抽水试验影响半径的α读数和自然电位特征  

Characteristics ofαreadings and spontaneous potential and their relationships with influence radius of pumping test

作　　者：卢放[1] 刘伟朋[1] 胡文广[1] 罗旋 LU Fang;LIU Weipeng;HU Wenguang;LUO Xuan(Center for Hydrogeology and Envirormental Geology Survey,Baoding 071051,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心

出　　处：《南水北调与水利科技》2019年第6期163-169,共7页South-to-North Water Transfers and Water Science & Technology

基　　金：国土资源部地质调查项目(DD20160240)~~

摘　　要：确定潜水完整井单井抽水试验的渗透系数和影响半径,对潜水资源调查工作具有重要意义。依据水文地质资料,使用库萨金公式粗略计算了顺平县某单井的影响半径,分析了该井的α读数和自然电位特征,并利用抽水试验的观测井资料验证了α读数和自然电位与影响半径之间的对应关系。结果表明:α读数和自然电位与抽水试验影响半径之间存在一定的对应关系,两者在抽水井处出现最大值,而从抽水井向影响半径边缘处其值逐步下降,最后接近自然背景值;潜水完整井稳定抽水试验中常用的库萨金公式准确度较低,使用α读数和自然电位来获取影响半径,其结果可靠,在条件类似的中、细砂潜水含水层分布区具有可推广性。It is of great significance to determine permeability and influence radius of pumping test from a single complete submersible well in arid area,which was roughly calculated from Kuzagin formula with Hydrogeologic data at the Shunping County in this study.Characteristics ofαreadings and spontaneous potential of the well were investigated,and then well observations were used to verify the relationship amongαreadings,spontaneous potential and the influence radius.The results showed that there was a close relationship amongαreadins,spontaneous potential and influence radius.The maximum value ofαreadings and spontaneous potential appeared at the spot of pumping well.These two parameters decreased gradually from the spot of pumping well to the edge of influence radius,and at last these two values approached background level of original water table.The accuracy of Kusagin formula,which is commonly used in steady pumping test of complete submersible well was poor.Theαreadings and spontaneous potential were then used to obtain the influence radius,and the result was reliable.It was a representative example in middle and fine sand aquifers with similar conditions.

关 键 词：抽水试验 影响半径 渗透系数 α读数 自然电位 

分 类 号：P641[天文地球—地质矿产勘探]