Determination of gas diffusion coefficients in saturated porous media: He and CH4 diffusion in Boom Clay

Jacops, Elke; Volckaert, G.; Maes, N.; Weetjens, Eef; Govaerts, Joan

doi:10.1016/j.clay.2013.08.047

Cited by 53 publications

(61 citation statements)

References 20 publications

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“…Measuring reliable diffusion coefficients of gases is not evident [21] and only a limited amount of data is available in the literature [22]. Recently, diffusion coefficients of dissolved gases (He and Ar) have been measured in Boom Clay, Callovo-Oxfordian Clay, and Opalinus Clay and results have been reported by Jacops et al [22] and Jacops et al [23].…”

Section: Introductionmentioning

confidence: 89%

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The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

et al. 2017

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In order to investigate in more detail the relation between the size of diffusing molecules and their diffusion coefficients (and geometric factors), diffusion experiments with gases of different size and tritiated water (HTO) have been performed on different clayey samples (Boom Clay, Eigenbilzen Sands, Opalinus Clay, Callovo-Oxfordian Clay, and bentonite with different dry densities). We observed that, for unreactive gases in clayey materials, the effective diffusion coefficient varies with the size of the diffusing molecule and this variation can be described by an exponential or a power law function. The variation of the geometric factor can also be described by an exponential function. The observed experimental relations can be used to estimate diffusion coefficients; by measuring experimentally in clay the effective diffusion coefficient of two unreactive dissolved gases with a different size, the diffusion coefficients of other dissolved gases (with a size in between the two measured gases) can be estimated by using the fitted exponential relationship.

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Section: Introductionmentioning

confidence: 89%

“…For the experimental setup of the design of the diffusion cell, see Jacops et al [21]. The Boom Clay sample (diameter 80 mm, length 30 mm) was loaded into the diffusion cell with a hydraulic press.…”

Section: Sample Preparationmentioning

confidence: 99%

The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

et al. 2017

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“…With this D e value, the He and Ne evolutions calculated reproduced satisfactorily the measured ones during the early 50 days for He and during more than one year for Ne. However G values could depend on the gas molecule size in clay rich rocks (Jacops et al 2013).…”

Section: Model Sensitivity Analysismentioning

confidence: 99%

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Vinsot

Appelo²,

Lundy

et al. 2017

Swiss J Geosci

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Two experiments have been installed at Mont Terri in 2004 and 2009 that allowed gas circulation within a borehole at a pressure between 1 and 2 bar. These experiments made it possible to observe the natural gases that were initially dissolved in pore-water degassing into the borehole and to monitor their content evolution in the borehole over several years. They also allowed for inert (He, Ne) and reactive (H 2 ) gases to be injected into the borehole with the aim either to determine their diffusion properties into the rock pore-water or to evaluate their removal reaction kinetics. The natural gases identified were CO 2 , light alkanes, He, and more importantly N 2 . The natural concentration of four gases in Opalinus Clay porewater was evaluated at the experiment location: N 2 2.2 mmol/L ± 25%, CH 4 0.30 mmol/L ± 25%, C 2 H 6 0.023 mmol/L ± 25%, C 3 H 8 0.012 mmol/L ± 25%.Retention properties of methane, ethane, and propane were estimated. Ne injection tests helped to characterize rock diffusion properties regarding the dissolved inert gases. These experimental results are highly relevant towards evaluating how the fluid composition could possibly evolve in the drifts of a radioactive waste disposal facility.

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“…The availability of diffusion coefficients for H 2 in water-saturated clays/clayrocks required for these calculations is still very limited. Due to the experimental difficulties associated with the determination of H 2 diffusion coefficients (Volckaert et al, 1995;Ortiz et al, 2002;Didier, 2012;Jacops et al, 2013), the diffusion coefficients of He are often used as a first approximation. Recently, significant progress has been made in the determination of reliable diffusion coefficients for H 2 in clay-rocks and shales (Jacops et al, 2013).…”

Section: Literature Reviewmentioning

confidence: 99%

“…Different types of through-diffusion experiments have been described in literature (Krooss and Schaefer, 1987;Rebour et al, 1997;Jacops et al, 2013). Cylindrical samples of known dimensions are usually placed into diffusion cells with gas source/sampling reservoirs on both sides.…”

Section: Diffusion Experimentsmentioning

confidence: 99%

Gas Transfer Through Clay Barriers

Amann-Hildenbrand

Krooss

Harrington

et al. 2015

Natural and Engineered Clay Barriers

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Determination of gas diffusion coefficients in saturated porous media: He and CH4 diffusion in Boom Clay

Cited by 53 publications

References 20 publications

The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Gas Transfer Through Clay Barriers

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