用TEM反演法进行MT静位移的识别和校正

对瞬变电磁(TEM)资料进行反演时, 采用观测磁场而不用视电阻率, 避免了由于TEM视电阻率定义而引起的误差, 并且由源象磁场和观测磁场之间的拟合进行反演使反演结果受非均匀性影响较小; 将反演结果构置出地电模型, 计算出它的MT曲线作为静位移校正的参考曲线, 使它用于MT静位移校正更为可靠, 同时也解决了两种电磁资料从时间域到频率域的转换问题.由此实现用TEM反演的方法进行MT静位移的识别和校正.实例表明, 这种方法对MT静位移的识别和校正十分有效. 

Judgment and correction for MT static shift by TEM inversion method

The inversion for TEMdata using the observed magnetic fields instead of using the apparent resistivities avoids the errors caused by the definition of the TEMapparent resistivity. In addition, the inversed results by fitting the magnetic fields of the transmitter source's image to those of the observed magnetic fields are relatively less affected by the conductivity inhomogeneity. The MTapparent curves calculated from the geo-electric model constructed with the TEMinversion results, serve as reference curves for the more reliable correction of MTstatic shift, and also actualize the transformation from time domain to frequency domain between these two kinds of electromagnetic data. Therefore, TEMinversion can be applied to the correction of the MT static shift. Many field studies show that this method is very effective for the judgment and correction of the MTstatic shift.