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济南北部地热水水化学特征及其形成机理
Hydrochemical Characteristics and Formation Mechanism of Geothermal Water in Northern Ji’nan

DOI: 10.3799/dqkx.2018.206

Keywords: 地下热水, 水文地球化学, 形成机理, 反向地球化学模拟, 地球化学
geothermal water
, hydrogeochemical, formation mechanism, inverse geochemical~modelling, geochemistry

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Abstract:

对地热水水化学特征及其形成机理进行研究可以为地热资源开发与保护提供水文地球化学依据.目前缺乏对济北地热田水化学形成机理的研究,限制了该地热田的开发.通过对南部岩溶冷水、地热田地热水采样,并综合运用Pipper三线图、相关性分析、离子比值法、矿物饱和指数法及反向地球化学模拟等手段,对该地热田地热水水化学形成机理展开研究.结果表明,由南向北,地下水中TDS含量及主要离子含量均有一定的上升趋势,地下水水化学类型由HCO3Ca型向HCO3-C-Mg、SO4Ca、SO4Ca-Na型转化,表现出明显的分带特征;碳酸盐、硫酸盐矿物、岩盐矿物的溶解—沉淀是控制本区地下水水化学特征的重要过程,同时伴随着钠长石、钾长石等硅酸盐矿物的溶解,南部冷水受到了人类活动的影响.
Study on the hydrochemical characteristics and formation mechanism of geothermal water can provide the hydrogeochemical basis for the exploitation and protection of geothermal resources. The insufficient research of hydrochemical formation mechanism is a limitation in the development of geothermal water in northern \mbox{Ji’nan}. Water samples were collected in southern Karst and geothermal wells in this paper. Methods including \mbox{Piper’s} triliner diagram, correlation analysis, ion ratio, mineral saturation index and the inverse geochemical modelling were employed to analyze the hydrochemical characteristics and formation mechanism. The results show that from south to north, the concentration of TDS and main ion content showed a rising trend, and the groundwater chemical types change from HCO\textsubscript{3}{\hyphen{}}Ca to HCO\textsubscript{3}{\hyphen{}}Ca$\cdotp $Mg, SO\textsubscript{4}{\hyphen{}}Ca, SO\textsubscript{4}{\hyphen{}}Ca$\cdotp $Na showing zoning characteristics. Carbonate, sulfate minerals and halite mineral dissolution{\hyphen{}}precipitation in this area were the dominant hydrogeochemical processes to control the groundwater chemical characteristics, accompanied by the dissolution of albite, K{\hyphen{}}feldspar and other silicate minerals. However, southern cold water is affected by a certain degree of human~activity

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