呼吉尔特矿区深埋含水层水文地球化学特征及其指示意义  

Hydrogeochemical characteristics of deep buried aquifer in Hujierte mining area and its implications

作　　者：刘基 LIU Ji(Xi'an Research Institute of China Coal Technology&Engineering Group Corp,Xi'an 710054;Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology in Shaanxi Province,Xi'an 710054,China)

机构地区：[1]中煤科工集团西安研究院有限公司,西安710054 [2]陕西省煤矿水害防治技术重点实验室,西安710054

出　　处：《干旱区资源与环境》2021年第1期154-159,共6页Journal of Arid Land Resources and Environment

基　　金：国家重点研发计划(2017YFC0804100);国家自然科学基金(41302214)资助。

摘　　要：为确定呼吉尔特矿区深埋含水层与上覆浅层含水层之间的水力联系,分别采集了第四系、白垩系、J_(2)a-2#、2#-3#以及3#-6#煤间含水层的地下水样品进行一般水化学、δD和δ^(18)O测试。综合采用数理统计、Piper三线图、Gibbs模型、氯碱指数以及同位素分析,确定了各含水层地下水的水文地球化学特征,判断了相邻含水层之间的水力联系程度。结果表明,呼吉尔特矿区各含水层地下水的pH基本都在7~10之间,均为碱性水。J_(2)a-2#、2#-3#及3#-6#煤间含水层地下水TDS平均值分别为713.17mg/L、2092.3mg/L和6959.73mg/L,远远大于浅层第四系和白垩系含水层地下水。第四系和白垩系含水层水化学类型分别为HCO_(3)-Ca·Na和HCO_(3)-Na;J_(2)a-2#煤含水层水化学类型为HCO_(3)·SO_(4)-Na;2#-3#煤间和3#-6#煤间水化学类型分别为SO_(4)-Na、SO_(4)-Na和SO_(4)·Cl-Na。各含水层的δ^(18)O在-5‰~-10‰之间,深埋含水层地下水的δD在-80‰~-85‰之间,浅层含水层的δD在-60‰~-75‰之间。3#-6#煤间含水层地下水成分主要受蒸发浓缩控制,J_(2)a-2#含水层和2#-3#煤间含水层地下水成分主要受岩石溶滤-蒸发浓缩控制,第四系和白垩系浅层含水层地下水成分受岩石溶滤控制。同时各含水层均发生了阳离子反交换作用。第四系和白垩系含水层有一定的水力联系,第四系、白垩系与侏罗系含水层以及侏罗系含水层之间的水力联系不密切。In order to determine the hydraulic connection between the deep-buried aquifer and the overlying shallow aquifer in the Hujierte mining area,groundwater samples of Quaternary,Cretaceous,J_(2)a-2#,2#-3#and 3#-6#coal aquifers were collected for general hydrochemistry,δD,andδ^(18)O tests.The hydrogeochemical characteristics of groundwater in each aquifer were determined by comprehensive use of mathematical statistics,Piper trilinear diagram,Gibbs model,chlor-alkali index,and isotope analysis.And the hydraulic connection degree between adjacent aquifers was comprehensively determined.The results showed that the pH value of groundwater in each aquifer in Hujierte mining area was between 7 and 10,which was alkaline water.The average TDS of groundwater in J_(2)a-2#、2#-3#及3#-6#coal aquifers were 713.17 mg/L,2092.3 mg/L and 6959.73 mg/L respectively,which was much larger than that of shallow Quaternary and Cretaceous aquifer groundwater.With the increase of groundwater depth,the main cations changed from Ca^(2+)to Na^(+),and the concentration of Na^(+)gradually increased,while the anions changed from HCO_(3)- to SO_(4)^(2-).The hydrochemical types of quaternary and Cretaceous aquifers were HCO_(3)-Ca·Na and HCO_(3)-Na,respectively.The hydrochemical type of J_(2)a-2#coal aquifer was HCO_(3)·SO_(4)-Na.The water chemistry types of 2#-3#and 3#-6#coal aquifers were SO_(4)-Na,SO_(4)-Na and SO_(4)·Cl-Na,respectively.Theδ^(18)O of each aquifer ranged from-5‰to-10‰,theδD of groundwater in deep aquifer ranged from-80‰to-85‰,and theδD of shallow aquifer ranged from-60‰to-75‰.The groundwater composition of the 3#-6#coal aquifer was mainly controlled by evaporation concentration,the groundwater composition of J_(2)a-2#and 2#-3#coal aquifer was mainly controlled by rock leaching-evaporation concentration,and the groundwater composition of the Quaternary and Cretaceous shallow aquifers was controlled by rock leaching.Meanwhile,reverse cation exchange occurred in all aquifers.There was a certain hydraulic connecti

关 键 词：水力联系 水文地球化学 水化学类型 控制因素 呼吉尔特矿区 

分 类 号：P342[天文地球—水文科学]