吉林省长山水源地主要含水层野外弥散试验研究

Field Dispersion Test of Main Aquifers in Changshan Water Source Area of Jilin Province

地下水作为吉林长山镇的主要供水水源,其水质安全至关重要。而随着近些年人民生活水平的提高、工农业的发展、区内油田开采等人类活动的加剧,地下水污染问题变得越来越严峻。为保障长山水源地的正常运行以及周边人民的供水安全,本文开展了当地主要含水层(第四系潜水、第四系承压水以及新近系泰康组承压水)弥散试验,利用投源孔消散和观测孔接收两种方法计算弥散参数,并对不同含水层、不同试验方法的计算结果进行比对分析。结果表明:研究区承压含水层纵向弥散系数为0.095~0.127 m^2/d,横向弥散系数0.012~0.083 m^2/d;潜水含水层纵向弥散系数为0.323~0.419 m^2/d,横向弥散系数0.073~0.168 m^2/d。证实利用气压双栓塞可以有效解决承压含水层示踪剂投放和接收难度大的问题,并达到利用一套试验孔得到多层含水岩组弥散参数的目的。

Groundwater is used as the main source of water supply for Changshan Town,Jilin,which quality safety is of paramount importance.But in recent years,with the improvement of people's living standard,the development of industry and agriculture,and the intensification of human activities such as the exploitation of oilfields in the region,the problem of groundwater pollution has become increasingly serious.In order to ensure the normal operation of the Changshan water source and the safety of the water supply of the surrounding people,this article conducted dispersion tests of the main aquifers in the local area(Quaternary phreatic water,Quaternary confined water,and Tertiary confined water).Two methods are used to calculate the dispersion parameters,and the calculation results of different aquifers and different test methods are compared and analyzed.The results show that the longitudinal dispersion coefficient of the confined aquifer in the study area is 0.095~0.127 m^2/d,the lateral dispersion coefficient is 0.012~0.083 m^2/d;the longitudinal dispersion coefficient of the phreatic aquifer is 0.323~0.419 m^2/d,and the lateral dispersion coefficient is 0.073~0.168 m^2/d.It is proved that the use of double air pressure embolism can effectively solve the problem of the difficulty of putting and receiving the tracer in the confined aquifer,and achieve the purpose of obtaining the dispersion parameters of the multi-layer aquifer using a set of test wells.