摘要
美国的Petro-Sonde(简称PS)法,对地层有很高的分辨力和一定的识别物性的能力,从而引起我国地球物理学界的重视,国内研究者相继开展了对该方法的研究。但由于对PS法的场源机制并不清楚,这妨碍了对方法原理的研究,因而对场源机制的探讨至关重要。本文提出PS法所利用的场源是起因于雷暴闪电的天然电磁场,且主要是电型场或TM场,而TM零阶模和TM一阶模为其主要的初始场形式,这明显不同于Cagniard模型。
In this paper, the characteristic of the matiral electromagnetic field from lightning and from solar wind iis discussed when the sourse fild is considered. The studies author has performed show that (1) the resolution power (distinguishability) of using TE field to stratum subsurface decreases but TM field increases wh n source field is considered, (2) the natural field or atmospherics of wave-guides has a non-uniform field effect and (3) because of the 'cut-off' frequency of TM1 mode, according to theory analysis such situation leads to the concept of 'high resolution power window' to stratum subsurface. Author suggest that the source field PS method utilizes originates from lightning discharges (or atmospherics) and is not from solar wind, and that PS technology makes use of the speciality of the waveguide of the atmospherics.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第1期113-120,共8页
Chinese Journal of Geophysics
关键词
PS法
场源
电磁场
PS(Petro-Sonde) method, Atmospherics, TM mode.
