基于反向水文地球化学模拟的矿区地下水水化学演化机制研究  

Research on hydrochemical evolution mechanism of groundwater in mining area based on reverse hydrogeochemical simulation

作　　者：王紫剑 王虎 邓时强 WANG Zijian;WANG Hu;DENG Shiqiang(North China Engineering Investigation Institute Com pany Limited,Shijiazhuang 050021.China;Technology ImnovationCenter for Grondrwater Disaster Prevention and Control Enginering for Metal Mines Ministry of Natural Resources,Shijiazhuang 050021,China;No.5 Geological Survey Party,Tibet Autonomous Region Geological and Mineral Exploration and Development Bureaxu,Golmud816099,China)

机构地区：[1]华北有色工程勘察院有限公司,河北石家庄050021 [2]自然资源部金属矿山地下水灾害防治工程技术创新中心,河北石家庄050021 [3]西藏自治区地质矿产勘查开发局第五地质大队,青海格尔木816099

出　　处：《建井技术》2023年第6期58-62,共5页Mine Construction Technology

摘　　要：采用离子比例系数法分析了西藏某矿区地下潜水在2个不同水流方向上的水化学成分特征,并结合矿区含水层岩性,确定水文地球化学模拟过程中应加入的矿物组分;采用PHREEQC软件对矿区地下水2种不同径流方向上发生的水文地球化学反应进行识别,模拟结果表明:沿地下水路径1,从荣那沟上游至中游,发生了石膏、钠长石、钾长石的沉淀,钙长石的溶解以及阳离子交替吸附作用;沿路径2,从矿区东北侧至荣那沟,发生了石膏、岩盐、白云石、钠长石的沉淀,钾长石、钙长石、黄铁矿、赤铁矿的溶解,以及阳离子交替吸附反应。本次对矿区地下潜水水化学演化机制的研究,对分析影响西藏地区地下水水文地球化学演化规律具有重大意义。The ion proportional coefficient method was used to analyze the hydrochemical compositioncharacteristics of the phreatic water in the two different directions of the flow in a mining area in Ti-bet.Combined with the lithology of the aquifer in the mine area,it was determined that mineral com-ponents should be added to the hydrogeochemical simulation process.PHREEQC software was used toidentify hydrogeochemical reactions in two different runoff directions of groundwater in mining areas.Simulation settlement showed that along the groundwater path1,from the upstream to the middlereaches of Rongna Trench,the precipitation of gypsum,sodium feldspar and potassium feldspar,thedissolution of calcium feldspar and alternating adsorption of cation sorption had occurred.Along thepath2,from the northeast side of the mining area to Rongna Trench,the precipitation of gypsum,rock salt,dolomite and sodium feldspar,the dissolution of potassium feldspar,calcium feldspar,pyrite and hematite,and cation alternating adsorption reactions occurred.This study of the chemical evolution mechanism of phreatic water in mining areas is of great significance for the analysis of thelaws affecting the hydrogeochemical evolution of phreatic water in Tibet.

关 键 词：PHREEQC 水文地球化学演化 水文地球化学模拟 水-岩作用 

分 类 号：P641.3[天文地球—地质矿产勘探]