Spectral induced-polarization parameters as determined through time-domain measurements

Abstract

A method for the extraction of Cole?Cole spectral parameters from time-domain induced polarization data is demonstrated. The instrumentation required to effect the measurement and analysis is described. The Cole?Cole impedance model is shown to work equally well in the time domain as in the frequency domain. Field trials show the time-domain method to generate spectral parameters consistent with those generated by frequency-domain surveys. This is shown to be possible without significant alteration to field procedures. Cole?Cole time constants of up to 100 s are shown to be resolvable given a transmitted current of a 2 s pulse time. The process proves to have added usefulness as the Cole-Cole forward solution proves an excellent basis for quantifying noise in the measured decay.