Is it the grain size or the characteristic pore size that controls the induced polarization relaxation time of clean sands and sandstones?

Details

Serval ID
serval:BIB_C74ACDFC7540
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Is it the grain size or the characteristic pore size that controls the induced polarization relaxation time of clean sands and sandstones?
Journal
Water Resources Research
Author(s)
Revil A., Koch K., Holliger K.
ISSN-L
0043-1397
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
48
Pages
W05602
Language
english
Notes
Revil2012
Abstract
There is a wide range of evidence to suggest that permeability can
be constrained through of induced polarization measurements. For
clean sands and sandstones, current mechanistic models of induced
polarization predict a relationship between the low-frequency time
constant inferred from induced polarization measurements and the
grain diameter. A number of observations do, however, disagree with
this and indicate that the observed relaxation behavior is rather
governed by the so-called dynamic pore radius L. To test this hypothesis,
we have developed a set of new scaling relationships, which allow
the relaxation time to be computed from the pore size and the permeability
to be computed from both the Cole-Cole time constant and the formation
factor. Moreover, these new scaling relationships can be also used
to predict the dependence of the Cole-Cole time constant as a function
of the water saturation under unsaturated conditions. Comparative
tests of the proposed new relationships with regard to various published
experimental results for saturated clean sands and sandstones as
well as for partially saturated clean sandstones, do indeed confirm
that the dynamic pore radius L is a much more reliable indicator
of the observed relaxation behavior than grain-size-based models.
Keywords
SPECTRAL INDUCED POLARIZATION, HYDRAULIC-PROPERTIES, POROUS-MEDIA, SHALY SANDS, PERMEABILITY, CONDUCTIVITY, DISPERSION, TRANSPORT
Create date
25/11/2013 17:31
Last modification date
20/08/2019 15:42
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