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Hydraulic and Mechanical Responses of Porous Sandstone During Pore Pressure-Induced Reactivation of Fracture Planes: An Experimental Study
Abstract Herein, we subjected Kimachi sandstone samples to several experimental tests to identify the hydraulic and mechanical responses associated with fracture plane reactivation induced by elevated pore-fluid pressure. In particular, fracture plane reactivation was achieved through a series of pore pressure increments under stress conditions controlled using a true triaxial test apparatus. A hydraulic line equipped in the direction of the intermediate principal stress allowed direct measurement of each specimen’s permeability in the direction nearly parallel to the pre-generated fault plane. Flow pump tests were performed to measure the permeability evolution. Two Kimachi sandstone samples were used to test different confinement conditions, and the measured hydraulic and mechanical responses (stress, displacement, and permeability) exhibited instantaneous changes at elevated pore pressures. Irreversible and anisotropic displacement measurements indicated fracture reactivation. Micro-focused X-ray computed tomography imaging and photomicrography were used to characterize internal fracture configurations and revealed the formation of cataclastic fracture surfaces that contributed to permeability reduction during pore pressure tests.
Hydraulic and Mechanical Responses of Porous Sandstone During Pore Pressure-Induced Reactivation of Fracture Planes: An Experimental Study
Abstract Herein, we subjected Kimachi sandstone samples to several experimental tests to identify the hydraulic and mechanical responses associated with fracture plane reactivation induced by elevated pore-fluid pressure. In particular, fracture plane reactivation was achieved through a series of pore pressure increments under stress conditions controlled using a true triaxial test apparatus. A hydraulic line equipped in the direction of the intermediate principal stress allowed direct measurement of each specimen’s permeability in the direction nearly parallel to the pre-generated fault plane. Flow pump tests were performed to measure the permeability evolution. Two Kimachi sandstone samples were used to test different confinement conditions, and the measured hydraulic and mechanical responses (stress, displacement, and permeability) exhibited instantaneous changes at elevated pore pressures. Irreversible and anisotropic displacement measurements indicated fracture reactivation. Micro-focused X-ray computed tomography imaging and photomicrography were used to characterize internal fracture configurations and revealed the formation of cataclastic fracture surfaces that contributed to permeability reduction during pore pressure tests.
Hydraulic and Mechanical Responses of Porous Sandstone During Pore Pressure-Induced Reactivation of Fracture Planes: An Experimental Study
Asahina, Daisuke (author) / Pan, Peng-Zhi (author) / Sato, Minoru (author) / Takeda, Mikio (author) / Takahashi, Manabu (author)
2019
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Brittle failure and fracture reactivation in sandstone by fluid injection
| Taylor & Francis Verlag | 2015
Induced pore pressure response during undrained deformation of tuff and sandstone
| British Library Online Contents | 1995
Fault reactivation via pre-existing fracture networks during hydraulic fracturing
| TIBKAT | 2019