复杂地形高密度电法观测装置的分辨率探讨与分析

Discussion and Analysis of the Resolution of High-density Resistivity Imaging Devices in Complex Terrain

在复杂地形条件下,受围岩电性不均匀和地表起伏的影响,导致高密度电法勘探效果不佳。采用温纳装置、偶极装置、斯伦贝尔三种装置,在平坦、山脊、山谷地形进行模拟,通过模拟的电阻率,得出不同地形中适宜采取的电法观测装置。结果表明:温纳装置受地形因素影响较小;偶极装置在干扰较小时能较好地反映地下复杂地形的电性变化,但受山脊、山谷地形的影响较严重;斯伦贝尔装置探测时受地形影响较大,相对精确度和分辨率会降低。

In the conditions of complex terrains,the inhomogeneous electrical property of the surrounding rocks and the uneven ground surface make it difficult for high-density resistivity imaging devices to produce satisfiable results.Here,three devices of wenner,dipole and schlumberger were used to simulate terrains of plains,ridges and valleys. The appropriate observation devices of electrical method were obtained by analyzing and contrasting resistivity values of the simulation diagrams. The analysis results indicate that the wenner device is less affected by the terrain; under small disturbance,the dipole device can well reflect the electrical variations of underground complex terrains,but it is influenced seriously by the terrains of ridges and valleys; the detection of schlumberger device is greatly affected by the terrain with lower relative precision and resolution.