基于COMSOL的三点源供电直流电法超前探测技术

Advance detection technology of three-point source DC method based on COMSOL

传统单点供电电极直流电法超前探测技术对远距离异常体探测时,随着探测距离增加,信号逐渐减弱,准确度大大降低。为了解决远距离超前探测误差较大的问题,结合已有直流电法超前探测技术,将单点源供电,改为三点源供电;利用COMSOL软件进行模拟,绘制测线视电阻率曲线图,并通过SURFER绘制视电阻率剖面图。结果表明:三点源供电可以较好反映出远距离异常体位置,增加了超前探测有效距离,提高了超前探测准确度。

When the traditional single point power supply electrode DC advance detection technology is used to detect the longdistance anomaly,the signal gradually weakens and the accuracy greatly decreases with the increase of detection distance.In order to solve the problem of large error in long distance advance detection,we combine the existing DC method advance detection technology to change the power supply from single point source to three-point source,use COMSOL software to simulate,draw the apparent resistivity curve of the survey line,and draw the apparent resistivity profile through SURFER.The results show that the three-point source power supply can better reflect the location of the remote abnormal body,increase the effective distance of advance detection,and improve the accuracy of advance detection.