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在复电阻率法找矿过程中,地形对勘测结果的影响不可忽略.本文利用有限差分法二次场模拟研究了带地形的三维复电阻率正演,对求解区域采用不规则正六面体网格剖分,利用不同块体在地表之上的累加来模拟地形起伏的变化.其正演结果与积分方程法得到的结果相比较,所得结果基本一致,证明本文正演算法的可靠性和准确性.并设计了不同正演响应模型,通过对比分析正演响应结果可以得到:在低频时凹地形对视电阻率曲线影响要比高频时大,而地形对电场相位的影响在高频时更明显.
In the process of prospecting by the complex resistivity method, the influence of the terrain on the survey results can not be neglected.In this paper, the three-dimensional complex resistivity forward modeling with terrain is studied by using the second-order field simulation of the finite difference method, and the irregular hexahedral grid And the accumulation of different blocks on the ground surface is used to simulate the change of topography.Compared with the integral equation method, the results of the forward modeling are basically the same, which proves the reliability and accuracy of the algorithm In addition, different forward response models are designed, and the results of forward response are comparatively analyzed. It can be concluded that the concave topography affects the apparent resistivity curve more than the high frequency at low frequency, and the influence of topography on the phase of the electric field is more obvious.