The composition of this rock mass can vary greatly. Since Mesozoic, it is mostly intermediate-acid intrusive rock, but it can also be Mesozoic-Cenozoic metamorphic rock or even massive sedimentary rock with huge thickness. Dry-hot rock is mainly used to extract its internal heat, so its main industrial index is the internal temperature of rock mass.
Related information:
Geothermal energy: the thermal energy existing in rocks, soils, fluids and magma inside the earth that can be exploited and utilized by human beings. Dry-hot rock: rock mass containing no or only a small amount of fluid, with a temperature higher than 180 degrees Celsius, and its thermal energy can be utilized under the current technical and economic conditions.
Enhanced geothermal system (EGS): Also known as engineering geothermal system, it is an artificial geothermal system for developing geothermal energy of dry-hot rocks or strengthening the development of geothermal energy with low porosity and low permeability.