新疆焉耆盆地平原区地下水演化的主要水文地球化学过程分析

发布时间：2018-03-20 03:31

本文选题：地下水　切入点：演化　出处：《环境化学》2017年06期 　论文类型：期刊论文

【摘要】：地下水资源是焉耆盆地生活、生产及生态用水的主要供水水源.深入研究焉耆盆地地下水演化特征及水文地球化学过程对合理开发地下水资源及保护地下水环境具有重要意义.利用Gibbs图阐明了焉耆盆地平原区地下水所经历的水文地球化学作用(大气降水、蒸发浓缩和岩石风化作用等),平原区采样点主要分布在Gisbbs图的右上角及中部左侧,表明平原区地下水受风化、蒸发浓缩作用影响,且受大气降水作用影响较小;方解石、白云石等碳酸盐矿物,以及岩盐、石膏等蒸发岩的风化溶解是平原区地下水主要离子来源,应用PHREEQC地球化学模拟软件计算了平原区各矿物饱和指数,大部分采样点方解石与白云石未达到饱和状态;随着平原区地下水中的TDS和Cl-浓度的逐渐升高,Mg~(2+)在地下水中的富集受到了白云石沉淀过程的限制,而Ca~(2+)的含量随TDS的增大而持续增加,并结合平原区2011年与2014年地下水水化学Piper三线图,平原区地下水大部分呈Ca·Na型或者Ca·Mg型;地下水ORP值均为正值,表明平原区地下水处于氧化状态;根据离子比例法,γNa+/γ(Na++Ca~(2+)+Mg~(2+))比值深层承压水潜水浅层承压水,表明平原区地下水阳离子交换作用由强到弱依次为深层承压水、潜水、浅层承压水.
[Abstract]:Groundwater resources are the life of Yanqi Basin. Study on groundwater evolution and hydrogeochemical process in Yanqi Basin is of great significance for the rational development of groundwater resources and the protection of groundwater environment. The hydrogeochemical processes of groundwater in the plain area of Yanqi Basin (atmospheric precipitation, The sampling points are mainly distributed in the upper right corner of Gisbbs diagram and the left side of the central part of the Gisbbs diagram, indicating that groundwater in the plain area is affected by weathering, evaporation and concentration, and is less affected by precipitation, calcite, calcite, calcite, etc. The weathering and dissolution of carbonate minerals such as dolomite, rock salt and gypsum are the main ion sources of groundwater in plain area. The saturation index of minerals in plain area has been calculated by using PHREEQC geochemical simulation software. The accumulation of calcite and dolomite in groundwater is restricted by dolomite precipitation with the increasing of TDS and Cl- concentration in groundwater. However, the content of Ca~(2) increases with the increase of TDS. Combined with the hydrochemical Piper three-line diagram of groundwater in the plain area from 2011 to 2014, most of the groundwater in the plain area show Ca 路Na or Ca 路mg type, and the ORP value of groundwater is positive. According to the ratio of 纬 Na / 纬 -Na Ca~(2 Mg~(2), the ratio of deep confined water to shallow confined water is shallow confined water, which indicates that the cation exchange action of groundwater in plain area is in the order of deep confined water and phreatic water from strong to weak. Shallow confined water.
【作者单位】：四川大学锦城学院土木工程系;新疆农业大学水利与土木工程学院;四川大学水利水电学院;
【分类号】：P641.3

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