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Rock matrix diffusivity determinations by in-situ electrical conductivity measurements
KTH, Superseded Departments, Chemical Engineering and Technology.
2001 (English)In: Journal of Contaminant Hydrology, ISSN 0169-7722, E-ISSN 1873-6009, Vol. 47, no 04-feb, 117-125 p.Article in journal (Refereed) Published
Abstract [en]

A fast method to determine rock matrix diffusion properties directly in the bedrock would be valuable in the investigation of a possible site for disposal of nuclear waste. An effective diffusivity borehole log would provide important information on the variability of this entity over the area studied. As opposed to traditional matrix diffusion laboratory experiments. electrical conductivity measurements are fast, inexpensive and also easy to carry out in-situ. In this study, electrical resistivity data from borehole logging, as well as from measurements on the actual core, is evaluated with the purpose of extracting matrix diffusivity data. The influence of migration of ions in the electrical double layer, which can be of great importance in low ionic strength pore water. is also considered in evaluating the in-situ data to accurately determine the effective pore diffusivity. The in-situ data compare fairly well to those measured in the rock core.

Place, publisher, year, edition, pages
2001. Vol. 47, no 04-feb, 117-125 p.
Keyword [en]
matrix diffusion, in-situ, conductivity, resistivity
URN: urn:nbn:se:kth:diva-20343ISI: 000166844400003OAI: diva2:339038
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Neretnieks, Ivars
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