ABSTRACT
The quest for sustainable energy has increased interest in deep geothermal heat extraction, with granite being a promising rock due to its abundance and thermal properties. This study examines the thermal, physical, and mechanical properties of granite rock under thermal shock conditions, which resemble deep geothermal reservoirs. To imitate thermal shock, granite samples were heated to 800°C in a muffle furnace and immediately cooled with water. Further, the thermal conductivity, specific heat capacity, P-wave velocity, density, and stress-strain correlations from triaxial tests under 5, 10, and 15 MPa confining pressures were measured. These data are critical for evaluating subsurface heat storage and geothermal potential at different temperatures. P-wave velocity, density, and thermal conductivity decrease with temperature, but specific heat capacity increases. Higher confinement pressures improve mechanical characteristics, whereas higher temperatures and lower confining pressures increase stress-strain curve compaction non-linearity. These results improve geothermal reservoir development and heat extraction.
