广域电磁法中垂直磁场分量的分析与应用  

The analysis and application of the vertical magnetic component in wide field electromagnetic method

作　　者：陈卫营[1] 薛国强[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《物探与化探》2015年第2期358-361,共4页Geophysical and Geochemical Exploration

基　　金：国家重点基础研究发展计划(973计划)(2012CB416605);国家重大科研装备研制项目(ZDYZ2012-1-05-04)

摘　　要：接地导线源产生的频率域垂直磁场具有对地层敏感、垂向分辨率高、高阻穿透能力强、随收发距增大信号衰减迅速的特点。在接地条件较差、地形起伏很大的区域,测量水平电场和水平磁场的传统CSAMT工作方式不易实现,而测量垂直磁场是一种有效的测深方式。笔者从广域电磁法的原理出发,首先对频域垂直磁场的特性进行了分析,然后利用迭代法求取适用于全场区的视电阻率;将这种测量垂直磁场的广域电磁法工作方式应用于某冻土层地区的金属矿探测,取得了很好的效果。The vertical magnetic component caused by a grounded wire source is sensitive to the earth and decays sharply with the increase of transmitting-receiving distance. It is very difficult to conduct the conventional CSAMT method which measures horizontal electric and magnetic components when the earth is hardly conductive or the topography is very steep. Measuring the vertical magnetism is an effective alternative. Based on the theory of wide field electromagnetic method,the authors analyzed the characteristics of vertical magnetic component and obtained full-zone apparent resistivety by using the method of iteration. This survey mode was applied to mineral deposit detection in a frozen ground area,with good result achieved.

关 键 词：广域电磁法 垂直磁场 分辨能力 收发距 视电阻率 冻土层 

分 类 号：P631[天文地球—地质矿产勘探]