In situ characterization of the Callovo-Oxfordian pore water composition

Vinsot, Agnès; Mettler, S.; Wechner, Stefan

doi:10.1016/j.pce.2008.10.048

Cited by 121 publications

(75 citation statements)

References 11 publications

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“…The formation fluids are slightly saline waters, with ionic strengths of about 80-100 meq/L (Vinsot et al, 2008), that contain small amounts of dissolved gases. The chemistry of the COx pore water has been studied at ambient temperature (~25 °C) using, in particular, modelling approaches constrained by properties measured on core samples and by measurements of pore-water properties collected in boreholes drilled in the Meuse-Haute Marne Underground Rock Laboratory (Vinsot et al, 2008). The resulting predictive model satisfactorily reproduces the measured in situ pore-water composition.…”

Section: Geochemistry Of the Callovian-oxfordian Formation In The Conmentioning

confidence: 99%

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Lassin

Marty

Gailhanou

et al. 2016

Geochimica et Cosmochimica Acta

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, et al.. Equilibrium partial pressure of CO 2 in Callovian-Oxfordian argillite as a func-tion of relative humidity: experiments and modelling. Geochimica et Cosmochimica Acta, Elsevier, 2016Elsevier, , 186, pp.91-104. 10.1016Elsevier, /j.gca.2016 Accepted Manuscript This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractHaving previously demonstrated that the mineral assemblage of claystone can impose its pCO 2 under saturated conditions, we here study the effect of rock desaturation, i.e.the evaporation of pore water, on the partial pressure of CO 2 (pCO 2 ) in CallovianOxfordian argillite from the Paris Basin (France). In this new study, which combines experiments at room temperature and geochemical modelling, we examine the primary role of capillary forces on chemical equilibria for relative humidity values ranging between 50% and 100%. In particular we are able, without any fitting parameters, to model the experimental decrease of pCO 2 as a function of decreasing water content in the argillite. This application to a complex natural system not only confirms the theoretical concepts of geochemistry in capillary contexts, but is promising with respect to other systems, both natural (soil, rock) and industrial (ceramics, granular material).

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Section: Geochemistry Of the Callovian-oxfordian Formation In The Conmentioning

confidence: 99%

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Lassin

Marty

Gailhanou

et al. 2016

Geochimica et Cosmochimica Acta

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“…Values extracted from Vinsot et al [56] activity-composition model. The latter was used with codes PHREEQC2, iPHREEQC2, and CRUNCH.…”

Section: Physical Propertiesmentioning

confidence: 99%

Benchmarks for multicomponent reactive transport across a cement/clay interface

Marty¹,

Bildstein

Blanc³

et al. 2015

Comput Geosci

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International audienceThe use of the subsurface for CO2 storage, geothermal energy generation, and nuclear waste disposal will greatly increase the interaction between clay(stone) and concrete. The development of models describing the mineralogical transformations at this interface is complicated, because contrasting geochemical conditions (Eh, pH, solution composition, etc.) induce steep concentration gradients and a high mineral reactivity. Due to the complexity of the problem, analytical solutions are not available to verify code accuracy, rendering code intercomparisons as the most efficient method for assessing code capabilities and for building confidence in the used model. A benchmark problem was established for tackling this issue. We summarize three scenarios with increasing geochemical complexity in this paper. The processes considered in the simulations are diffusion-controlled transport in saturated media under isothermal conditions, cation exchange reactions, and both local equilibrium and kinetically controlled mineral dissolution-precipitation reactions. No update of the pore diffusion coefficient as a function of porosity changes was considered. Seven international teams participated in this benchmarking exercise. The reactive transport codes used (TOUGHREACT, PHREEQC, with two different ways of handling transport, CRUNCH, HYTEC, ORCHESTRA, MIN3P-THCm) gave very similar patterns in terms of predicted solute concentrations and mineral distributions. Some differences linked to the considered activity models were observed, but they do not bias the general system evolution. The benchmarking exercise thus demonstrates that a reactive transport modelling specification for long-term performance assessment can be consistently addressed by multiple simulators

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“…For osmotic resaturation, synthetic solutions were prepared with ultrapure deionised water (18.2 MΩ cm −1 ), PEG 6000 (Merck, Germany), and commercial salts (American Chemical Society reagent grade or higher quality and purity salts), so as to obtain a chemical composition as close as possible to pore water and to limit as much as possible any chemical disturbance. The recipe to mimic pore water condition was based on the chemical composition measured from in situ water sampling performed at a level close to the sampling level of this study (475 m bgl) [24]. The total concentrations for calcium, magnesium, potassium, and sodium were 3.0, 2.0, 1.7, and 51.6 mmol L −1 , respectively.…”

Section: Desaturation Procedurementioning

confidence: 99%

Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones

et al. 2017

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The diffusion and adsorption behaviors of sodium and cesium were investigated in the Callovo-Oxfordian claystones (France) under unsaturated conditions. Through-, out-, and in-diffusion laboratory experiments were performed on intact and compacted samples. These samples were partially saturated using an osmotic method for imposed suction up to 9 MPa. This specific technique enabled us to obtain water saturation degree ranging from 81% to 100% for intact samples and from 70% to 100% for compacted materials. The results showed a very low impact of water saturation on the extent of adsorption for 22 Na and cesium, onto intact and compacted materials. Such observations suggest that the saturation degrees were not low enough to limit the access of cations to adsorption sites on clay surfaces. At full saturation, enhanced diffusion for 22 Na and cesium was clearly evidenced onto intact and compacted samples. Under unsaturated conditions, the diffusion behavior for Cs and 22 Na was not only slower but also distinct as compared to fully saturated samples. For the intact rock and under suction of 1.9 MPa, the Cs diffusivity was reduced by a factor of 17, whereas for sodium, it was reduced by a factor of 5. Explanation was then proposed to explain such a difference.

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In situ characterization of the Callovo-Oxfordian pore water composition

Cited by 121 publications

References 11 publications

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Benchmarks for multicomponent reactive transport across a cement/clay interface

Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones

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In situ characterization of the Callovo-Oxfordian pore water composition

Cited by 121 publications

References 11 publications

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Equilibrium partial pressure of CO2 in Callovian–Oxfordian argillite as a function of relative humidity: Experiments and modelling

Benchmarks for multicomponent reactive transport across a cement/clay interface

Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones

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Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones