五分量大地电磁测深资料的处理

大地电磁测深资料的处理有四分量和五分量之分:四分量是指采集和处理都选用两个水平电场分量E_x,E_v和两个水平磁场分量 H_x,H_y;而五分量是指在水平电、磁场四分量的基础上,再加入-个垂直磁分量 H_z。众所周知,依据垂直磁场分量 H_z可以确定地层的倾向,所以五分量的处理手段较四分量的处理更加优越。本文仅对美国地质电子仪器公司 M78SRA 型大地电磁测深数字仪的配套常规处理程序 MAGTAN 的计算方法加以讨论。

The processing of five-component magnetotelluric sounding data

Magnetotelluric sounding data can be processed using four-component method or five-component method. In the four-component method,two horizontal electric components E_x, E_v and two horizontal magnetic components H_z, H_y are used in data acquisition or data processing.In five-component method,the vertical magnetic component H_z is also used besides the four horizontal electric and magnetic components.It is well known that the five-component method is superior to four-component method because the vertical magnetic compoent H_z can be applied to the determination of formation dip.The conventional processing algorithm, MAGTTAN, of US-made M78S1tA magnetotelluric sounding system is analysed in the paper.