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Related Experiment Videos

Rock matrix diffusivity determinations by in-situ electrical conductivity measurements.

Y Ohlsson1, M Löfgren, I Neretnieks

  • 1Department of Chemical Engineering, Royal Institute of Technology, Teknikringen 26, 100 44 Stockholm, Sweden. yvonne@ket.kth.se

Journal of Contaminant Hydrology
|April 6, 2001
PubMed
Summary

This study introduces a fast, in-situ method using electrical resistivity to determine rock matrix diffusion properties for nuclear waste disposal investigations. In-situ data closely matches laboratory core measurements, validating the technique.

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Area of Science:

  • Geosciences
  • Environmental Science
  • Nuclear Engineering

Background:

  • Investigating nuclear waste disposal sites requires understanding rock matrix diffusion properties.
  • Traditional laboratory diffusion experiments are time-consuming and costly.
  • In-situ methods are needed for efficient site characterization.

Purpose of the Study:

  • To develop and evaluate a fast, in-situ method for determining rock matrix diffusion properties.
  • To assess the feasibility of using electrical resistivity borehole logging for this purpose.
  • To compare in-situ measurements with traditional laboratory core analyses.

Main Methods:

  • Electrical resistivity measurements were conducted using borehole logging and on rock core samples.
  • Data analysis incorporated the influence of ion migration in the electrical double layer, crucial for low ionic strength pore water.

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  • Effective pore diffusivity was calculated from resistivity data.

    • Main Results:

    • Electrical resistivity data from in-situ borehole logging were successfully evaluated to extract matrix diffusivity.
    • The in-situ determined matrix diffusivity values showed good agreement with those measured in laboratory core samples.
    • The method provides a rapid assessment of diffusion property variability across a site.

    Conclusions:

    • Electrical resistivity borehole logging offers a fast and cost-effective in-situ alternative to traditional methods for assessing rock matrix diffusion.
    • This technique is valuable for characterizing potential nuclear waste disposal sites.
    • Accurate determination of effective pore diffusivity is achievable by considering the electrical double-layer effect.