抽水组数和先验信息对估算三维非均质含水层渗透系数的影响  

Effect of Number of Pumping Tests and Prior Information on Hydraulic Conductivity Estimation of Three-Dimensional Heterogeneous Aquifer

作　　者：黄康 孙蓉琳[1] 袁淑卿 杨艺娇 蒋立群[1] Huang Kang;Sun Ronglin;Yuan Shuqing;Yang Yijiao;Jiang Liqun(School of Environmental Studies,China University of Geosciences,Wuhan 430078,China)

机构地区：[1]中国地质大学环境学院,湖北武汉430078

出　　处：《地球科学》2022年第2期689-699,共11页Earth Science

基　　金：国家自然科学基金项目(Nos.41772268,41102155)。

摘　　要：水力层析抽水实验可以高精度刻画非均质含水层渗透系数分布,但野外成本高,需要对抽水试验进行优化.通过构建三维非均质含水层砂箱,开展水力层析抽水实验,探讨不同抽水组数和先验信息对刻画渗透系数的影响.分别利用不同抽水组数和融入42个井段岩心渗透系数作为先验信息,对渗透系数场进行估算,并用以预测独立抽水实验过程,对比估算结果优劣.随着抽水组数增加,估算结果逐渐提升,再增加到8组,估算结果没有明显提升;融入先验信息后,2组抽水实验估算精度可达到无先验信息8组抽水实验估算的精度.在水力层析野外实践中,融入钻孔岩心渗透系数等先验信息,可减少抽水组数,降低试验成本.Hydraulic tomography(HT)can accurately characterize the hydraulic conductivity(K)of field heterogeneous aquifer,but the field test cost is relatively high and pumping test need to be optimized.In order to explore the effect of number of pumping tests and prior information on the K estimates,we constructed a laboratory three-dimensional sandbox with heterogeneous aquifer,and then carried out pumping tests in HT survey.The K fields are respectively estimated using HT with and without 42 K values of core samples as prior information.The estimated K fields from different cases are then used to predict non-dependent pumping tests and compare the accuracy of estimated K fields.With increasing number of pumping tests,the estimated K fields are gradually improved.When pumping tests increase to eight groups,the K estimates are not significantly improve with the increase of pumping tests.42 K values of core samples as prior information can greatly improve the K estimates in HT survey.The K obtained from only two pumping tests with prior information has almost same accuracy as the K estimates from the case of eight pumping tests without prior information.

关 键 词：水力层析 抽水组数 先验信息 室内砂箱 渗透系数 水文地质 

分 类 号：P641[天文地球—地质矿产勘探]