Title :

Understanding fluid transport through the multiscale pore network of a natural shale

Author(s) :

Davy, Catherine A. [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Centrale Lille
Nguyen Kim, Thang [Auteur]
Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols [METIS]
Song, Yang [Auteur]
Troadec, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Blanchenet, Anne-Marie [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Adler, Pierre M. [Auteur]
Université Pierre et Marie Curie - Paris 6 [UPMC]
Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols [METIS]

Journal title :

EPJ Web of Conferences

Volume number :

140

Pages :

12016

Publication date :

2017

English abstract : [en]

The pore structure of a natural shale is obtained by three imaging means. Micro-tomography results are extended to provide the spatial arrangement of the minerals and pores present at a voxel size of 700 nm (the macroscopic ...
Show more >The pore structure of a natural shale is obtained by three imaging means. Micro-tomography results are extended to provide the spatial arrangement of the minerals and pores present at a voxel size of 700 nm (the macroscopic scale). FIB/SEM provides a 3D representation of the porous clay matrix on the so-called mesoscopic scale (10-20 nm); a connected pore network, devoid of cracks, is obtained for two samples out of five, while the pore network is connected through cracks for two other samples out of five. Transmission Electron Microscopy (TEM) is used to visualize the pore space with a typical pixel size of less than 1 nm and a porosity ranging from 0.12 to 0.25. On this scale, in the absence of 3D images, the pore structure is reconstructed by using a classical technique, which is based on truncated Gaussian fields. Permeability calculations are performed with the Lattice Boltzmann Method on the nanoscale, on the mesoscale, and on the combination of the two. Upscaling is finally done (by a finite volume approach) on the bigger macroscopic scale. Calculations show that, in the absence of cracks, the contribution of the nanoscale pore structure on the overall permeability is similar to that of the mesoscale. Complementarily, the macroscopic permeability is measured on a centimetric sample with a neutral fluid (ethanol). The upscaled permeability on the macroscopic scale is in good agreement with the experimental results.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
ISEN
Univ. Valenciennes
ENSCL
CNRS
INRA
Institut Catholique Lille
Centrale Lille

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520
• Unité Matériaux et Transformations (UMET) - UMR 8207

Submission date :

2019-05-16T17:21:10Z
2024-04-16T09:03:05Z