, Spain, experimentationAbstract
This paper presents the results of the experimental study and geochemical modeling of samples from a potential CO2 reservoir from the Ebro Basin (Spain). The reservoir samples (sandstones from Buntsandstein facies) were studied before and after being exposed to CO2 and brine during 30 days at 80 MPa and 40ºC. Sandstone samples were characterized by OpM, SEM, ADI, XRD and XRF and the brine was studied by ICP-MS. The geochemical model was constructed using the PHREEQC v.2.18 code. Post-CO2 experimental results indicate dissolution and grain detachment, as well as a 2,8% increase in porosity. Post CO2 brine analyses reveal an increase in the concentration of Ca2+ and SiO2. The modeling shows a decrease in the pH of the medium to values of 3,0 due to the acidification of the brine by dissolved CO2, corroborating the conditions for dissolution processes of carbonates and silica cement. In general, the study indicates that the initial conditions of interaction CO2 - rock - brine interaction mainly induce dissolution with mineralogical and textural readjustments in the external area of the samples.
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Copyright (c) 2025 Natasha Acosta Pérez, Sara Roces Heres, Paula Fernández-Canteli, Edgar Berrezueta

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