相位激电法电磁耦合效应的校正

激电法广泛应用于金属矿产的勘查工作中,电磁耦合效应作为一项强的干扰因素,尤其是在低阻区或大极距测量时,很大程度上影响着探测深度和精度。文章以相位激电法中的偶极-偶极装置为例,讨论了均匀半空间下的正演方法,并模拟计算了其电磁耦合响应,针对电磁耦合效应的频率特性,使用不同频率的相位值进行近似去耦。实测激电资料的结果表明,此方法基本达到去耦效果,能清楚的反映出异常体的激电特征,对野外找矿工作具有重要意义。

The Phase-IP electromagnetic coupling correction

At present, the IP method is widely applied in the metal mineral exploration. Electromagnetic coupling effect as a strong interference factors, especially in the low-resistivity layer or large electrode spacing measurement, with a large extent influence in detecting depth and precision. This paper using dipole-dipole device as an example, discussing the forward modeling method of Phase IP under uniformity half-space, and calculating the electromagnetic coupling effect. Using phase values of different frequencies to decoupling, which is based on the frequency characteristics of the electromagnetic coupling effect. The measured IP data show that this method achieves essentially the decoupling effect, and it can clearly reflect the IP characteristics of geologic anomaly. This method is of great significance to the field work.