点电流源直流场的三维正演模拟及可视化的初步研究

Preliminary study on 3D forward modeling and visualization of direct current field of the point electric current source

为快速获取直流电法不同三维模型参数下的视电阻率的空间分布及其变化规律,基于异常电位法实现了二极装置下的直流电阻率的三维有限差分正演算法,并基于MATLAB的GUI(Graphical User Interfaces)平台开发实现了人机交互的直流电法三维数值模拟系统,通过不同的三维模型和参数测试验证了算法的正确性和系统的可靠性。该模拟系统具有很强的算法鲁棒性,通过设置三维模型参数,可以快速多视角动态显示视电阻率空间分布,进而可以直观掌握不同三维地球物理模型的直流电法响应特征。

In order to quickly obtain the spatial distribution and change regularity of apparent resistivity under different 3D model parameters of the direct current method,this paper implements the three-dimensional finite difference forward algorithm for direct current resistivity under the two-pole device based on the anomaly potential method.On the basis of MATLAB GUI(Graphical User Interfaces)platform the three-dimensional numerical simulation system of direct current method with human-computer interaction has been developed and realized.The correctness of the algorithm and the reliability of the system are verified through different three-dimensional models and parameter tests.The simulation system has strong algorithm robustness.By setting the 3D model parameters,it can quickly and dynamically display the spatial distribution of apparent resistivity from multiple perspectives,and can intuitively grasp the direct current method response characteristics of different 3D geophysical models.