宿县矿区石炭系太灰地下水化学特征及水岩相互作用  

Hydrogeochemical characteristics and water-rock interaction of limestone groundwater of Carboniferous Taiyuan Formation in Suxian mining area

作　　者：张苗 陈陆望[2] 姚多喜[1] 张杰 ZHANG Miao;CHEN Luwang;YAO Duoxi;ZHANG Jie(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2022年第3期396-405,共10页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(41972256)。

摘　　要：石炭系太原组灰岩(简称“太灰”)地下水是宿县矿区煤层开采主要的充水水源之一,为了研究安徽淮北煤田宿县矿区石炭系太灰地下水化学特征并分析其形成机理,文章综合运用Piper三线图、Gibbs图、相关性分析、主成分分析、离子组合比及饱和指数对矿区的地下水化学特征及水岩相互作用进行分析。结果表明:石炭系太灰地下水主要阳离子为Na^(+)与Ca^(2+),主要阴离子为HCO^(-)_(3)与SO_(4)^(2-);研究区水质类型东部地区主要为HCO_(3)-Ca·Mg型或HCO_(3)-Na型,中部地区主要为SO_(4)-Na·Ca·Mg型或SO_(4)·Cl-Na型,西部地区主要为HCO_(3)-Na型或HCO_(3)·Cl-Na型;石炭系太灰地下水中发生的水岩相互作用主要包括碳酸盐、石膏和黄铁矿氧化的溶滤溶解作用及Ca^(2+)与Na^(+)的阳离子交替吸附作用;受区域地质构造的影响,宿县矿区水岩相互作用存在明显的空间差异性——东部地区以方解石和白云石溶解为主,中部地区以黄铁矿氧化和Ca^(2+)与Na^(+)的阳离子交替吸附作用为主,西部地区以Ca^(2+)与Na^(+)的阳离子交替吸附作用为主。研究结果可为华北地区深部水资源开发和保护提供依据。The limestone groundwater of Carboniferous Taiyuan Formation(referred to as Carboniferous aquifer)is one of the main water inrush sources for coal mining in Suxian mining area.In order to study the chemical characteristics and formation mechanism of Carboniferous aquifer in Suxian mining area of Huaibei coalfield,Anhui Province,the chemical characteristics and water-rock interaction of groundwater in mining area were analyzed by using Piper three-line diagram,Gibbs diagram,correlation analysis,principal component analysis,ion combination ratio and saturation index.The results show that the main cations are Na^(+)and Ca^(2+)and the main anions are HCO^(-)_(3)and SO_(4)^(2-);the water quality types are mainly HCO_(3)-Ca·Mg or HCO_(3)-Na in the eastern region,SO_(4)-Na·Ca·Mg or SO_(4)·Cl-Na in the central region,HCO_(3)-Na or HCO_(3)·Cl-Na in the western region;the main water-rock interaction in Carboniferous aquifer includes dissolution of carbonate,gypsum and pyrite oxidation,and cation alternating adsorption of Ca^(2+)and Na^(+).Influenced by the regional geological structure,the water-rock interaction in Suxian mining area has obvious spatial difference:calcite and dolomite are dominant in the eastern region,pyrite oxidation and cation alternating adsorption of Ca^(2+)and Na^(+)are dominant in the central region,and cation alternating adsorption of Ca^(2+)and Na^(+)is dominant in the western region.The research results can provide a basis for the development and protection of deep water resources in North China.

关 键 词：石炭系太原组灰岩 地下水 水文地球化学特征 水岩相互作用 宿县矿区 

分 类 号：P641.461[天文地球—地质矿产勘探]