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Earth and Space Sciences · 术语表

什么是 Geothermal system, heat in place, enthalpy classes, EGS？

又称： geothermal system · heat in place · high-enthalpy resource · low-enthalpy resource · enhanced geothermal system

Definition 30.8 University Earth and Space Sciences — Year 2 · 第 30 章 — Energy Geology

A geothermal system is a volume of the crust where heat, permeability and water come together so that hot water or steam can be produced from wells. The heat in place of a reservoir is the heat it would give up in cooling from its temperature to a reference temperature. A high-enthalpy resource is a geothermal system above about 150 ∘C150\,{}^{\circ}\mathrm{C}; a low-enthalpy resource one below about 90 ∘C90\,{}^{\circ}\mathrm{C}; between the two the resource is called moderate. All three suit direct use of the heat, but generally only the moderate and high classes can generate electricity. An enhanced geothermal system (EGS) is a body of hot rock of low natural permeability in which permeability is created by engineering, so that water can be circulated through it and its heat recovered.

Left: a high-enthalpy geothermal system (schematic, not to scale): water recharged at the margins (blue) is heated over an intrusion and rises through a fractured reservoir (red) to a hot spring; wells tap the reservoir. Right: a geothermal power plant near Geyserville, California, in 1982, with steam pipelines on the hillside. Photograph: U.S. Department of Defense (public domain).
Left: a high-enthalpy geothermal system (schematic, not to scale): water recharged at the margins (blue) is heated over an intrusion and rises through a fractured reservoir (red) to a hot spring; wells tap the reservoir. Right: a geothermal power plant near Geyserville, California, in 1982, with steam pipelines on the hillside. Photograph: U.S. Department of Defense (public domain).
Left: a high-enthalpy geothermal system (schematic, not to scale): water recharged at the margins (blue) is heated over an intrusion and rises through a fractured reservoir (red) to a hot spring; wells tap the reservoir. Right: a geothermal power plant near Geyserville, California, in 1982, with steam pipelines on the hillside. Photograph: U.S. Department of Defense (public domain).
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