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地热系统存在于多种地壳环境中。本文重点讨论那些位于活动的或近期活动的火山作用地区的地热系统。在这些地区中,深部(达8公里)的岩浆热使上部地壳中的地下水发生对流。热水(或蒸气)流动受地壳的渗透性所控制。最近的资料强调了次生渗透性(尤其是次生裂隙)的主要作用。在这些地热系统
Geothermal systems exist in many crustal environments. This article focuses on geothermal systems that are located in volcanic areas that are active or near-term activities. In these areas, deep magma heat (up to 8 km) convects groundwater in the upper crust. Hot water (or steam) flow is controlled by the permeability of the crust. Recent data highlight the primary role of secondary permeability, especially secondary cracks. In these geothermal systems