滇中红层膏盐溶蚀特征及其对水质的影响——以楚雄谢家河河谷为例  

Dissolution characteristics of gypsum salt in the red beds of central Yunnan Province and their effects on groundwater quality:A case study of Xiejiahe valley in Chuxiong City

作　　者：黄胜东 赵龙 黄贵任 陈积普[2] 王宇 HUANG Shengdong;ZHAO Long;HUANG Guiren;CHEN Jipu;WANG Yu(Yunnan Research Institute for Geological Engineering Survey and Design Co.,Ltd,Kunming,Yunnan 650041,China;School of Architectural Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500,China)

机构地区：[1]云南地质工程勘察设计研究院有限公司(一水),云南昆明650041 [2]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《中国岩溶》2022年第4期610-622,共13页Carsologica Sinica

基　　金：“十四五”国家地下水环境质量考核项目:国家及省级污染防治专项资金(JSKTC-20210102)(合同编号:4532300HT202100029)。

摘　　要：滇中红层多含有石膏、岩盐等可溶盐矿物,在可溶盐富集地段,地下水往往表现为咸水或微咸水而不适宜饮用。文章以楚雄市谢家河河谷为例,基于钻探、物探、测井、水质分析等综合勘察资料,研究红层膏盐在地下水循环中的溶蚀特征并分析膏盐溶蚀对水质的影响。结果表明:膏盐溶蚀形式主要为散点状膏盐的溶蚀孔洞和裂隙状石膏的溶蚀裂隙,溶蚀强度主要受控于含水介质孔隙发育程度和地下水循环速度;浅层地下水循环速度快,虽可溶盐溶蚀强烈,但对地下水水质影响较弱,水质超标面较小;深层地下水循环速度慢,可溶盐溶蚀后富集于深层承压含水层中,导致地下水水质超标面大;断裂及其影响带导水造成深层承压水向浅层地下水越流,导致浅层地下水水质变差。Red beds in central Yunnan Province are mainly deposited of continental red clastic rocks.Soluble salts in the red beds are enriched in some sections,generating undrinkable salt water or brackish water.Besides,during water resources exploitation,the improper design and construction of water supply drilling will often lead to serial pollution of groundwater or the formation of inferior wells,affecting the project benefit and safety of water supply.To explore dissolution characteristics of gypsum salt in the red beds of central Yunnan and their effect on groundwater quality,a representative area of Xiejiahe Valley in Lucheng Town of Chuxiong City was selected in this study.Comprehensive survey methods such as geological survey,mapping and drilling were used to analyze lithology,geological structures,aquifers,groundwater types,classification and distribution and dissolution characteristics of gypsum salt in the study area.Based on indicators of sulfur isotope(δ^(34)S),concentration and TDS of groundwater,the groundwater quality was studied and the effect of gypsum salt dissolution on groundwater was analyzed.The Quaternary loose sedimentary layer(Qp^(al)),early Cretaceous Puchanghe formation(K_(1)p)mudstone intercalated with sandstone,and Gaofengsi formation(K_(1)g)sandstone intercalated with mudstone compose the main strata in the study area.Groundwater media types include pore water of loose layer,bedrock fissure water and karst water.Bedrock fissure water is composed of weathering fissure water,interlayer fissure water and structural fissure water.Pore water of loose layer and weathered fissure water constitutes a shallow circulation of groundwater with fast circulation speed.The deep circulation system is mainly composed of interlayer fissure water with pressure and slow circulation speed.The Yi-gan fault(F8),mainly containing vein fissure water,runs through the whole study area.Associated structures developed near monitoring wells lead to water diversion in this section of the fault.There are two types of gyps

关 键 词：滇中红层 膏盐 溶蚀特征 地下水循环 断层 水质 

分 类 号：P642.25[天文地球—工程地质学]