| Titre | The influence of rigid matrix minerals on organic porosity and pore size in shale reservoirs: Upper Devonian Duvernay Formation, Alberta, Canada |
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| Auteur | Knapp, L J; Ardakani, O H ; Uchida, S; Nanjo, T; Otomo, C; Hattori, T |
| Source | International Journal of Coal Geology vol. 227, 103525, 2020 p. 1-23, https://doi.org/10.1016/j.coal.2020.103525 |
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190532 |
| Éditeur | Elsevier |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.coal.2020.103525 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Alberta |
| SNRC | 72M; 73D; 73E; 73L; 73M; 74D; 82M; 82N; 82O; 82P; 83; 84A; 84B; 84C; 84D; 93A; 93H; 93I; 93P; 94A |
| Lat/Long OENS | -120.0778 -110.0514 57.0000 51.0000 |
| Sujets | Dévonien supérieur; ressources pétrolières; hydrocarbures; roches reservoirs; porosité; taille des pores; maturation thermique; Formation de Duvernay ; combustibles fossiles; sédimentologie; minéralogie;
Sciences et technologie; Nature et environnement; Phanérozoïque; Paléozoïque; Dévonien |
| Illustrations | cartes de localisation; échelles stratigraphiques; tableaux; diagrammes; graphiques |
| Programme | Les géosciences pour les nouvelles sources d'énergie Caractérisation des réservoirs de schiste |
| Diffusé | 2020 05 28 |
| Résumé | (disponible en anglais seulement)
Organic porosity is an important component of the pore system in many shale hydrocarbon reservoirs. While much research has been directed towards understanding
the development of organic porosity as a function of thermal maturity, relationships between mineralogy and organic porosity have been less extensively investigated. This study illustrates the role of rigid matrix minerals, particularly
biogenically-sourced microcrystalline quartz, on organic porosity and pore size enhancement. The Upper Devonian Duvernay Formation of western Canada is a siliceous-calcareous self-sourced reservoir with 3.2-3.49 wt.% average total organic carbon
(TOC) in a study area occurring in the volatile oil to dry gas thermal maturity zones. Biogenic silica is widely distributed throughout the matrix as microcrystalline quartz and locally comprises >50 wt.% of the rock. Porosity and pore size data
gathered from BIB- and FIB-SEM, helium porosimetry, H1 NMR T2, and MICP indicate that organic porosity and pore size is enhanced when in association with biogenic silica. Biogenic silica forms a rigid siliceous matrix framework that limits compaction
of pores and ductile organic matter and clay minerals. Where biogenic silica concentration is low, clay mineral (mica+illite) interparticle micro- and fine mesopores dominate. In these samples detrital quartz and biogenic silica have limited
influence on pore size other than to preserve the small fraction of organic macropores. The occurrence of biogenic- and clay-dominated pore systems varies systematically with stratigraphic and lateral variations in lithofacies, and sharp contrasts
are observed across sequence boundaries. The observation that mineralogy strongly influences the ability for organic pores to be preserved confirms that studies examining the relationship between thermal maturity and organic porosity must account for
mineralogical variations. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cette étude traite des mécanismes par lesquels les minéraux à matrice rigide, en l'occurrence le quartz microcristallin provenant de la silice
biogénique, exercent un fort contrôle sur le volume et la distribution de la taille des pores, particulièrement pour la porosité organique. |
| GEOSCAN ID | 321804 |
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