井下地电阻率观测中装置系数的计算——以天水地震台井下观测为例  

Calculation of the Configuration Coefficient in the Deep-well Geo-electrical Resistivity Observation——Taking Deep-well Observation of Tianshui Earthquake Station as an Example

作　　者：王兰炜[1] 张世中[1] 张宇[1] 胡哲[1] 顔蕊 

机构地区：[1]中国地震局地壳应力研究所,北京100085

出　　处：《工程地球物理学报》2014年第1期50-59,共10页Chinese Journal of Engineering Geophysics

基　　金：国家自然基金面上项目(编号:41374127);中国地震局地震行业科研项目(编号:200808030);中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项(编号:ZDJ2012-04)联合资助

摘　　要：面对日趋严重的环境干扰问题,我国已有多个地震台开展井下地电阻率观测试验,以减少或消除场地中出现的各种干扰影响,这些观测试验中一般采用较短极距的四极观测装置。在四极地电阻率观测装置中,由于装置系数与电极位置及电流在空间的分布有关,因此井下地电阻率观测的装置系数不能以电极在地表的方式计算,而应针对不同的观测装置情况,以半无限空间、全空间或者不完全全空间的方式计算。本文以甘肃省天水地震台井下地电阻率观测为例,详细说明了各种不同装置情况下装置系数的计算方法,期望能为今后井下地电阻率观测提供有益的帮助。Faced with the increasingly serious environmental interference problems, several earthquake stations have adopted deep--well geo--electrical resistivity observation experi- ments to decrease or eliminate all kinds of inference of the earth. The four--electrode sym- metry configuration with short electrode distance is used in the experiments. Since the con- figuration coefficient is associated with the positions of electrodes and the distribution of e- lectric current in the four--electrode geo--electrical observation device, the calculation for the configuration coefficient in the deep--well geo--electrical resistivity observation is not the same as that of electrodes on the earth surface. It should be calculated by different methods based on the deployment of electrodes, such as full--space model, half--space model or non--full--space model method. Taking Tianshui earthquake station as an exam- ple, this paper made detailed studies on how to calculate the configuration coefficient in dif-ferent configuration, which would be helpful to the deep--well geo--electrical resistivity observation in the future.

关 键 词：地电阻率 井下观测 装置系数 全空间 

分 类 号：P631[天文地球—地质矿产勘探]