The fracturing of granite and single crystal quartz at sub- and supercritical hydrothermal conditions was investigated in order to advance the utilisation of Enhanced Geothermal (reservoir) Systems (EGS). No changes (i.e. fracturing) were observed at "dry" conditions, for both granite and single crystal quartz (at any temperature-pressure conditions), but fracturing was recognized in "wet" conditions. In our experiments, fracturing was accelerated in the presence of water, and we propose optimal conditions for Hydrothermally-Derived Fracturing (HDF) of granite. Hydrothermally-Derived Fracturing (HDF) can be utilized for future development of Enhanced Geothermal (reservoir) Systems (EGS), by which fluid flow pass and heat exchange in the deep-seated hydrothermal reservoir is drastically enhanced by utilizing HDF.
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