陈凯，刘启蒙，刘瑜，等. 钱营孜煤矿深部地下水水化学特征及来源解析[J]. 煤田地质与勘探，2022，50(8)：99−106. DOI: 10.12363/issn.1001-1986.21.11.0631
引用本文: 陈凯，刘启蒙，刘瑜，等. 钱营孜煤矿深部地下水水化学特征及来源解析[J]. 煤田地质与勘探，2022，50(8)：99−106. DOI: 10.12363/issn.1001-1986.21.11.0631
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CHEN Kai，LIU Qimeng，LIU Yu，et al. Hydrochemical characteristics and source analysis of deep groundwater in Qianyingzi Coal Mine[J]. Coal Geology & Exploration，2022，50(8)：99−106. DOI: 10.12363/issn.1001-1986.21.11.0631
Citation: CHEN Kai，LIU Qimeng，LIU Yu，et al. Hydrochemical characteristics and source analysis of deep groundwater in Qianyingzi Coal Mine[J]. Coal Geology & Exploration，2022，50(8)：99−106. DOI: 10.12363/issn.1001-1986.21.11.0631
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钱营孜煤矿深部地下水水化学特征及来源解析

Hydrochemical characteristics and source analysis of deep groundwater in Qianyingzi Coal Mine

    摘要
  • 摘要: 我国浅部煤炭资源已逐渐枯竭，在煤炭进入深部开采的条件下，来自煤层底板高承压灰岩水的威胁也越来越大，深入理解矿区含水层中水化学组成控制机制是针对性地开展水害防治工作的重要科学前提。为了查明安徽钱营孜煤矿深部地下水中常规离子的定性与定量来源，通过多种数理统计方法(包括相关性分析和R型聚类分析)、离子比值法和Unmix模型对22个灰岩水中常规离子浓度进行了分析。结果表明，地下水呈中至弱碱性，溶解性总固体(TDS)变化范围为1 945~5 292 mg/L，阳离子平均质量浓度由大到小排序为：Na+ (718 mg/L)、Ca2+ (270 mg/L)、Mg2+ (153 mg/L)，阴离子平均质量浓度由大到小排序为：SO4 2− (2 305 mg/L)、HCO3 − (239 mg/L)、Cl− (186 mg/L)，95%样品的水化学类型为SO4-Na型。相关性分析、聚类分析和离子比值分析表明，含水层中水化学组成控制因素主要为硫酸盐和碳酸盐矿物的溶解(源1)以及盐岩的溶解和硅酸盐矿物的风化(源2)。Unmix模型显示源1和源2对地下水中常规离子浓度的平均贡献率分别为56%和44%，其中，源1对Ca2+、Mg2+、Na+和SO4 2−浓度贡献率依次为73%、68%、63%和73%，源2对Cl−和HCO3 −浓度的贡献率分别为75%和66%。研究成果可为相似条件煤矿突水水源的精准识别提供理论支持。

     

    Abstract: The shallow coal resources in China have been gradually depleted. Under the condition that the deep coal exploitation has been started, the threat from the high-artesian limestone water at the coal seam floor is greater. Deep understanding of the hydrochemical composition control mechanism in the aquifer of the mine area is an important scientific precondition for pertinently carrying out water hazard prevention and control. In order to find out the qualitative and quantitative sources of the conventional ions which in the deep ground water of the Anhui Qianyingzi Coal Mine, the 22 conventional ion concentrations in limestone water were analyzed through multiple mathematical statistics methods (including correlation analysis and R cluster analysis), the ionic ratio method and Unmix model. As indicated by the results, the ground water was medium to weak alkaline. The change range of the total dissolved solids (TDS) was 1 945 mg/L to 5 292 mg/L. Cations can be sequenced by their average mass concentrations (from the larger to the smaller) as: Na+ (717 mg/L), Ca2+ (270 mg/L) and Mg2+ (153 mg/L). Anions can be sequenced by their average mass concentrations as: SO4 2− (2 305 mg/L), HCO3 − (293 mg/L) and Cl− (186 mg/L). The hydrochemical type of 95% samples was SO4-Na. As indicated by the correlation analysis, cluster analysis and ionic ratio analysis, the hydrochemical composition control factors in the aquifer were mainly the dissolution of sulfate and carbonate minerals (source 1) as well as the dissolution of salt rock and the weathering of the silicate mineral (source 2). As shown in the Unmix model, the average contribution rates of the source 1 and source 2 to the conventional ion concentrations to the ground water were 56% and 44% respectively. The contribution rates of source 1 to the concentrations of Ca2+, Mg2+, Na+ and SO4 2− were 73%, 68%, 63% and 73%, respectively. The contribution rates of source 2 to the concentrations of Cl− and HCO3 − were 75% and 66%, respectively. The study results can provide theoretical support for the accurate identification of the water bursting source in the coal mine with the similar conditions.

     

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