潘谢矿区灰岩地下水水化学特征与成因分析

Water chemistry characteristics and their causes of limestone groundwater in Panxie Mining Area

灰岩水是潘谢矿区的主要充水水源,对煤田的开采具有潜在的水害威胁。本文采用Piper三线图、饱和指数及离子比例系数分析了灰岩水水化学特征。结果表明:潘谢矿区灰岩水为弱碱性水,阳离子以Na+离子为主,太灰水水化学类型以Cl-Na为主,奥灰水水化学类型多为Cl-Na和Cl·HCO3-Na;岩盐溶解是潘谢矿区灰岩水形成Cl-Na型水质的主要原因,奥灰水HCO3-来源于方解石和白云石,Na+因交替吸附作用而成为主要阳离子。

Limestone water is the main water-filling source of PanXie mining area,and has potential water hazard threat to coal mining activities.The water chemistry characteristics and formation factors of limestone water were discussed using piper three-line diagram,saturation index and ion scale coefficient.The results showed that:(1)limestone water was weak alkaline and the main cation was Na+ions.The chemical type of the Carboniferous Taiyuan Formation limestone water is mainly Cl-Na,and the chemical types of the water of the Ordovician limestone water are mostly Cl-Na and Cl·HCO3-Na.(2)The dissolution of rock salt is the main reason for the limestone water Cl-Na type water in the study area.The HCO3-ions in the Ordovician limestone water are derived from calcite and dolomite.However,due to the alternating adsorption of cations,the cation content is still dominated by Na+ions.