摘要
为了区分蒙陕深埋矿区各含水层之间的水文地球化学特征,利用无机组分、环境同位素和有机组分开展了水质综合研究,结果表明:研究区地表水和第四系水中矿化度(total dissolved solid,TDS)<500 mg/L,为HCO_(3)-Ca·Mg型水;白垩系与第四系构成一个统一的含水综合体,水中无机水质特征与第四系水接近;深部含水层受到安定组相对隔水层影响,矿化度TDS>3500 mg/L,属于SO_(4)-Na型水,表明洛河组与直罗组不存在直接的水力联系。环境同位素特征表明研究区雨水、地表水和第四系水属于现代地下水,白垩系水介于现代地下水和古水之间;深部侏罗系地下水中δD、δ^(18)O值均较低,为封闭条件较好的滞流地下水。地下水中溶解性有机质含量[总有机碳(total organic carbon,TOC)和UV254]随着含水层深度增加而逐渐降低;地表水和第四系水中主要出现了Ⅰ区和Ⅲ区的荧光峰;白垩系志丹群→侏罗系直罗组,Ⅴ区荧光峰强度有增大趋势,表明深部侏罗系直罗组含水层存在其他来源的腐殖质类溶解性有机物(dissolved organic matter,DOM)。
In order to distinguish the differences of hydrogeochemical characteristics of each aquifer in deep mining area of Inner Mongolia and Shaanxi,the comprehensive study on water quality was carried out by using inorganic components,environmental isotopes and organic matter.The results show that the total dissolved solids(TDS)concentration of surface water and quaternary water is less than 500 mg/L,which belonges to HCO_(3)-Ca·Mg type water.The Cretaceous Zhidan group is in unconformity contact with the quaternary system,and its inorganic water quality characteristic is closed to the quaternary system.The deep aquifer is affected by the relative aquifuge of Anding formation.The TDS concentration of Jurassic water generally>3500 mg/L.According to hydrochemical characteristics,there is no directly hydraulic connection between Luohe formation and Zhiluo formation.The environmental isotopic characteristics show that the rainwater,surface water and quaternary water in the study area belonged to modern groundwater,while the Zhidan group water is mixed water with modern groundwater and ancient water.TheδD andδ^(18)O values of groundwater in deep Zhiluo Formation and Yan'an formation are low,which is a stagnant groundwater with deep circulation depth and good sealing conditions before mining.The contents of dissolved organic matter(TOC and UV254)in groundwater gradually decrease with the increase of aquifer depth.The fluorescence peaks in zone I and zoneⅢmainly appeared in the surface water and quaternary water.From Cretaceous to Zhiluo formation,the intensity of fluorescence peak in area V had an increasing trend,indicating that there is humus like DOM from other sources in the deep Zhiluo Formation aquifer.
作者
刘洋
杨建
梁向阳
LIU Yang;YANG Jian;LIANG Xiang-yang(CCTEG Xi’an Research Institute, Xi'an 710054, China;Shaanxi Engineering Research Center of Mine Ecological Environment Protection and Restoration in the Middle of Yellow River Basin, Xi'an 710054, China)
出处
《科学技术与工程》
北大核心
2021年第30期12872-12878,共7页
Science Technology and Engineering
基金
中煤科工集团西安研究院有限公司创新基金(2020XAYJS05)
国家重点研发计划(2016YFC0501104)。
关键词
深埋煤田区
多层含水层
水文地球化学
综合特征
纳林河矿区
deep buried coalfield area
multilayered aquifers
hydrogeochemistry
comprehensive characteristics
Nalinhe mining area
