Critical pore pressure assessment for CO 2 geological storage in Gyeongsang Basin, Korea, from a geomechanics perspective

摘要: We use a relatively simple analytic model incorporating two primary geomechanical factors–in situ stress and frictional coefficient of discontinuity–to assess the critical pore pressure increase associated with CO2 geological storage that initiates shear activation pre-existing fractures faults. Shear fractures/faults can break sealing integrity along discontinuities, providing possible leakage channels. With an example Gyeongsang Basin, Korea, which is considered potential onshore site, available in measurement data are analyzed to infer states at assumed depth 1 km. The magnitudes basin characterized by their spatial heterogeneity, implying may vary depending on locations. As another factor for analysis, shown be possibly correlated clay content host rocks encompassing infillings within demonstrates possibility estimating property from measurable using borehole geophysical logs. Based conditions coupled change 0.6, estimated, would induce well-orientated discontinuities slip under given consequently provide pathways. estimated as upper bound allowable 4–8 MPa above hydrostatic most basin, whereas same 0–4 southern part basin. These results useful site selection stage project.