Effective Confining stress Depending on Fluid Flow and Capillary Sealing Properties of Mudstones for CO2 Geological Sequestration

Abstract In this study, we investigated effective pressure of dependence on hydraulic properties (i.e. threshold pressure and permeability) of Kazusa group mudstones, which is taken from Boso peninsula in Japan, at 40 °C and effective pressures up to 20 MPa. Additionally, to assess a correlation between these properties, a porosity change depending on effective stress is also examined. Our results demonstrates that for mudstones tested, the relationship between threshold pressure and permeability depends strongly on changes in pore structures as a function of effective pressure.