Abstract
Young's modulus of granitic rock samples under the simulated conditions of a geothermal reservoir, such as a pressurized high temperature water environment up to 350°C, was measured by means of the compliance calibration technique. The results obtained indicate a significant change in modulus with increasing test temperature and exposure time in a hydrothermal environment, which can be considered as a consequence of an increase in microcrack aperture due to chemical dissolution. The applicability of the laboratory results to hot dry rock geothermal field data is also demonstrated.
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