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This study develops a new approach which can simultaneously calculate the hydraulic permeability, electrical resistivity and elastic wave velocity from the digital image of natural rock fracture. The ...digital fracture simulation is applied to natural single fracture which was cored from geothermal area and validate that performance by comparing experimental results. The fluid-flow experiment is conducted in a pressure vessel which simulates the pressure condition of the geothermal area. As a result, resistivity and velocity show thresholds at the same pressure condition (~5 MPa in our study) while decreasing rates of them with aperture opening were different at 0.8 mm or higher aperture condition (decreasing rate of resistivity is ~60 Ωm while that of velocity is ~80 m/s per 0.1 mm aperture change). These behaviors may be controlled by connection or disconnection of the fluid pathway and will be used for subsurface monitoring by using velocity and/or resistivity.続きを見る
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