| Titre | Pore characterization of organic-rich shales through application of topological data analysis and persistent homology |
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| Auteur | Bizhani, M ;
Ardakani, O H |
| Source | Energy & Fuels vol. 35, 2021 p. 18563-18573, https://doi.org/10.1021/acs.energyfuels.1c03255 |
| Image |  |
| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20210352 |
| Éditeur | American Chemical Society |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1021/acs.energyfuels.1c03255 |
| Media | papier; numérique; en ligne |
| Formats | pdf |
| Sujets | taille des pores; schistes; grès; Sciences et technologie; sédimentologie |
| Illustrations | tableaux; images 3D; diagrammes de distribution; graphiques |
| Programme | Les géosciences de l'énergie Ressources d'énergie propre - réduire les risques environnementaux |
| Diffusé | 2021 11 08 |
| Résumé | (disponible en anglais seulement)
This paper discusses pore characterization of organic-rich using 3D high-resolution imaging and topological data analysis (TDA) framework. In particular, our
focus is on persistent homology. Our dataset contains four organic-rich shale samples (imaged at 10 nm3/voxel) and a Bentheimer sandstone as the anchor point for comparison. The analysis shows pores larger than 12.4nm have poor connectivity, and
there is no evidence of percolating path through any of the shale samples. In contrast, the Bentheimer sandstone shows remarkable differences from the shales in terms of pore connectivity. In terms of geometry, pores and grains in shale are shown to
be highly non-convex, while sandstone exhibits a more uniform and convex distribution of pore and grain size. Euler characteristics of the samples are also computed and discussed along with the pore network extracted on the segmented images. The
results show all three methods have an agreement in the overall description of the pore space. However, persistent homology data reveals more information on the pore and grain phase as compared to the other methods. In the last section of the paper,
we present an investigation of topological changes in the pore space as a function of pore radius. The analysis indicates most pores must be enlarged by approximately equal to 70-80nm for the pore space to span into a connected network. The
implication is that flow mainly occurs through independent channels in shales, as opposed to sandstone where many redundant flow pathways exist. |
| Sommaire | (Résumé en langage clair et simple, non publié)
L'utilisation d'images microscopiques à haute résolution est une méthode courante pour la caractérisation des microstructures internes de divers
types de roches. Nous appliquons un cadre mathématique (méthode d'analyse de données topologiques) pour décoder divers aspects de la géométrie des pores et des grains et de la morphologie de plusieurs échantillons de schiste. L'approche topologique
démontre une capacité supérieure par rapport aux méthodes traditionnelles à révéler les caractéristiques de bas niveau des structures internes des roches. De plus, l'analyse permet de mieux comprendre le mécanisme d'écoulement des fluides dans les
schistes riches en matières organiques. |
| GEOSCAN ID | 329036 |
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