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ASSESSMENT OF X-RAY MICRO-CT MEASUREMENTS OF POROSITY AND SOLUTE CONCENTRATION DISTRIBUTIONS DURING DIFFUSION IN POROUS GEOLOGIC MEDIA

Volume 16, Issue 8, 2013, pp. 683-694
DOI: 10.1615/JPorMedia.v16.i8.10
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ABSTRACT

Using x-ray micro-computed tomography (micro-CT) for quantitative measurements in porous media is inherently challenged by uncertainties, which need to be identified and quantified to enable meaningful interpretation of measurements. For this purpose, we present results of experiments using micro-CT to measure the three-dimensional distribution of diffusion-accessible porosity and time-variant iodide tracer concentration within dolostone and sandstone samples. The precision, detection limits and spatial resolution of measurements were determined. Using a 0.6 M iodide tracer, the precision of attenuation coefficient measurement was approximately ±4%, in both the dolostone and sandstone samples. The precision for diffusion-accessible porosity and solute concentration measurements were ±7% and ±0.04 M, with detection limits of 20% and 0.12 M, respectively. The spatial resolution of measurement was 40 μm, representing the minimum size of features that can be distinctively resolved in a reconstructed image with 18.23 μm voxel size.

CITED BY
  1. Hussein Esam M.A., Agbogun H.M.D., Al Tom A., Calibration-free quantification of interior properties of porous media with x-ray computed tomography, Applied Radiation and Isotopes, 97, 2015. Crossref

  2. Nunn Jacob A., Xiang Yan, Al Tom A., Investigation of partial water saturation effects on diffusion in shale, Applied Geochemistry, 97, 2018. Crossref

  3. Guber Andrey, Kutlu Turgut, Rivers Mark, Kravchenko Alexandra, Mass‐balance approach to quantify water distribution in soils based on X ‐ray computed tomography images , European Journal of Soil Science, 72, 2, 2021. Crossref

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