Large-scale laboratory diffusion experiments in clay rocks

Garcı́a-Gutiérrez, Miguel; Cormenzana, J.L.; Missana, Tiziana; Mingarro, M.; Martín, Pedro Luis

doi:10.1016/j.pce.2006.04.004

Cited by 29 publications

(11 citation statements)

References 6 publications

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“…While radionuclide transport in clay formation has been studied using laboratory tests (e,g, Appelo et al 2010, Garcia-Gutierrez et al, 2008, Maes et al, 2008, short-term field tests (e.g. Garcia-Gutierrez et al 2006, Soler et al 2008, van Loon et al 2004, Wu et al 2009) and numerical modeling (de Windt et al 2003;, the effects of THMC processes on radionuclide transport are not fully investigated. This report documents the progress that has been made in FY12.…”

Section: Introductionmentioning

confidence: 99%

Modeling Radionuclide Transport in Clays

Zheng¹

2012

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Section: Introductionmentioning

confidence: 99%

Modeling Radionuclide Transport in Clays

Zheng¹

2012

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“…Extensive studies on the Opalinus clay (Switzerland) and Callovo-Oxfordian clay (France) have shown that the diffusion in these media is prominent in the direction parallel to the bedding plane (e.g., Van Loon et al, 2004a, 2004bGarcía-Gutiérrez et al, 2006Samper et al, 2008a). Numerical models of in-situ experiments performed in these areas have treated directional diffusivities as a diffusion tensor of rank two (e.g., Wersin et al, 2004;Yllera et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these non-ideal effects, García-Gutiérrez et al (2006) developed a large-scale laboratory diffusion experiment by tracer profiling of a cylindrical block (0.3×0.3 m), and evaluated the diffusion anisotropy of the Opalinus clay using HTO, 36 Cl -, and 85 Sr. The diffusion anisotropy estimated from HTO and 36 Cl -were consistent with those evaluated by Van Loon et al (2004a) from through-diffusion experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Van Loon et al (2004a) evaluated the diffusion anisotropy of Opalinus clay under 1D mechanical stresses by 1D and radial through-diffusion experiments using HTO, 36 Cl -, and 22 Na + . The derived properties have been successively applied to the interpretation of in-situ experiments and the performance confirmation of newly developed experiments measuring diffusion anisotropy (Soler et al, 2008;García-Gutiérrez et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…However, tracer profiles obtained from conventional diffusion experiments are often uninformative regarding the anisotropy of the diffusion process. If tracer profiles are measured at the end of a diffusion experiment but without monitoring the transient tracer diffusion process, separate diffusion experiments for the same material and tracer are necessary to deduce the appropriate time for tracer profiling (García-Gutiérrez et al, 2006). Moreover, the representativeness of the estimated diffusion anisotropy remains questionable.…”

Section: Introductionmentioning

confidence: 99%

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An axisymmetric diffusion experiment for the determination of diffusion and sorption coefficients of rock samples

Takeda¹,

Hiratsuka²,

Ito³

et al. 2011

Journal of Contaminant Hydrology

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Diffusion anisotropy is a critical property in predicting migration of substances in sedimentary formations with very low permeability. The diffusion anisotropy of sedimentary rocks has been evaluated mainly from laboratory diffusion experiments, in which the directional diffusivities are separately estimated by through-diffusion experiments using different rock samples, or concurrently by in-diffusion experiments in which only the tracer profile in a rock block is measured.To estimate the diffusion anisotropy from a single rock sample, this study proposes an axisymmetric diffusion test, in which tracer diffuses between a cylindrical rock sample and a surrounding solution reservoir. The tracer diffusion between the sample and reservoir can be monitored from the reservoir tracer concentrations, and the tracer profile could also be obtained after dismantling the sample. Semi-analytical solutions are derived for tracer concentrations in both the reservoir and sample, accounting for an anisotropic diffusion tensor of rank two as well as the dilution effects from sampling and replacement of reservoir solution.The transient and steady-state analyses were examined experimentally and numerically for different experimental configurations, but without the need for tracer profiling. These experimental configurations are tested for in-and out-diffusion experiments using Koetoi and Wakkanai mudstones and Shirahama sandstone, and are scrutinized by a numerical approach to identify favorable conditions for parameter estimation. Page 2 of 31The analysis reveals the difficulty in estimating diffusion anisotropy; test configurations are proposed for enhanced identifiability of diffusion anisotropy. Moreover, it is demonstrated that the axisymmetric diffusion test is efficient in obtaining the sorption parameter from both steady-state and transient data, and in determining the effective diffusion coefficient if isotropic diffusion is assumed. Moreover, measuring reservoir concentrations in an axisymmetric diffusion experiment coupled with tracer profiling may be a promising approach to estimate of diffusion anisotropy of sedimentary rocks.

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Advection and Dispersion of Dissolved Species in Aquifers

Rumynin

2011

Theory and Applications of Transport in Porous Media

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Large-scale laboratory diffusion experiments in clay rocks

Cited by 29 publications

References 6 publications

Modeling Radionuclide Transport in Clays

Modeling Radionuclide Transport in Clays

An axisymmetric diffusion experiment for the determination of diffusion and sorption coefficients of rock samples

Advection and Dispersion of Dissolved Species in Aquifers

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