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Volume 42 Number 3
  • E-ISSN: 1365-2478

Abstract

Abstract

The investigation of water in salt‐rock formations is of particular relevance to underground nuclear waste repositories. In the Asse salt‐mine (Germany) a study into the relationship of resistivity to water content has been made. Measurements were carried out in older rock‐salt using an electrode array in boreholes, an electrode profile in a drift and small resistivity sensors in and around a drift seal. Further measurements were made on moist zones in a contact area of younger rock‐salt and carnallitite and also in older rock‐salt with anhydrite bands using electrode profiles in the drifts. The resistivities range from 102Ωm to 106Ωm. Corresponding probes have water contents from 0.01% to 1.3%. A definite relationship between resistivity and water content is revealed which can be described by Archie's law using a cementation factor of 1.9. Porosities are between 0.08% and 1.4% and the saturations vary considerably. An explicit influence of saturation on resistivity cannot be discovered using the present data. The results enable us to estimate the water content and the order of the porosity using resistivity surveys at different scales. This increases significantly the safety of a nuclear repository site.

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2006-04-27
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