TY - JOUR A1 - Binley, A. A1 - Kruschwitz, Sabine A1 - Lesmes, D. A1 - Kettridge, N. T1 - Exploiting the temperature effects on low frequency electrical spectra of sandstone: a comparison of effective diffusion path lengths JF - Geophysics N2 - A number of recent investigations have highlighted the potential value of using relaxation times derived from electrical spectra to infer key physical properties of permeable rocks. To date, most studies have assumed a grain size or pore throat as a measure of the length scale of the ionic diffusive process, although this has been challenged in recent experimental investigations. We compare the electrical spectra of three sandstones, adopting a new approach in which the temperature of the rock samples is perturbed and the relaxation time measured as a function of temperature. Our results suggest that, for the sandstones tested here, the effective diffusion coefficient should be considered as a function of the electrical tortuosity. These findings may help explain the apparent long relaxation times observed in low-permeability rocks in recent experimental studies. We also highlight the need to account for temperature in related studies of electrical spectra. KW - Grain size KW - Porosity KW - Rocks KW - Spectral induced polarization KW - Temperature KW - Sandstone KW - Saturation KW - Diffusion PY - 2010 DO - https://doi.org/10.1190/1.3483815 SN - 0016-8033 VL - 75 IS - 6 SP - A43 EP - A46 PB - Soc. CY - Tulsa, Okla. [u.a.] AN - OPUS4-23860 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -