Transient Electromagnetic (TEM) Surveys as a First Approach for Characterizing a Regional Aquifer: The Case of the Saint-Narcisse Moraine, Quebec, Canada

Geological contexts that lack minimal stratigraphic and piezometric information can be challenging to produce an initial hydrogeological map in remote territories. This study proposes approach characterize a regional aquifer using transient electromagnetic (TEM) surveys. Given the presence of randomly dispersed boreholes, Saint-Narcisse moraine Mauricie region Quebec (Canada) is appropriate site for collecting required geophysical data, correlating information, characterizing granular aquifers terms stratigraphy, geometry, thickness, extent. In order use all TEM results (i.e., 47 stations) acquired area, we also correlated 13 stations, 7 6 cross-sections derive empirical local petrophysical relationship establish calibration chart sediments. Our combined with mapping sedimentary records from boreholes cross-sections, revealed compartmentalization multi-kilometer morainic system indicated two large unconfined overlying bedrock. These extend more than 12 km east west across area are between 25 >94 m thick. The method provides critical on groundwater at scale by acquiring multiple stations within short time span degree not possible other existing methodologies.