跨孔电阻率CT不同装置视电阻率响应分析

Sensitivity Imaging Analysis of Cross Hole Resistivity CT

跨孔电阻率CT法可以有效减小体积效应和地形影响,越来越多的人对其进行研究、试验,但在工程应用方面仍较少。本文通过设置低阻、高阻2种地质模型,对二极、三极和四极装置进行正演计算,通过对视电阻率值响应曲线形态、幅值分析,得出跨孔电阻率CT测量,四极装置测量成果较二极、三极装置好;二极装置视电阻率值计算中电流密度起主要作用,三极、四极装置视电阻率值计算中电阻率起主要作用。

The distribution in the process of cross hole resistivity in CT hole measurement sensitivity, the field data collection, data processing and interpretation will play an important role in understanding the acquisition data, the spatial sensitivity distribution can obtain better quality and more accurate data interpretation. Because it is difficult to show the relationship between the distribution of the actual resistivity with the true resistivity, this paper uses the method of numerical simulation, using the homogeneous model, the Sensitivity analysis of imaging, diode and triode and quadrupole device in different measuring electrode distance under the condition of positive and negative sensitivity of regional distribution and different characteristics, guidance for data processing and explanation.