三维断层模型的MT正演响应及极化模式分析

An Analysis of MT Forward Modeling and Different Polarization Modes in 3D Fault Model

从三维断层地质体MT的正演响应出发,通过两条测线不同极化模式的对比分析,得出了断层MT响应的正演规律:TE极化模式纵向分辨率比TM极化模式要高;横向分辨率上TM极化模式比TE极化模式分辨率高,对模型有更高的识别度和灵敏度,能更好地反应断层构造形态上的电阻率差异;通过两条测线的对比分析可判断出断层走向和倾向,对今后MT中的断层识别,起到一定的指导作用。

Three-dimensional magnetotelluric sounding positive and negative speech technology is leading edge research in geophysical exploration field.The theoretical research is not deep enough.This study starts from MT forward response about three-dimensional structure of fault,by analyzing the difference between the different polarization modes of two lines.I draw the following conclusions：firstly,TM mode’s transverse resolution has a higher resolution than TE mode,and then I know TMmode is higher than the TE mode in the model identification and sensitivity.We can get the trend and tendency of the faults by comparing the response results of the two lines. These conclusions can play a guiding role in Fault identification in the MT in latterly study.