CO2 Injection-Induced Shearing and Fracturing in Naturally Fractured Conventional and Superhot Geothermal Environments
نویسندگان
چکیده
Abstract This study elucidates the possibility of CO 2 injection-induced formation a complex cloud-fracture network (CFN) in granite, along with shearing (shear slip) natural pre-existing fractures under conventional (~ 150–300 °C) and superhot (> ~ 400 geothermal conditions, potentially providing additional connecting flow paths between stimulated fractures. Here, we conduct set experiments triaxial stress states at 150 °C 450 on cylindrical granite samples containing sawcut (representing fracture) inclined 45° from sample’s axis. injection induced dynamic shear slip sawcut, higher velocities owing to elasticity rock than that °C. The lower viscosity also allowed it more uniformly pressurize resulting displacements compared those based water experiments. implies can stimulate same volume as injection-well pressures. CFNs then formed via pressures similar predicted by Griffith failure criterion progressed both experimental temperatures. revealed potential challenges associated naturally fractured environments, such narrow aperture CFNs, decreasing differential during their formation; all these factors should be addressed future research.
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ژورنال
عنوان ژورنال: Rock Mechanics and Rock Engineering
سال: 2022
ISSN: ['0723-2632', '1434-453X']
DOI: https://doi.org/10.1007/s00603-022-03153-7