Research on determining permeability with induced polarization relaxation spectra

Induced polarization relaxation is a function of pore size. The singular value decomposition algorithm is used to inverse the induced polarization multi-relaxation data of rock samples. The relaxation spectrum is smoothly and shows a multi-peak shape. The influence of electrolytes on the spectra results from difference of diffusion constants. Spectra shift left with increasing the constant. In addition, the relationship between relaxation spectra and permeability is also investigated by combining the core porosity, permeability and formation factor. The results show that IP relaxation related to the reservoir permeability logK has linear relationship to log(T~(1/2 )_g/ F) and log(T_(g) /F).