Understanding fluid transport through ...
Type de document :
Article dans une revue scientifique
URL permanente :
Titre :
Understanding fluid transport through claystones from their 3D nanoscopic pore network
Auteur(s) :
Song, Yang [Auteur]
Davy, Catherine [Auteur]
Bertier, Pieter [Auteur]
Troadec, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Davy, Catherine [Auteur]
Bertier, Pieter [Auteur]
Troadec, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Titre de la revue :
Microporous and Mesoporous Materials
Numéro :
228
Pagination :
64-85
Date de publication :
2016-07-01
Discipline(s) HAL :
Chimie/Matériaux
Résumé en anglais : [en]
This paper investigates the complex and nanoscopic pore network of claystones, after their retrieval from the geological layer, and their further conditioning and drying, as it is usually done to assess their fluid ...
Lire la suite >This paper investigates the complex and nanoscopic pore network of claystones, after their retrieval from the geological layer, and their further conditioning and drying, as it is usually done to assess their fluid permeability (i.e. their transport properties). Following the leading research of Keller et al. [1] on the Swiss Opalinus clay, and because no percolating pore network is obtained at bigger scales, we provide micrometric pore volumes for a French Toarcian claystone and for a Callovo-Oxfordian claystone [2], by Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM) imaging. The voxel size ranges from 5.94 × 7.54 × 10 nm3 to 8.49 × 10.78 × 50 nm3, and the investigated volumes range between 28 and 553 μm3. Comparison with nitrogen adsorption data is proposed. One originality of our research is to prepare the samples as for the assessment of macroscopic fluid transport, by moderate drying at centimetric size. It is observed that, at the scale imaged by FIB/SEM, fluid transport occurs through very limited percolating parts of the pore network (0.7–2.1%). For both claystones, pore volumes generally percolate by sub-micrometric cracks, attributed to drying, and more seldomly by tortuous parts (not of a crack nature). Fluid transport is predicted by Katz–Thompson equation from the 3D geometry of the shortest percolating path. This provides permeability values on the order of 10−21–10−20 m2 (1–10 nD), in good agreement with experimental data. This study hints at a mechanism of fluid transport by fingering through pores as small as 20 nm diameter, rather than homogeneously through the whole claystone volume.Lire moins >
Lire la suite >This paper investigates the complex and nanoscopic pore network of claystones, after their retrieval from the geological layer, and their further conditioning and drying, as it is usually done to assess their fluid permeability (i.e. their transport properties). Following the leading research of Keller et al. [1] on the Swiss Opalinus clay, and because no percolating pore network is obtained at bigger scales, we provide micrometric pore volumes for a French Toarcian claystone and for a Callovo-Oxfordian claystone [2], by Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM) imaging. The voxel size ranges from 5.94 × 7.54 × 10 nm3 to 8.49 × 10.78 × 50 nm3, and the investigated volumes range between 28 and 553 μm3. Comparison with nitrogen adsorption data is proposed. One originality of our research is to prepare the samples as for the assessment of macroscopic fluid transport, by moderate drying at centimetric size. It is observed that, at the scale imaged by FIB/SEM, fluid transport occurs through very limited percolating parts of the pore network (0.7–2.1%). For both claystones, pore volumes generally percolate by sub-micrometric cracks, attributed to drying, and more seldomly by tortuous parts (not of a crack nature). Fluid transport is predicted by Katz–Thompson equation from the 3D geometry of the shortest percolating path. This provides permeability values on the order of 10−21–10−20 m2 (1–10 nD), in good agreement with experimental data. This study hints at a mechanism of fluid transport by fingering through pores as small as 20 nm diameter, rather than homogeneously through the whole claystone volume.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ISEN
Univ. Valenciennes
ENSCL
CNRS
Institut Catholique Lille
Centrale Lille
Univ. Artois
Université de Lille
Univ. Valenciennes
ENSCL
CNRS
Institut Catholique Lille
Centrale Lille
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
Chimie, matériaux et procédés pour un nucléaire durable (CIMEND)
Date de dépôt :
2019-09-25T14:38:06Z