Creep of CarbFix basalt: influence of rock–fluid interaction

Abstract. Geological carbon sequestration provides permanent CO2 storage to mitigate the current high concentration of in atmosphere. mineralization basalts has been proven be one most secure options. For successful implementation and future improvements this technology, time-dependent deformation behavior reservoir rocks presence reactive fluids needs studied detail. We conducted load-stepping creep experiments on from CarbFix site (Iceland) under several pore fluid conditions (dry, H2O saturated + saturated) at temperature, T?80 ?C effective pressure, Peff=50 MPa, during which we collected mechanical, acoustic chemistry data. observed transient stresses as low 11 % failure strength. Acoustic emissions (AEs) correlated strongly with strain accumulation, indicating that was a brittle process agreement microstructural observations. The rate magnitude AEs were higher fluid-saturated than dry conditions. infer predominant mechanism governing is time- stress-dependent subcritical dilatant cracking. Our results suggest aqueous exerts first-order control basaltic rocks, while composition plays only secondary role