频率测深波区视电阻率响应和正演计算

本文对频率测深电偶源发射时的波区视电阻率响应进行了较系统的讨论,指出了国内现有理论中的一些错误。研究发现,在进行波区视电阻率响应的理论推导时,当基底电阻率有限时进行零级近似是正确的,但当基底电阻率为无限大时,进行零级近似是不完善的,必须进行修改。利用正确的公式进行了视电阻率响应的正演计算,结果表明,利用零级近似得出的公式与利用一级近似得出的公式计算的视电阻率响应曲线首支部分符合较好,但对于有高阻基底存在的地电断面,响应曲线尾支差异很大。

THE RESPONSE OF APPARENT RESISTIVITY OF E.M. SOUND IN WAVE AREA AND DIRECT CALCULATION

The response of apparent resistivity of E.M. sounding in wave area is discussed systematically. Here, it also points out the errors existing in some references and the cause of making the errors. By calculation and comparison, it is found that, with different formula,the firts parst of the curve of response of apparent resistivity correspond well with each other, but in cases where the basements are of highly resistivity, great differences are seen in the last parts of the curve.