许疃煤矿砂岩裂隙水水文地球化学特征分析

Analysis of Hydrogeochemical Characteristics of Sandstone Fissure Water in Xutuan Coal Mine

摘要: 地下水水化学研究有助于了解地下水的成分及其来源，还能为保障水资源安全、合理开发和保护地下水资源提供理论支持。本次以许疃煤矿砂岩裂隙水6个含水层22组水样为研究对象，采用数理统计和离子比值法对含水层主要离子浓度进行分析，得出研究区地下水阳离子以K⁺ + Na⁺为主、阴离子以${\text{HCO}}_3^{-}$ +${\text{CO}}_3^{2-}$ 为主。通过Piper三线图分析得出含水层水化学主要的水化学类型为${\text{SO}}_4^{2-}$ - K⁺ + Na⁺型。利用离子比值法分析可知，研究区含水层中地下水离子主要来源于硅酸盐的风化及氯化物(主要为盐岩)、碳酸盐矿物、硫酸盐矿物的溶解作用。此外，研究探讨了影响地下水化学成分的控制因素，通过对地下水来源的深入分析，为许疃煤矿砂岩裂隙水的合理开发、利用与保护提供了科学依据。本研究不仅有助于提升对该地区地下水资源的认识，也为类似地质条件下的地下水研究提供了参考。

Abstract: Research on groundwater hydrochemistry helps to understand the composition and sources of groundwater, and provides theoretical support for ensuring water resource security, as well as the rational development and protection of groundwater resources. In this study, 22 water samples from 6 aquifers of sandstone fissure water in the Xutuan Coal Mine were analyzed using mathematical statistics and ion ratio methods to determine the main ion concentrations in the aquifers. The results show that the cations in the groundwater of the study area are dominated by K⁺ + Na⁺, while the anions are dominated by ${\text{HCO}}_3^{-}$ + ${\text{CO}}_3^{2-}$ . Piper trilinear diagram analysis reveals that the main hydrochemical type of the aquifer is ${\text{SO}}_4^{2-}$ - K⁺ + Na⁺. Ion ratio analysis indicates that the ions in the groundwater of the study area primarily originate from the weathering of silicates and the dissolution of chloride minerals (mainly halite), carbonate minerals, and sulfate minerals. Furthermore, the study explores the controlling factors influencing the chemical composition of groundwater. Through an in-depth analysis of groundwater sources, scientific basis is provided for the rational development, utilization, and protection of sandstone fissure water in the Xutuan Coal Mine. This research not only enhances the understanding of groundwater resources in the region but also provides a reference for groundwater studies under similar geological conditions.