增加频率点数提高MT的反演效果

Improving the Effect of MT Inversion by Increasing the Number of Frequency

在大地电磁测深中,目前基本上使用40个频率点的数据。对比分析了采用80个频率点与采用40个频率点的大地电磁测深结果。通过对趋肤深度分析以及对理论模型响应的计算,得到了80个频率点与40个频率点的大地电磁测深响应曲线。分别对理论曲线进行了反演。结果表明,80个频率点数据反演的精度更高,效果更好,对解释更有利。因此,今后应用大地电磁测深方法时,应提倡使用80个频率点的方案,逐渐淡出40个频率点的方案。

In the process of MT depth measurement,frequencies with 40 numbers are basically used at present.The result of measurement with 40 number frequency is compared with that of 80 number frequency.Through analysis on skin depth and calculation of the responses of a theoretical model,the MT response curves for 40 number and 80 number frequencies are obtained.The theoretical curves are reversed respectively.The results show that the data of 80 number frequency is more accurate with better effect,and it is more beneficial for interpretation.Thus 80 number frequency shall be used in future application of MT method.