磁性源近区瞬变电磁法电阻率偏低的原因

摘要

探讨瞬变电磁法观测电阻率偏低或很大偏低于实际电阻率的原因.认为它是由供电期间供电回线与接收回线之间电场耦合产生的附加效应造成的,该效应产生的电势成为观测瞬变电势的强背景值；最后给出了减弱(或消除)这种电场干扰的方法与措施.%This paper discusses the reason why the TEM observation resistivity is lower or much lower than actual resistivity. It is caused by the additional effect of the electric field coupling between the transmit coil and the receiving coil during the time of power supply. This effect becomes a strong background values in the measurement of the transient potential. This paper gives the method and measures for eliminating (or weakening) this field interference.