Applied processing for calculation of TEM in-loop full-zone apparent resistivity and 1-D inversion of field transferred from dB/dt response observed directly
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摘要: 中心回线圴匀大地电动势响应(dB/dt)的解有三种:唯一解、双解及无解,若是层状大地,尚有"上凸"、 "下凹"的假异常现象,而磁场响应(Hz)则无此类情况,但若想直接观测Hz则需添加设备.本文以理论为基础,从实践经验出发,设计出一套将dB/dt转换为Hz的方案,该方法不苛求观测的最晚延时达到近带;同时,提出了求视深度的经验改正系数,以及新的高精度后沿改正法.这一套方法不仅可换算出Hz,还能求出全区视电阻率及1-D反演数据.实例表明本方法实用有效.Abstract: The voltage response(dB/dt)is wildly used in TEM in-loop configuration;nevertheless, for layered earth,it has several defects in solution, such as unique valued, dual-valued, undefined valued and overshoot and undershoot phenomena.It is hoped that field response has not these defects.So if we want to observe field response directly,SQUID or flux-gate sensor should be added.Therefore the process of transferred dB/dt should be available.Of course it has some other difficult problems in calculation, for examples: how to get the first electromagnetic field strength and applied apparent depth formula.This paper tackles those problems and has solved them.
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