深部超临界地热条件下钾长石的溶解特征-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

深部超临界地热条件下钾长石的溶解特征

Dissolution law of potassium feldspar under deep supercritical geothermal conditions

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DOI	10.20086/j.cnki.yskw.2025.4102
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(3)
作者	郜世隆，许天福，袁益龙*，钟承昊，封官宏,
作者单位	吉林大学地下水资源与环境教育部重点实验室, 吉林长春 130021
摘要	超临界地热资源是一种潜力巨大的可再生清洁能源,其形成和开发过程伴随着强烈的水岩化学反应。本研究通过开展300~500℃和25~50 MPa条件下钾长石在纯水中的溶解实验,明确了亚临界至超临界地热条件温度和压力变化对钾长石溶解度的影响,揭示了其溶解行为的演变机理。结果表明: ① 亚临界和超临界地热条件下温度和压力均是影响钾长石溶解度的重要因素; ② 在400℃条件下,钾长石溶解度与压力保持着正相关关系;压力为35 MPa时,钾长石溶解度随温度增加先上升、后下降、再上升,表现出涨落现象; ③ 钾长石溶解度变化特征与水在亚临界和超临界地热条件下水的性质(密度、氢键、介电常数)急剧变化有关。研究结果有助于更好地了解超临界地热系统中的水文地球化学过程。
Abstract	Supercritical geothermal resource is a kind of renewable and clean energy with great potential. Its formation and development process is accompanied by strong water-rock chemical reaction. By conducting dissolution experiments of potassium feldspar in pure water at 300~500℃ and 25~50 MPa, this study clarified the influence of temperature and pressure changes on the solubility of potassium feldspar under sub-critical to supercritical geothermal conditions, and revealed the evolution mechanism of its dissolution behavior. The results show that: ① Both temperature and pressure are important factors affecting the solubility of potassium feldspar under subcritical and supercritical geothermal conditions. ② At 400℃, the solubility of potassium feldspar is positively correlated with the pressure. When the pressure is 35 MPa, the solubility of potassium feldspar increases first, then decreases and then increases with the increase of temperature, showing a fluctuation phenomenon. ③ The variation characteristics of the solubility of potassium feldspar are related to the sharp changes in the properties of water (density, hydrogen bond, dielectric constant) under sub-critical and supercritical geothermal conditions. The results contribute to a better understanding of hydrogeochemical processes in supercritical geothermal systems.
关键词	超临界地热；钾长石；高温高压；水岩反应；溶解度
KeyWord	supercritical geothermal; potassium feldspar; high temperature and pressure; water-rock reaction; solubility
基金项目
页码	611-618

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郜世隆，许天福，袁益龙*，钟承昊，封官宏. 深部超临界地热条件下钾长石的溶解特征 [J]. 岩石矿物学杂志. 2025; 44; (3). 611 - 618.

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