Forward Simulation and Analysis of 2D Magnetotelluric Method for Hidden Structures

Abstract

Abstract: Because of the complexity of hidden geological structures and their apparent resistivity’s convergent rate of magnetotelluric (MT) method to true resistivity having influence on simulation precision, this paper makes the forward simulation of impedance phase and apparent resistivity of MT method for hidden faults. The finite element method is used to simulate hidden faults’MT anomalies.The apparent resistivity and impedance phase of models are calculated, and then the forward modeling results of transverse electric mode and transverse magnetic mode are analyzed. The simulation results show that the impedance phase is less than 45° when resistivities decrease with depth, and the impedance phase is bigger than 45° when resistivities increase. Also, the impedance phase can represent the electric characteristics of underground media, and its sensitivity is higher than the apparent resistivity. At the same time, the type of hidden geological structure can be distinguished from pseudo?sections of impedance phase

CLC Number:

TE112.4

YANG Tianchun1, WANG Yanlong2, FENG Jianxin1,WANG Shidang1, ZHANG Hui1. Forward Simulation and Analysis of 2D Magnetotelluric Method for Hidden Structures[J]. , 2013, 34(6): 1-1.

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Forward Simulation and Analysis of 2D Magnetotelluric Method for Hidden Structures

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