苏锡常地区深层地下水化学特征及成因探讨  

Discussion on the hydrochemical characteristics and genesis of deep groundwater in Suzhou-Wuxi-Changzhou area

作　　者：李月 李洋 周盈 黄晓燕[1,2] LI Yue;LI Yang;ZHOU Ying;HUANG Xiaoyan(Geological Survey of Jiangsu Province,Jiangsu Nanjing 210049,China;Key Laboratory of Earth Fissures Geological Disaster,Ministry of Natural Resources,Jiangsu Nanjing 210049,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210049 [2]自然资源部地裂缝地质灾害重点实验室,江苏南京210049

出　　处：《上海国土资源》2024年第4期171-178,202,共9页Shanghai Land & Resources

基　　金：江苏省地质勘查项目“江苏省地下水地质环境动态监测(2021―2025年)”(苏财资环[2021]46号)。

摘　　要：深层地下水是支撑苏锡常地区经济发展的重要水源,研究其水化学特征及成因,对水资源管理及生态环境保护具有重要意义。本文在78眼监测井野外样品采集和分析测试的工作基础上,综合运用统计分析、Piper三线图、Gibbs图、离子比值关系以及因子分析等多种方法,对苏锡常地区深层地下水的化学特征及其成因进行了深入探讨。结果表明:研究区深层地下水主要为弱碱性淡水,HCO_(3)^(-)和Na^(+)为主要优势阴阳离子,水化学类型以HCO_(3)^(-)Na、HCO_(3)^(-)Na·Ca、HCO_(3)^(-)Ca·Na和Cl·HCO_(3)^(-)Na为主;研究区深层水中HCO_(3)^(-)含量全区均较高,Na^(+)+K^(+)和Cl^(-)含量在北东部地区较高,其他地区较低,Ca2+和Mg2+含量东西部高、中部低,SO_(4)^(2-)含量整体较低;水化学组分主要来源于硅酸盐矿物的风化和溶解,其次是碳酸盐及蒸发盐矿物的风化溶解;水化学特征主要受溶滤作用和离子交换作用的共同影响,同时也受到一定的生物地球化学作用的影响。Deep groundwater is an important source of water to support the development of Suzhou-Wuxi-Changzhou area.Studying its hydrochemical characteristics and origin is of great significance for water resource management and ecological environment protection.Based on the water sample collection and analysis testing of 78 monitoring wells,this article comprehensively uses methods such as mathematical statistics,Piper diagram,Gibbs diagram,ion ratio relationship,factor analysis,etc.to discuss the hydrochemical characteristics and origin of deep groundwater in the Suzhou-Wuxi-Changzhou area.The results indicate that the deep groundwater in the study area is mainly weak alkaline and fresh water,the dominant anions and cations are HCO_(3)^(-)and Na^(+),and the chemical types of deep groundwater are mainly HCO_(3)^(-)Na、HCO_(3)^(-)Na·Ca、HCO_(3)^(-)Ca·Na and Cl·HCO_(3)^(-)Na.The content of HCO_(3)^(-)is higher in the entire area,the content of Na^(+)+K^(+)and Cl^(-)in the deep groundwater of the study area is higher in the eastern region and lower in other areas,the content of Ca2+and Mg2+is higher in the eastern and western regions and lower in the central region,and the overall content of SO_(4)^(2-)is relatively low.The ions in deep groundwater mainly originated from the weathering and dissolution of silicate minerals,followed by the weathering and dissolution of carbonate and evaporite minerals.The hydrochemical characteristics of deep groundwater are mainly controlled by lixiviation and cation exchange,additionally,it is also influenced by certain biogeochemical processes.

关 键 词：深层地下水 水化学特征 成因分析 苏锡常地区 

分 类 号：P641.3[天文地球—地质矿产勘探]