川南红层地区地下水赋存环境及水化学特征分析—以宜宾市屏山县为例

在对宜宾市屏山县地区地下水水文地质调查的基础上，对屏山地区地层分布、构造及含水特征等地下水赋存环境进行了研究，将地下水分为松散岩类孔隙水、基岩裂隙水、碎屑岩类孔隙裂隙层间水和碳酸盐类裂隙溶洞水；通过分析研究区122组水质样品的水化学特征，结合Piper三线图，建立了地下水类型空间分布图；在此基础上，利用相关性分析、主成分分析和离子比例系数分析，解释了地下水的控制性影响因素，揭示了屏山地区地下水化学空间分布特征及成因规律。结果表明：屏山地下水类型主要以HCO3--Ca2+、HCO3-·SO42--Ca2+、HCO3--Ca2+·Mg2+和HCO3-·SO42--Ca2+·Mg2+型为主，主要受到地层岩性的溶滤作用和大气降雨的影响，对指导川南地区地下水开发利用规划具有重要的现实意义。

Groundwater Occurrence Environment in the Red Beds of Southern Sichuan and the Hydro-chemical Characteristic: A Case Study in Pingshan County, Yibin City

Based on the hydro-geological investigation of groundwater in Pingshan area of Yibin City, the groundwater occurrence environment, such as stratigraphic distribution, formation structure and water-bearing character in Pingshan area, is studied, the underground water is classified as pore water in loose rock strata, fissure water in bedrock, interlayer water in clastic rock and water in carbonate karst fissure. Through the analysis on the hydro-chemical characteristics of 122 groups of water sample in the study area, the spatial distribution map is established based on the Piper trilinear diagram; on this basis, the controlling factors of groundwater are explained by correlation analysis, principal component analysis and ion ratio coefficient analysis; and the spatial distribution characteristics of groundwater hydrochemistry in Pingshan area and the formation causes are revealed. The research results show that the groundwater in Pingshan area mainly are of HCO3--Ca2+, HCO3-·SO42--Ca2+, HCO3--Ca2+·Mg2+ and HCO3-·SO42--Ca2+·Mg2+ types, which is mainly influenced by the dissolution and filtration of stratigraphic lithology and atmospheric rainfall. The fundamental data is of great practical significance to guide the groundwater exploration and utilization in the Southern Sichuan.