CSAMT中IP效应仿真分析与研究

Simulation analysis and study on IP effect in CSAMT

为解决CSAMT中的IP效应问题,以Cole-Cole模型作为IP效应极化模型,研究了层状介质中CSAMT的视电阻率响应,发现IP效应对视电阻率幅值和相位的影响主要发生在中低频段;从参数变化的角度分析了Cole-Cole模型各参数对视电阻率幅值的影响水平。结果表明:极化率参数和频率相关系数的影响显著水平大于时间常数的影响水平;因此,在采用CSAMT资料提取IP参数、去除CSAMT中IP效应影响时,应首先选择影响水平大的极化率参数和频率相关系数。

To solve problem of IP effect in CSAMT,using Cole-Cole model as IP effect polarization model,the apparent resistivity response of CSAMT study in layered media is studied.The results show that IP effect on amplitude and phase of apparent resistivity mainly occurs in the middle and low frequency.Effect level of Cole-Cole model parameters on magnitude of apparent resistivity is analyzed from the perspective of parameter changing.It shows that the effect level of polarizability parameters and frequency-dependent coefficient is greater than that of time constant.So when extract IP parameters from CSAMT data and remove IP effect in CSAMT should first select parameters that have great influence.