Crack Healing and Micro-crack Formation in Granite under Conditions of High Temperature and in the Presence of Pressurized water(Student Poster Session)

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As a part of a research programme investigating the geothermal reservoir potential of deep-seated high-temperature rock masses, experiments have been undertaken to determine the crack behaviour induced by hot-rock/water interaction. Cylindrical specimens of Iidate Granite were heated, whilst subject to static water conditions, under some confining pressure. The effect of temperatures of up to 600℃ was investigated, whilst the pore fluid and confining pressures were maintained at 50 and 100 MPa respectively. The time-dependence of the water/rock interaction, under these conditions, was also determined, with experiments ranging in duration from 0.5 to 96 hours. Experiments to date, have investigated the quartz constituent of the Iidate Granite samples and results show that crack healing in quartz grains is significant at temperatures of 330℃ and above. This temperature effect is also enhanced with increasing time. No crack healing in quartz is observed at temperatures of 250℃. Additional experiments, using the indentation fracture method, show that these healed cracks recover strength to that of the matrix quartz grains. Although these results might appear to indicate that significant permeability enhancement should not be expected in a supercritical geothermal reservoir, micro-structural data show that significant intragranular micro-cracking also occurs at the temperatures greater than 400℃ due to the water/rock interaction. This micro-cracking phenomenon results in an overall increase in the permeability of the granite. This research presents important results which require due consideration in the potential development of a supercritical deep-seated geothermal reservoir.
社団法人日本機械学会の論文
2001-10-20

Crack Healing and Micro-crack Formation in Granite under Conditions of High Temperature and in the Presence of Pressurized water(Student Poster Session)

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