Journal
JOURNAL OF APPLIED GEOPHYSICS
Volume 135, Issue -, Pages 375-386Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jappgeo.2016.07.007
Keywords
Spectral induced polarization; Relaxation time; Pore-throat size; Consolidated materials; Membrane polarization; Textural controls
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There is currently a debate within the SIP community about the characteristic textural length scale controlling relaxation time of consolidated porous media. One idea is that the relaxation time is dominated by the pore throat size distribution or more specifically the modal pore throat size as determined in mercury intrusion capillary pressure tests. Recently new studies on inverting pore size distributions from SIP data were published implying that the relaxation mechanisms and controlling length scale are well understood. In contrast new analytical model studies based on the Marshall-Madden membrane polarization theory suggested that two relaxation processes might compete: the one along the short narrow pore (the throat) with one across the wider pore in case the narrow pores become relatively long. This paper presents a first systematically focused study into the relationship of pore throat sizes and SIP relaxation times. The generality of predicted trends is investigated across a wide range of materials differing considerably in chemical composition, specific surface and pore space characteristics. Three different groups of relaxation behaviors can be clearly distinguished. The different behaviors are related to clay content and type, carbonate content, size of the grains and the wide pores in the samples. (C) 2016 Elsevier B.V. All rights reserved.
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