夏县热水区地下水地球化学特征分析  

Analysis of geochemical characteristics of groundwater in Xiaxian hot water area

作　　者：常姣 杨静[2,3] 穆慧敏[2,4] 黄春玲 李芸[1,2] CHANG Jiao;YANG Jing;MU Huimin;HUANG Chunling;LI Yun(Yuncheng Earthquake Monitoring Center Station,Shanxi Province 044400,China;Nation Continental Rift Valley Dynamics Observatory of Taiyuan,Shanxi Province 030025,China;Linfen Earthquake Monitoring Center Station,Shanxi Province 041000,China;Shanxi Earthquake Agency,Taiyuan 030025,China)

机构地区：[1]运城地震监测中心,山西044400 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西030025 [3]临汾地震监测中心站,山西041000 [4]山西省地震局,太原030025

出　　处：《地震地磁观测与研究》2025年第1期137-146,共10页Seismological and Geomagnetic Observation and Research

基　　金：震情跟踪定向工作任务(项目编号:2024010309);山西省地震局重点重点科研项目(项目编号:SBK-2526);中国地震局监测、预报、科研三结合课题(项目编号:3JH-202402012);山西省地震局创新团队项目:山西南部区域中短期异常与地震趋势判定研究。

摘　　要：夏县热水区地处中条山山前断裂,采集该区5个地下热水井样品,测试其地球化学成分及氢氧同位素组成,获得该区域水文地球化学特征,以期深化对该区温泉地球化学成因以及断裂带地震活动性的认识,为山西南部震情跟踪、流体异常核实和地震研判提供依据。研究结果显示,该热水区水化学类型主要为Cl-Na型,属中低温微咸热水。分析5个热水井样品离子相关性比值_(γ)Na+/_(γ)Cl^(-)、_(γ)Cl^(-)/_(γ)Ca^(2+)、_(γ)Cl^(-)/(_(γ)CO_(3)^(2-)+_(γ)HCO_(3)^(-)),确定各热水井的循环速度,其中:南山底半热水(NSD2)井水循环动力较强,浓缩程度较小,与冷水层交替程度较快,其余热水井循环速度由快到慢依次为中心站(ZXZ)、电力宾馆(DLBG)、南山底热水(NSD1)、温泉(WQJD)。利用同位素数据计算地下热水循环深度,并对夏县热水区热水成因进行分析,结果显示在独特构造部位和良好储水条件下,由大气降水经深循环、大地热流(地热增温)和岩石生热等作用加热,通过水—岩反应,在上升到地表的过程中与浅层地下冷水混合,并沿断裂上升出露地表,形成矿化度较高的温泉水;中心站热水井(ZXZ)开采量减少,地下水经深循环上升至地表过程中,与浅层地下冷水混合比例变大,导致其较周边热水井矿化度低、水温低,而水循环动力增强。The geochemical composition and hydrogen and oxygen isotope composition of 5 underground hot water wells in the Xiaxian hot water area of the Zhongtiao Mountain front fault were measured.The results show that the hydrochemical type of Xiaxian hot water area is mainly Cl-Na,which belongs to medium-low temperature brackish hot water.The analysis of the ion correlation ratio_(γ)Na^(+)/_(γ)Cl^(-),_(γ)Cl^(-)/_(γ)Ca^(2+),_(γ)Cl^(-)/(_(γ)CO_(3)^(2-)+_(γ)HCO3-)values shows that the water circulation of the five hot water wells in the Xiaxian hot spring area is relatively quick.The water circulation power of the Nanshan Bottom Semi-Hot Water(NSD2)well is the strongest,the concentration degree is the smallest,and the degree of alternations with the cold water layer is the fastest,followed by Central Station(ZXZ),Electric Hotel(DLBG),Nanshan Bottom Hot Water(NSD1),and Hot spring(WQJD).The isotope data was used to analyze the depth of underground hot water circulation.The results showed that the origin of hot water in the Xiaxian hot water area was that under the unique structural position and good water storage conditions,the precipitation was heated by deep circulation,terrestrial heat flow(geothermal warming),and rock heat generation,and then mixed with shallow underground cold water in the process of rising to the surface through water-rock reaction,and then rose to the surface along the fault,forming hot spring water with high salinity.It is analyzed that the hot water well in the central station has lower salinity,lower water temperature,and stronger water circulation power than the nearby hot water wells,which is caused by the decrease inits mining volume and the increasing mixing ratio of groundwater with shallow underground cold water during the process of rising to the surface through deep circulation.

关 键 词：夏县热水区 循环动力 盐化系数 热水成因 

分 类 号：P314[天文地球—固体地球物理学]