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TitreInterface mapping of hydrochemical groundwater regimes in the Paleozoic bedrock of southwestern Ontario
TéléchargerTéléchargement (publication entière)
AuteurCarter, T R; Sutherland, L
SourceSouthern Ontario groundwater project 2014-2019: summary report; par Russell, H A J (éd.); Kjarsgaard, B A (éd.); Commission géologique du Canada, Dossier public 8536, 2020, 37-48 pages, https://doi.org/10.4095/321083 (Accès ouvert)
Année2020
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/321083
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Russell, H A J; Kjarsgaard, B A; (2020). Southern Ontario groundwater project 2014-2019: summary report, Commission géologique du Canada, Dossier public 8536
Formatspdf
ProvinceOntario
SNRC30; 31C; 31D; 40; 41A; 41G; 41H
Lat/Long OENS -83.5000 -76.0000 45.3333 41.5000
Sujetseau souterraine; ressources en eau souterraine; aquifères; géochimie des eaux souterraines; régimes des eaux souterraines; écoulement de la nappe d'eau souterraine; zonéographie; salinité; saumure; eau sulfureuse; eaux atmosphériques; gaz d'hydrogène sulfuré; ressources pétrolières; génie pétrolier; puits de pétrole; puits de gaz; puits d'eau; sondage; établissement de modèles; analyses géochimiques; solides complètement dissous; géologie du substratum rocheux; lithologie; roches sédimentaires; évaporites; sel; grès; schistes; calcaires; carbonates; dolomies; Formation de Guelph ; Groupe de Port Lambton ; Formation de Kettle Point ; Groupe d'Hamilton ; Formation de Marcellus ; Formation de Dundee ; Formation de Lucas ; Formation d'Onondaga ; Formation d'Amherstburg ; Formation de Bois Blanc ; Formation de Bass Islands ; Formation de Clinton ; Formation de Cataract ; Formation de Queenston ; Formation de la baie Georgienne; Formation de Blue Mountain ; Groupe de Trenton ; Groupe de Black River ; Formation de Shadow Lake ; eau douce; hydrogéologie; géochimie; combustibles fossiles; Nature et environnement; Sciences et technologie; Phanérozoïque; Paléozoïque; Dévonien; Silurien; Ordovicien; Cambrien
Illustrationstables; stratigraphic cross-sections; location maps; geoscientific sketch maps; stratigraphic charts; frequency distribution diagrams
ProgrammeGéoscience des eaux souterraines, Caractéristiques d'aquifères et support cartographique
Diffusé2020 05 28
Résumé(disponible en anglais seulement)
Groundwater in southern Ontario exhibits a crude hydrochemical zonation, by increasing depth, of shallow fresh water, brackish to saline sulphur water at intermediate depths, and deep brine, within a system of thin aquifers separated by thick aquitards. Aquifers are recharged by meteoric water at their outcrop and subcrop edges. The present study has mapped geographic variations in the interpreted depth of the interface/transition zone between the intermediate sulphur water regime and deep brine. Available data indicates a regional depth transition from brackish-to-saline sulphur water to deep brine at approximately 200 to 300 m below the top of bedrock and locally to 350 m, with local variation largely related to down-dip distance from subcrop/outcrop edges. The intermediate regime is interpreted to be formed by penetration of both modern meteoric water and glacial meltwater into subcropping/outcropping porous and permeable bedrock strata, with downdip flow over a distance of 25 to 65 km, and partial to complete displacement and dilution of original pore fluids. Stratigraphically, the water of the shallow and intermediate regimes is generally confined above the Salina Group. The interface boundary with deep brine approximates the base of interaction of groundwater with surface water and can be used as a depth constraint for downward penetration of meteoric water in numeric modelling. Accurate knowledge of interface boundary depths is also needed in design of petroleum well drilling, casing and cement programs to mitigate drilling hazards posed by corrosive sulphur water and potential release of H2S gas at surface. The maps can be used as a constraint on the drilling depth of new water wells, as at deeper depths progressively more saline waters will likely be encountered.
GEOSCAN ID321083