煤田地质与勘探2023，Vol.51Issue(11)：74-82,9.DOI:10.12363/issn.1001-1986.23.04.0177
淮南阜东矿区二叠系砂岩高盐地下水低硫酸盐特征及成因机制
Characteristics and genetic mechanism of low sulfate in high-salt groundwater of Permian sandstone in Fudong mining area,Huainan
摘要
Abstract
Hydrogeochemistry research of groundwater in coal mining areas is of great significance to the prevention and control of mine water and the comprehensive utilization of water resources.In terms of the low surfate of Permian sand-stone water in Fudong mining area,Anhui Huainan Coalfield,the hydrochemical characteristics,water-rock interaction and low sulfate genesis of sandstone water were studied through water sampling and test by multivariate statistical meth-od,in combination with the hydrogeological condition analysis and the sulfur and oxygen isotope technology.The res-ults show that the Permian sandstone water in the study area is weakly alkaline,with an average TDS of 1 842.35 mg/L,which belongs to brackish water.The main hydrochemical types are Cl-Na type,HCO3-Na type and Cl·HCO3-Na type.The average concentration of SO42-is 37.48 mg/L,which is significantly lower than that Permian sandstone water in the eastern Panxie mining area of Huainan Coalfield and Huaibei Coalfield.The main water-rock interaction is evaporite(chloride and sulphate rock)and silicate minerals dissolution,with the alternating adsorption of cations.The Permian sandstone aquifer is a closed to semi-closed hydrogeological unit formed by the surrounding relative water-blocking boundary,which is cut by the boundary water-blocking fault.The aquifer is deeply buried,with weak water yield,poor hydrodynamic conditions and strong sulfate reduction environment,which is conducive to sulfate bacteria reduction.This results in obvious sulfate reduction,high δ34S and low sulfate content in the sandstone water.The research results could provide a basis for identifying the water inrush source in mining areas with similar conditions.关键词
淮南阜东矿区/煤系砂岩水/低硫酸盐特征/硫氧同位素/硫酸盐还原作用Key words
Fudong mining area of Huainan coalfield/coal-measure sandstone water/low sulfate characteristics/sulfur-oxygen isotope/sulfate reduction分类
天文与地球科学引用本文复制引用
姜春露,黄文迪,傅先杰,郑刘根,程世贵,单崇磊..淮南阜东矿区二叠系砂岩高盐地下水低硫酸盐特征及成因机制[J].煤田地质与勘探,2023,51(11):74-82,9.基金项目
安徽省教育厅重点项目(KJ2021A0085) （KJ2021A0085）
中煤新集能源股份有限公司科技项目(K160139183) （K160139183）
