| Abstract |
Injection-induced seismicity poses a significant concern in a range of subsurface reservoir applications, including enhanced geothermal systems, waste fluid disposal, and oil and gas production in tight formations. Numerous studies have endeavored to elucidate the key parameters influencing injection-induced seismicity, encompassing fault roughness, fault mineralogy, stress state, injection rate, injection volume, fluid properties, and fluid-rock interactions. Nonetheless, substantial gaps persist in comprehending the interrelationships among fault reactivation, injection schemes, slip behavior, and resultant fault permeability. In this study, we conduct laboratory experiments and investigate injection-induced shear slips in fractures that are mechanically fractured at a pre-defined inclined angle to the main flow axis before injection. Water is injected into the fracture at critical stress state to reactivate the shear slip, while various measurements will be used to monitor slip behaviors, including pore fluid pressure, confinement stress, slip distance, permeability, and acoustic emission. Our findings shed lights onto the understanding of the hydro-mechanics that govern permeability changes during mechanically- and injection-induced shear failure and the potential for linking fracture deformation and acoustic emission signals. |