高密度电阻率勘测方法分辨率研究与探讨

随着高密度电阻率法在工程中的应用日益广泛，对分辨率的影响因素分析研究也受到重视。论文以均匀半空间局部直立异常体为探测目标，建立多个基于温纳高密度电法装置的地电模型，采用有限元等方法进行正反演数值模拟分析，对高密度电阻率法探测分辨率的影响规律进行探讨。分析表明，地形起伏会引起异常体的位置与形态发生畸变和位移，分辨率降低； 电阻率差异增大，分辨率提高； 深径比增大，分辨率降低； 当异常体的水平范围一定时，探测分辨率随纵深的增大而提高。

ANALYSIS OF RESOLUTION INFLUENCE FACTORS OF HIGH-DENSITY ELECTRICAL METHOD AND ITS APPLICATION

In recent years, high-density electrical method have been used more and more widely and the researches on resolution influence factors analysis of the high-density electrical method have been drawn much attentions. This paper takes the partially erect anomaly of a uniform half-space as detect target, building different models to simulate and analyze with the Wenner high-density electrical device, employing 2DRES software to process forward and inverse numerical simulation and analysis to obtain the effects of the terrain, resistivity differences, depth to diameter ratio and deepening on the high-density electrical probe resolution. The results show that the undulating terrain makes the apparent resistivity anomaly location displaced, shape distorted and the resolution reduced; the detecting resolution of high-density resistivity method increases with the increase of resistivity difference; the detecting resolution decreases with the increase of depth to diameter ratio, and the detecting resolution increases with the increase of extended depth when the lateral width of certain anomalies reaching a critical level. Finally, the recommendations to improve the detecting resolution are given by combining the theoretical analysis and the engineering application.