矿区砂岩含水层水岩作用及水化学特征研究——以青东煤矿为例
Study on Water-Rock Interaction and Hydrochemical Features of Sandstone Aquifer in Mining Area—Taking Qingdong Coal Mine as an Example

本文以青东煤矿砂岩含水层23组样品为研究对象，运用Piper三线图、离子浓度直方图、主成分分析、相关性分析等方法，对该含水层的水化学特征、水岩相互作用以及离子来源等水文地球化学特征进行研究。结果表明：常规离子含量排序为： > Na K > > Cl^？ > Ca² > > Mg² ，阴阳离子的优势离子分别是和Na K ；主成分表明主成分1中Ca² 和Cl^？均有较强的正相关，Cl^？含量与岩盐矿物溶解有关，Ca² 的含量较高说明阳离子交替吸附作用较为明显，主成分2中Ca² 、Mg² 荷载值较高，其次为，说明其水化学作用主要为硫酸盐岩矿物溶解，主成分3中K Na 、有强正相关，与Cl^？有中相关，代表了硫酸岩矿物、岩盐等矿物的溶解；相关性分析表明，砂岩含水层中对pH起主要影响作用，K Na 和、Ca² 和Mg² 之间的正相关性较强，主要源于硅酸盐矿物的风化和硫酸盐岩矿物的溶解，K Na 和Cl^？呈中等正相关，说明这些元素可能来自于岩盐。
In this study, 23 sets of samples of sandstone aquifer in Qingdong Coal Mine were taken as the research object, and the hydro geochemical features such as hydrochemical features, water-rock interaction and ion source were studied by using Piper three-line diagram, ion content histogram, principal component analysis and correlation analysis. The results showed that the orders of ion contents were > Na K > > Cl^？ > Ca² > > Mg² , respectively, the dominant ions of anions and cations were and Na K . The principal component indicated that Ca² and Cl^？ had a strong positive correlation in principal component 1, and the content of Cl^？ was related to the dissolution of rock salt minerals. The high content of Ca² suggested that the cation exchange was more obvious. The load values of Ca²