| Titre | Salt dissolution and permeability in the Western Canada Sedimentary Basin |
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| Auteur | Woroniuk, B; Tipton, K; Grasby, S E ; McIntosh, J C; Ferguson, G |
| Source | Hydrogeology Journal vol. 27, issue 1, 2018 p. 161-170, https://doi.org/10.1007/s10040-018-1871-6 |
| Image |  |
| Année | 2018 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20180181 |
| Éditeur | Springer Nature America, Inc |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1007/s10040-018-1871-6 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Saskatchewan; Manitoba; Alberta |
| SNRC | 62; 63A; 63B; 63C; 63D; 63E; 63F; 63G; 63H; 63I; 63J; 63K; 63L; 72; 73A; 73B; 73C; 73D; 73E; 73F; 73G; 73H; 73I; 73J; 73K; 73L |
| Région | Montana; North Dakota |
| Lat/Long OENS | -111.0000 -97.0000 55.0000 48.0000 |
| Sujets | eau souterraine; écoulement de la nappe d'eau souterraine; établissement de modèles; bassins sédimentaires; géologie du substratum rocheux; lithologie; roches sédimentaires; évaporites; dépôts de sel;
halite; anhydrite; carbonates; brèches; analyses hydrauliques; perméabilité; essais aux tiges; fractures; précipitation; géochimie des eaux souterraines; diagraphie géophysique; Bassin sédimentaire de l'ouest du Canada; Bassin de Williston ;
Formation de Prairie Evaporite ; Formation de Dawson Bay ; Formation de Souris River ; hydrogéologie; géochimie; géophysique |
| Illustrations | cartes de localisation; échelles stratigraphiques; diagraphies géophysiques; cartes géolscientiques généralisées; graphiques; diagrammes de distribution des fréquences |
| Programme | Géoscience des eaux souterraines Gestionnaire de programme - Géoscience des eaux souterraines |
| Diffusé | 2018 09 20 |
| Résumé | (disponible en anglais seulement)
Extensive dissolution of evaporites has occurred in the Williston Basin, Canada, but it is unclear what effect this has had on bulk permeability. The bulk of
this dissolution has occurred from the Prairie Evaporite Formation, which is predominantly halite and potash. However, minor evaporite beds and porosity infilling have also been removed from the overlying Dawson Bay and Souris River formations, which
are predominantly carbonates. This study examines whether permeability values in the Dawson Bay and Souris River formations have been affected by dissolution, by analyzing 142 drillstem tests from those formations. For both the Dawson Bay and Souris
River formations, the highest permeabilities were found in areas where halite dissolution had occurred. However, the mean permeabilities were not statistically different in areas of halite dissolution compared to those containing connate water.
Subsequent precipitation of anhydrite is known to have clogged pore spaces and fractures in some instances. Geochemical relationships found here support this idea but there is no statistically significant relationship between anhydrite saturation and
permeability. Geomechanical effects, notably closure of fractures due to collapse, could be a mitigating factor. The results indicate that coupling dissolution and precipitation to changes in permeability in regional flow models remains a significant
challenge. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Article qui discute du changement de propriétés physiques des roches sédimentaires à la suite de la dissolution du sel contenu dans les roches
sédimentaires. Ceci pourrait avoir une incidence sur la dynamique d'écoulement de l'eau souterraine dans les environnements profonds. |
| GEOSCAN ID | 311136 |
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