The analysis and application of the vertical magnetic component in wide field electromagnetic method
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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。Abstract: The vertical magnetic component caused by a grounded wire source is sensitive to the earth and decays sharply with the in?crease of transmitting?receiving distance. It is very difficult to conduct the conventional CSAMT method which measures horizontal elec?tric 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 miner?al deposit detection in a frozen ground area, with good result achieved.
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