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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >EXPERIMENTAL APPROACH TO UNDERSTANDING WATER-ROCK INTERACTIONS IN ENHANCED GEOTHERMAL SYSTEMS
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EXPERIMENTAL APPROACH TO UNDERSTANDING WATER-ROCK INTERACTIONS IN ENHANCED GEOTHERMAL SYSTEMS

机译：认识强化地热系统中水-岩相互作用的实验方法

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摘要

Batch- and flow-reactor autoclave systems were used to investigate granite and quartz dissolution processes, with pure water, under sub- and supercritical conditions (up to 600℃, 60MPa), to evaluate geothermal reservoir dynamics in a potential, deep-seated, enhanced geothermal system. Development of engineered reservoirs for Hot Dry Rock (HDR) geothermal energy extraction depend on the maintenance of (fracture) surfaces areas for heat exchange, yet precipitation of quartz (as a result of retrograde solubility at >380℃), albite and other minerals occur, which effectively 'plug' the system. The supercritical region, above the critical point for water (～374℃, 22 MPa), is not a homogeneous state, but comprises 'liquid-like' and 'vapour-like' regions, based on the dissolution behaviour of granite and quartz. Solvent properties in the liquid-like, 'high-pressure' supercritical region are similar to subcritical water. In contrast, dissolution reactions in the vapour-like, 'high-temperature/low pressure' supercritical region are weak, and provide optimum conditions for energy utilization of an artificial HDR reservoir.
机译：分批和流动反应釜系统用于研究亚临界和超临界条件（最高600℃，60MPa）下纯水对花岗岩和石英的溶解过程，以评估潜在的深层地热储层动力学。增强的地热系统。开发用于热干岩（HDR）地热能的工程油藏的开发取决于维持（裂缝）表面积以进行热交换，但石英（由于在380℃以上的逆行溶解度而沉淀），钠长石和其他矿物会沉淀出来，从而有效地“插入”系统。在高于水的临界点（〜374℃，22 MPa）以上的超临界区域不是均质状态，但根据花岗岩和石英的溶解行为，包括“液体状”和“蒸气状”区域。液体状“高压”超临界区的溶剂性质类似于亚临界水。相反，在类似蒸气的“高温/低压”超临界区域中的溶解反应较弱，为人工HDR储层的能源利用提供了最佳条件。

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