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TitreFracture systems controls on fluid flow in the regional sedimentary rock aquifer system of Montérégie Est, southern Québec, Canada
AuteurLadevèze, P; Laurencelle, M; Lefebvre, R; Rouleau, A; Crow, H; Rivard, C
SourceGeoMontréal 2013, Canadian Geotechnical Conference, abstracts; 2013 p. 1
LiensOnline - En ligne
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140055
ÉditeurIAH
RéunionGéoMontréal 2013, the 66th Canadian Geotechnical Conference and the 11th Joint CGS/IAH-CNC Groundwater Conference; Montreal; CA; Septembre 29 - Octobre 3, 2013
Documentlivre
Lang.anglais
Mediapapier
Formatsdocx; pdf
ProvinceQuébec
SNRC31H/01; 31H/02; 31H/03; 31H/06; 31H/07; 31H/08; 31H/09; 31H/10; 31H/11; 31H/14; 31H/15; 31H/16; 31I/02
Lat/Long OENS-73.5000 -72.0000 46.2500 45.0000
Sujetseau souterraine; circulation des eaux souterraines; écoulement de la nappe d'eau souterraine; régimes des eaux souterraines; résurgence des eaux souterraines; aquifères; hydrogéologie
Illustrationslocation maps; logs; cross-sections; photographs
ProgrammeAquifer Assessment & support to mapping, Géoscience des eaux souterraines
Résumé(disponible en anglais seulement)
The Montérégie Est regional rock aquifer system covers about 9000 km2 in an area located south-east of Montreal. It includes three watersheds, namely those of the Richelieu and Yamaska Rivers, and the Missisquoi Bay. At the regional scale, groundwater is flowing from the Appalachian Uplands through the St. Lawrence Lowlands. The sedimentary rocks in Montérégie Est are fractured and their structural properties are quite diverse. In the St. Lawrence Lowlands, rocks are slightly deformed, while rocks in the Appalachians are folded and faulted, and affected by low-grade metamorphism. Lithologies and structural contexts are expected to influence groundwater flow of this hydrogeological system. The groundwater resource assessment project in Montérégie Est includes several interrelated studies, one of which is the characterization of the controls exerted by geological structures and fracture networks on groundwater flow. Data collected for this specific study include hydraulic tests from consultant reports, as well as field data on rock fractures. Fieldwork consisted in borehole geophysical logging, especially acoustic televiewer logs and flowmeter testing, and outcrop observations and measurements. The methodology involves two steps. First, the fracture pattern was characterized using borehole televiewer and outcrop data. Fracture sets were defined within the regional aquifer, which allowed for the interpretation of the various structural contexts. Preferential orientations for open fractures were identified and then compared to the in-situ stress field. Secondly, hydraulic tests carried out in the study area were compiled, analysed, and compared for each structural context. The drawdown behavior provided information on the potential fracturing contribution to fluid flow. Hydraulic properties interpreted from the tests helped quantify the aquifer anisotropy induced by dominant open fracture sets in the different structural domains of this study area.
Résumé(Résumé en langage clair et simple, non publié)
Cette présentation fait partie du projet Richelieu-Yamaska (en Montérégie Est, sud QC, 9000 km2). Il vise à caractériser les contrôles exercés par les structures géologiques et des réseaux de fractures sur l¿écoulement des eaux souterraines. Les roches sédimentaires de la Montérégie Est (Basses-terres du Saint-Laurent et les Appalaches) sont fracturés et leurs propriétés structurales sont très diverses. La lithologie et la structure du massif rocheux devraient influencer l'écoulement des eaux souterraines de ce système hydrogéologique. Le travail de terrain consistait à des diagraphies géophysiques, des levés acoustiques, des mesures de débitmètre, et de l¿observation visuelle des affleurements.
GEOSCAN ID293960