[Effets de la résolution d’image et de la discrétisation numérique sur les évaluations de la perméabilité]
Digital Rock Physics (DRP) analysis is a widely employed technique for predicting transport parameters from 3D images of core samples. However, the effects of image resolution and spatial discretization of the DRP mesh grid have rarely been systematically studied in detail. To address this issue, we examine a generic sand pack, representing a homogeneous porous medium. This sample was imaged using X-ray micro-tomography at three different spatial resolutions (6, 3, and 1.5 microns/voxel). Permeability is then numerically evaluated by solving the Stokes flow equations using a finite volume method. The processed meshes for converged macroscopic evaluations consist of 105 million to 58 billion cells, necessitating the alternative use of a two-step upscaling method. By employing both methods, this study analyzes the respective influences of image resolution and spatial discretization. Significant effects are observed from both image resolution and spatial discretization, the analysis of which can contribute to identifying optimal strategies for enhancing the accuracy of permeability evaluation.
L’analyse numérique des roches est une technique largement utilisée pour prédire les paramètres de transport à partir d’images 3D d’échantillons. Cependant, les effets de la résolution d’image et de la discrétisation spatiale ont rarement fait l’objet d’études systématiques et approfondies. Pour remédier à cela, nous examinons un paquet de sable générique, représentant un milieu poreux homogène. Cet échantillon a été imagé par micro-tomographie à rayons X à trois résolutions spatiales différentes (6, 3 et 1,5 micron/voxel). La perméabilité est ensuite évaluée numériquement en résolvant les équations de Stokes à l’aide d’une méthode des volumes finis. Les maillages utilisés pour les évaluations macroscopiques comptent entre 105 millions et 58 milliards de cellules, ce qui nécessite le recours à une méthode de changement d’échelle en deux étapes. En utilisant ces deux méthodes, cette étude analyse les influences respectives de la résolution d’image et de la discrétisation spatiale. Des effets significatifs sont observés tant au niveau de la résolution d’image que de la discrétisation spatiale, dont l’analyse peut contribuer à identifier des stratégies optimales pour améliorer la précision de l’évaluation de la perméabilité.
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Mots-clés : Résolution de l’image, discrétisation spatiale, changement d’échelle à deux étapes, perméabilité
Romain Guibert 1 ; Peter Moonen 2 , 3 ; Pierre Horgue 1 ; Patrice Creux 2 ; Franck Plouraboué 1 ; Gérald Debenest 1
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Romain Guibert; Peter Moonen; Pierre Horgue; Patrice Creux; Franck Plouraboué; Gérald Debenest. Effects of image resolution and numerical discretization on permeability evaluations. Comptes Rendus. Mécanique, Volume 354 (2026), pp. 481-493. doi: 10.5802/crmeca.363
@article{CRMECA_2026__354_G1_481_0,
author = {Romain Guibert and Peter Moonen and Pierre Horgue and Patrice Creux and Franck Plourabou\'e and G\'erald Debenest},
title = {Effects of image resolution and numerical discretization on permeability evaluations},
journal = {Comptes Rendus. M\'ecanique},
pages = {481--493},
year = {2026},
publisher = {Acad\'emie des sciences, Paris},
volume = {354},
doi = {10.5802/crmeca.363},
language = {en},
}
TY - JOUR AU - Romain Guibert AU - Peter Moonen AU - Pierre Horgue AU - Patrice Creux AU - Franck Plouraboué AU - Gérald Debenest TI - Effects of image resolution and numerical discretization on permeability evaluations JO - Comptes Rendus. Mécanique PY - 2026 SP - 481 EP - 493 VL - 354 PB - Académie des sciences, Paris DO - 10.5802/crmeca.363 LA - en ID - CRMECA_2026__354_G1_481_0 ER -
%0 Journal Article %A Romain Guibert %A Peter Moonen %A Pierre Horgue %A Patrice Creux %A Franck Plouraboué %A Gérald Debenest %T Effects of image resolution and numerical discretization on permeability evaluations %J Comptes Rendus. Mécanique %D 2026 %P 481-493 %V 354 %I Académie des sciences, Paris %R 10.5802/crmeca.363 %G en %F CRMECA_2026__354_G1_481_0
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