耦合CO2脱气的岩溶地热水结垢趋势定量分析

吕良华, 王水

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地学前缘 ›› 2024, Vol. 31 ›› Issue (3) : 402-409. DOI: 10.13745/j.esf.sf.2023.2.82
地下水与地热资源

耦合CO2脱气的岩溶地热水结垢趋势定量分析

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Quantitative analysis of scaling tendency of karstic geothermal water coupled with CO2 degassing

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摘要

岩溶地热系统是最具开发潜力的水热型地热系统之一,在水热型地热资源利用中,地热水结垢(尤其是井下结垢)是目前面临的最普遍、最重要的问题之一,制约着地热水资源可持续利用。针对岩溶地热水结垢趋势分析方法存在的不足,在重点考虑CO2脱气这一重要过程对结垢趋势影响的基础上,利用化学热力学模拟技术构建了一种耦合CO2脱气过程的结垢趋势定量分析的改进方法,并将其应用于南京汤山岩溶地热区。结果表明汤山地区地热水不具有发生SiO2结垢的趋势;在井口有发生碳酸盐结垢趋势,主要成分为CaCO3;井筒中下部有发生不同程度的硫酸盐结垢趋势,主要成分为CaSO4,SrSO4,BaSO4。本研究在改进结垢趋势分析方法不足的同时,为防垢除垢工作提供了理论基础和方法指导,可有力促进地热水资源的可持续利用。

Abstract

Low-to-medium temperature fluid reservoirs hosted in carbonate rocks represent a promising yet relatively unknown hydrothermal geothermal system. Scaling of geothermal water, particularly underground scaling, poses a significant challenge in the sustainable utilization of geothermal resources. To address the limitations of current methods for analyzing karstic geothermal water scaling trends, a chemical thermodynamic simulation approach was employed to develop an enhanced method for quantitatively assessing scaling trends in geothermal water, considering CO2 degassing effects. This study focused on the influence of CO2 degassing on scaling trends. The scaling tendency of the Tangshan karstic geothermal area in Nanjing was quantitatively analyzed using the improved method. Results indicate that the geothermal water in the Tangshan area exhibits a propensity for carbonate scaling at the wellhead, primarily composed of CaCO3, and varying degrees of sulfate scaling in the middle and lower sections of the wellbore, with main components including CaSO4, SrSO4, and BaSO4. By addressing the limitations of existing scaling trend analysis methods, this study offers a theoretical foundation and methodological guidance for scale prevention and removal, thereby facilitating the sustainable utilization of geothermal water resources.

关键词

岩溶地热水 / 可持续利用 / 结垢趋势分析 / CO2脱气 / 地球化学模拟 / 汤山

Key words

karstic geothermal water / sustainable utilization / analysis of scaling tendency / CO2 degassing / geochemical modeling / Tangshan

中图分类号

P641

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导出引用
吕良华 , 王水. 耦合CO2脱气的岩溶地热水结垢趋势定量分析. 地学前缘. 2024, 31(3): 402-409 https://doi.org/10.13745/j.esf.sf.2023.2.82
Lianghua LÜ, Shui WANG. Quantitative analysis of scaling tendency of karstic geothermal water coupled with CO2 degassing[J]. Earth Science Frontiers. 2024, 31(3): 402-409 https://doi.org/10.13745/j.esf.sf.2023.2.82

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基金

国家自然科学基金项目(42202281)
江苏省卓越博士后计划项目(2023ZB141)

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