EMAP处理方法在MT静校正中的应用

Application of EMAP Method to MT Static Shift Correction

在大地电磁勘探中,当地下近地表出现电性不均匀体时,使相邻测点的视电阻率发生较大变化,在视电阻率断面图上会出现虚假的陡立深大断裂或垂向大延深的异常体,产生静态效应。为解决大地电磁中静态效应所带来的影响,本文采用EMAP处理方法,通过对在测点距、测线长度和滤波系数不同情况时的MT正演模拟数据进行处理,获得了较好的效果,进而证明EMAP处理方法对静态效应校正的有效性。

In MT, when the underground near- surface has inhomogeneous block, big changes will take place in apparent resistivity among adjacent points. There will he false vertical deep fault or vertical large deep abnormal body, which is called static shift. To solve the problem from the static shift in MT, in this paper, it adopts the EMAP method to process the forward modeling data of the different situations such as point spacing, the length o{ measuring line and filter coefficients. It achieves a good result.