基于双频激电法的水槽模型实验研究

A Study of Water Tank Modeling Based on Dual-frequency IP Method

双频激电法是一种应用广泛的频率域激电法。基于双频激电法的原理和特点,使用SQ-3C双频激电仪,采用偶极-偶极的电极装置,在水槽模型中测量了不同频率以及极距分别为2.5cm、5cm和10cm在不同电流的情况下,分别在自来水和含盐度3.5%的盐水中黄铜矿标本的视电阻率和视幅频率,以此来模拟其在海水中的测量。测量结果表明电阻率法在海水中显示矿体异常不明显,而双频激电法可以很好地显示矿体的激发极化异常,使用偶极-偶极电极装置在盐水中也可以进行拖曳测量,以提高工作效率。通过实验认为,在盐水中应该增强采集仪器的微弱信号检测和放大滤波的能力,有助于激电信号的检测。

Dual-frequency IP method is a widely used frequency-domain IP method.Based on the principle and characteristics of dual-frequency IP method,the use of SQ-3C dual-frequency IP instrument in the dipole-dipole electrode device,in the sink model measured at different frequencies as well as the polar distance were 2.5cm,5cm and 10cm at different current,in the fresh water and 3.5% salinity of the brine in the chalcopyrite specimens of apparent resistivity and amplitude-frequency rate,which simulates the measurements in seawater.The results show that the ore body is not quite abnormal when the resistivity method is in sea water,while the dual-frequency IP method can show the ore body polarization abnormal.The use of dipole-dipole electrode device in the brine can also carry out drag measurements in order to improve efficiency.The experiments also show that the instrument should be enhanced to detect weak signal and amplify filtering capabilities in the brine,which will be helpful to detect IP signals.