关于频率电磁测深几个问题的探讨(五)——频率电磁测深中电磁场波型及意义

Analysis on electromagnentic wave mode in electromagnetic frequency sounding and its significance

引出水平分层大地面上水平电偶极源及垂直磁偶极源的电磁场分量表达式,对式中核函数进行了变换,分析所含的波型及其与场区的关系,指出了TE型场、TM型场和TEM型场穿透地层的能力。根据波型与地层作用特点,优化电磁场分量,以提高频率电磁测深的探测效果。

Electromagnetic field formulas for horizontal electric dipole and verticale magnetic dipole on layered earth are quoted. Nuclear functions in the formulas are transformed, and wave modes as well as the relations to the fied zone are analyzed. The penetration ability of TE mode,TM mode and TEM mode is indicated. According to the wave mode and feature of its effect upon strata, the electromagnetic field components are selected. Therefore, prospecting result for electromagnetic frequency sounding will be improved.