Deformation characteristics of a clayey interbed during fluid injection

Injection into the shallow aquifer-aquitard system beneath Mexico City for counteracting pore pressure declines due to deeper groundwater withdrawals: Analysis of one injection well

“…As a result of this practice, the effective stress is decreased causing the aquitard to recover a small portion of the total deformation (stress path 2-3). Evidence of this response has been found during underground injection tasks conducted in several sites around the world (Zhang et al, 2015;Zhou and Burbey, 2014;Amelug et al, 1999), where decrements in effective stress have been indirectly verified by measuring expansions at specific hydrostratigraphic units of the injection formation. For the shallow aquifer beneath Mexico City, the limiting value of the increment in pore pressure may be bounded by the hydrostatic profile, yet theoretically, only a small value is needed in order to mitigate subsidence.…”

Study of Characteristics of Fault Slip and Induced Seismicity during Hydraulic Fracturing in HDR Geothermal Exploitation in the Yishu Fault Zone in China

“…where f is the volumetric flux vector, m/s, κ is the intrinsic permeability of the medium, m 2 , μ is the viscosity, Pa•s, and ∇p is the pressure gradient vector, Pa/m. The mass conservation equation of pore fluid is [35]:…”

Uncertainty analysis of impact indicators for the integrity of combined caprock during CO2 geosequestration

“…To date, ensuring caprock integrity constitutes is one of the key aspects of safety that studied previously by many different researchers. Significant progress has been made in appraising the geomechanical stability and sealability of caprock at CO 2 storage sites, including such considerations as maximum sustainable fluid pressure (Rutqvist et al, 2007), old fault reactivation (Streit and Hillis, 2004), caprock integrity and sealability (Zhou and Burbey, 2014). The coupled flow and stress processes leading to mechanical failure in caprock were examined by Rutqvist and Tsang (2002), who demonstrated surface uplift attributed to the pressureinduced expansion of aquifers and caprock, as well as CO 2 leakage through a pre-existing caprock fault whose permeability is a function of the stress-dependent porosity.…”