大地电磁一维连续介质反演的曲线对比法

根据电磁波的传播特性，把视电阻率随周期变化的曲线转化为电阻率随深度变化的曲线，并以此作为初始反演的地电模型．通过初始地电模型得到的视电阻率曲线与真实模型的视电阻率曲线的对比，对初始地电模型的电阻率值进行校正．校正后的反演模型的视电阻率曲线与真实模型的视电阻曲线的拟合程度有所提高．然后如此反复进行多次校正，获得与真实模型更为接近的反演模型，反演的拟合误差一般小于ｌ％．模型试验和实际例子表明，该方法的拟合程度优于Ｂｏｓｔｉｃｋ法．

THE CURVE COMPARISION METHOD OF MT INVERSION FOR ONE-DIMENSIONAL CONTINUOUS MEDIUM

This paper presents a new method of inversion for one-dimensional magnetotelluric data.According to the characteristic of the MT diffusion,the curve of apparent resitivity-period is transformed into the curve of resistivity-depth,which is taken as the primary model.Then,we correct the resistivities of this model by comparing the curve of apparent resistivities calculated from this primary model with that from the true model.The apparent resistivity curve calculated from the corrected model is more fitting with the cruve from the true model.Repeating this correcting process,we obtain the final inversion model which more close to true model.The model tests and practical examples show that,the results of inversion by this method will be better than that by Bostick method.