The Definition of Full-domain Apparent Resistivity Based on Air-ground Transient Electromagnetic Data
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摘要: 介绍了一种快速有效的瞬变电磁地空系统全域视电阻率定义方法。利用磁场垂直分量与水平分量的时间域响应定义地空系统全域视电阻率,实现全空间、全时域视电阻率定义。通过深入分析均匀半空间中地空系统的电磁场表达式,发现地空系统的时间域磁场响应可以用与地面类似的多项式表示,利用视电阻率平移算法,实现全域视电阻率定义。理论模型计算表明,该算法无需迭代,速度快且精度高。最后,对比分析了磁场强度法与感应电动势法定义视电阻率对于异常体的分辨能力。Abstract: A fast and efficient numerical calculation method of full?domain apparent resistivity for AGTEM has been developed in this paper. We defined the full-domain apparent resistivity using the vertical and horizontal component of time domain magnetic field, in this way we can achieve full space, all time domain apparent resistivity definition. We analyzed thoroughly the Air?ground transient e?lectromagnetic field analytic expression in homogeneous half space, and discovered that the Air?ground time domain response can be ex?pressed in similar polynomial with the central vertical response, use the apparent resistivity translation algorithm, we can achieve full?domain apparent resistivity definition. Model calculation results show that the apparent resistivity definition method does not require iter?ative, with quicker speed and higher precision. Finally, compared the magnetic field and the voltage based apparent resistivity for reso?lution of abnormal body.
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