有效视电阻率在音频大地测量数据二维反演中的应用

APPLICATION OF EFFECTIVE APPARENT RESISTIVITY IN TWO-DIMENSIONAL INVERSION OF EH-4 DATA

用EH-4仪器进行音频大地电磁测量,目前已取得了广泛的应用。然而,进行资料的二维反演时,遇到了在大地电磁测深中同样的问题:TE极化模式和TM极化模式不容易辨别。文章介绍了3种有效视电阻率,研究表明,利用有效视电阻率进行二维反演能准确真实的反映地下的介质模型。经实际资料处理证明,此方法效果明显。

Continuous conductivity imaging system of EH -4 for magnetotelluric sounding is used widely. However, two-dimensional inversion of EH-4 data has a problem. It is difficult to make distinguish TE and TM mode which is existed in magnetotelluric sounding. Three effective apparent resistivities are introduced. It is shown that that effective apparent resistivity for two - dimensional inversion can really reflect geo - electric model, and can remove static shift. This method is proved effectively during data processing in practice.