激发极化法的测量精度及其对应用的影响

MEASUREMENT PRECISION OF INDUCED POLARIZATION METHOD AND ITS EFFECT ON APPLICATION

本文在频率域和时间域激电二者等效的前提下，研究了在保证激电响应参数达到必须精度时，对电位差测量的精度要求。时间城激电对电位差的相对精度要求不高，但供电电流大，装备笨重。变频法对电位差的相对精度提出了很高的要求，在极化率低时，难于达到。双频激电由于同时测量双频电位差，电位差差值具有很高的相对精度，因而既轻便又能很好地满足精度要求。

From the prerequisite that the frequency domain IP is equivalent to time domain IP,this paper discusses the requirements for precision of potential difference measurement when the IP response parameters must attain the necessary precision. The time domain IP does not require very high relative precision of potential difference, but the supply current is large and the equipment is cumbersome. The frequency-varying method needs very high relavtive precision of potential difference, which can hardly be attained when polarizability is low.The dual frequency IP can simultaneously measure dual frequency potential differences,and the value of potential diffetepce has very high relative precision, so that it can easily and satisfactorily meet the requirement for the precision.