Geothermal is a system involving a circulation of water from the earth's surface down to the earth's interior where the water picks up heats from the depth. The hot fluids then stay at depth and create geothermal reservoir. A fraction of the fluids often emerge at the surface in the form of hotsprings, geysers, and fumaroles. The hot fluids from the reservoir are useful for electric generations and other direct usage. To explore this system, The knowledge on geology, geochemistry, and geophysics is essential.
The flowline begins with geology and geochemsitry field works. And from their studies, when a direct evidence of deep reservoir containing high enthalpy fluids is found. the geophysical work could be started with the objective is to image the geometry, and the location of the prospect. A 3-D join inversions of multi-phycisal properties is a common practice firstname.lastname@example.org
There are various classifications of the systems, which based on various parameters, such as enthalpy, tectonic settings, fluid content, and entropy. Enthalpy, or spesific heat content of the reservoir fluids is commonly used to describe a geothermal system, namely high enthalpy, medium, and low enthalpy systems. In the SI systems enthalpy has the unit of kilojoules/kilogram (kJ/kg), thus the higher the enthalpy the more heat is brought by the carrying fluids to tthe surface compared to those low enthalpy systems. Therefore, high entalpy systems have more commercial values. The fluid content inside the reservoir is also commonly used to describe the systems, where three types are well known, i.e. vapor dominated, liquid dominated, and two-phase systems.
Permeability structures together with the heatsource, they drives the development of a geothermal system. Consider a reservoir with a reasonably high porosity and permeability. the reservoir is surrounded by a recharge belt and equipped with an overlying cap having a certain range of permeability. The reservoir is filled with a cold water, having a temperature that matches with the normal geothermal temperature gradient. When a heat pulse is conducted to the bottom of the reservoir at a right quantity and at the right duration, various geothermal systems are produced.
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