STUDY ON THE SIMULATION OF MAGNETOTELLURIC STATIC EFFECT

With analysis on the effect of parameters such as model width, thickness, depth and resistivity on apparent resistivity and apparent phase by numerical simulation, it is found that the TM mode is seriously affected by static effect. The static distortion caused by anomalous bodies increases while the burial depth becomes shallow. The distortion caused by surface anomaly is particularly serious. The greater the resistivity difference between the anomaly and wall rock is, the more obvious its static effect is. Compared to thickness, the change of anomaly width has a greater effect on apparent resistivity. The correlation function between the parameters and apparent resistivity based on curve fitting is used to estimate the influence of anomalies on resistivity for the purpose of correction.