Abstract
In this paper, the hydraulic and heat-transfer properties of two sets of artificially fractured granite samples are investigated. First, the morphological information is determined using 3D modelling technology. The area ratio is used to describe the roughness of the fracture surface. Second, the hydraulic properties of fractured granite are tested by exposing samples to different confining pressures and temperatures. The results show that the hydraulic properties of the fractures are affected mainly by the area ratio, with a larger area ratio producing a larger fracture aperture and higher hydraulic conductivity. Both the hydraulic apertureand the hydraulic conductivity decrease with an increase in the confining pressure. Furthermore, the fracture aperture decreases with increasing rock temperature, but the hydraulic conductivity increases owing to a reduction of the viscosity of the fluid flowing through. Finally, the heat-transfer efficiency of the samples under coupled hydro-thermal-mechanical conditions is analysed and discussed.
Highlights
Thermal Diffusivity 10−6 m2/s suggested a decrease in the coefficient with increasing confining pressure
To quantitatively analyse the hydraulic properties of fractured rocks, morphological information about the fractures is indispensable. By considering these existing problems, this paper aims to investigate the hydraulic properties of six fractured granite samples with a focus on to the surface conditions of the fractures
The morphological characteristics of fractures were studied in the two sets of granite samples
Summary
Thermal Diffusivity 10−6 m2/s suggested a decrease in the coefficient with increasing confining pressure. Morrow et al.[14] conducted a complete granite and fractured granite seepage test under high-temperature conditions (300–500 °C). The studies described above investigated the hydraulic properties of fractured rocks by considering different coupling conditions[9,10,11,12,21,22,23,24,25,26]. To quantitatively analyse the hydraulic properties of fractured rocks, morphological information about the fractures is indispensable By considering these existing problems, this paper aims to investigate the hydraulic properties of six fractured granite samples with a focus on to the surface conditions of the fractures. The study area is located in the Gonghe-Guide basin in Qinghai Province and lies between the Kunlun-Qinling Mountains and the Hexi structural belt. This was the first confirmation of such a large-scale HDR reservoir in China
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