层状大地频率域接地单电极激发的电磁场  

Electromagnetic fields excited by single grounded electrode in frequency domain on the layered earth model

作　　者：徐志锋[1] 胡文宝[1] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北荆州434023

出　　处：《煤田地质与勘探》2013年第3期64-67,共4页Coal Geology & Exploration

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB209607);国家自然科学基金项目(40727001;44704073)

摘　　要：为探讨单电极在层状大地模型上激发的电磁场形成的异常形态,给出了频率域单电极电流源在层状大地上激发的电磁场表达式。采用数字滤波算法计算了频率域单电极电流源在层状大地上激发的电磁场。结果表明,单电极电流源激发的电场形态简单,能够很好地反应地电结构,磁场形态复杂;采用电磁场定义的视电阻率,在二层模型上,曲线在高频、大收发距时,趋于第一层的电阻率,在低频、大收发距时,趋于第二层的电阻率。To investigate the form of electromagnetic field stimulated by single electrode in layered ground model this paper gave the expression of the electromagnetic fields in frequency domain in layered earth excited by single electrode, and then those electromagnetic fields are calculated by digital filtering method. The results show that curve pattern for electrical field is simple and indicates the earth structure well; the curve pattern for magnetic field is very complex. The apparent resistivity is defined by electromagnetic fields. On the model of two layers, the re- sistivity curve approaches to the resistivity of the first layer in the high frequency and at large distance and to the resistivity of the second layer in the low frequency and at large distance.

关 键 词：频率域 层状大地模型 单极电流源 

分 类 号：P631[天文地球—地质矿产勘探]