三维地电模型数值模拟中视电阻率真假异常特征分析

The Character Analysis of True and False Approximate Resistivity Anomaly in Numerical Modeling of 3-D Geo-electrical Model

本文概要介绍了三维数值模拟中双网格系统的剖分方法,并通过几种典型模型的有限单元法三维数值模拟计算(网格单元电导率分块均匀、电位三线性变化),充分揭示了对称四极电阻率测深法三维地电模型视电阻率真假异常的分布规律,分析了产生真假异常的原因,并研究了真异常的形态与引起真异常的地质体位置的关系。

This paper presents a dissection method with the double net system in the finite element method for 3-D numerical modeling of resistivity sounding.By the computation of several typical models using 3-D FEM with homogeneous conductivity and potential interpolated with a trilinear function in each block, we gave the distribution rules of true and false approximate resistivity anomaly with symmetrical four electrodes, analyzed the cause of true and false anomaly, and studied the relation both the general shape of the true anomaly and the position of geological body which produced true anomaly.