在高温水岩相互作用下,花岩和加布罗的元素溶解特性
Shutao Zhou1, Qiang Sun2, He Zhang1
1College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China.
The Science of the total environment
|July 13, 2023
概括
增强地热系统 (EGS) 中的水岩相互作用导致矿物溶解,影响水库完整性. 温度显著影响溶解速率,超临界水条件导致急剧变化,影响地热能源开发.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 地球科学 地球科学 地球科学
背景情况:
- 增强地热系统 (EGS) 涉及将水注入热干岩 (HDR) 中以提取热能.
- 在高温下,水与岩石的相互作用会导致矿物质溶解,可能损害人工水库,并阻碍地热能源的开发.
研究的目的:
- 为了研究温度对溶液组成和矿物溶解在水与岩石相互作用后的影响.
- 分析花岩和岩在不同的热条件下溶解的行为,这与EGS相关.
主要方法:
- 在不同的热处理温度下对石和花岩进行了水岩相互作用实验.
- 分析了溶液组成和矿物溶解的变化,使用感应合等离子体质谱 (ICP-MS) 和X射线衍射 (XRD).
主要成果:
- (Si) 是主要溶解物,主要来自石英溶解,金属元素 (Na,K,Ca,Al,Mg) 的溶解率较低.
- 在花岩系统中,金属元素在较低的温度 (150-180°C) 中溶解更多,而Si溶解在超临界条件附近达到峰值.
- 和金属元素的溶解速率最初随着温度的增加而增加,然后降低,在超临界水态附近观察到的突然变化.
结论:
- 温度和水的物理状态 (从亚临界到超临界) 显著影响EGS中的矿物溶解率.
- 了解这些水岩相互作用对于预测和减轻地热环境中的岩石腐蚀疲劳和矿物缩放至关重要.
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