Widespread occurrence of aquifers currently undetectable with the MRS technique in the Grenville geological province, Canada |
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| Authors: | Jean Roy Alain Rouleau Michel Chouteau Michel Bureau |
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| Institution: | aIGP, CP 48671 CSP van Horne, Outremont, QC, Canada H2V 4T9;bHydrogéologie - Sciences de la Terre, UQAC, 555 Blvd. de l'Université, Chicoutimi, (Québec), Canada G7H 2B1;cDepartment CG&M, Ecole Polytechnique, C.P. 6079, succursale Centre-ville, Montréal (Québec), Canada H3C 3A7;dMBG Inc., 3470 Crois. Olivier, Brossard (Québec), Canada J4Y 2J5 |
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| Abstract: | In the summer of 2003, a series of field tests were made over aquifers within or next to the Grenville geological province, Canada. Twelve sites distributed within three general areas of the province and nearby to its southern border were surveyed with the MRS (Magnetic Resonance Sounding) technique. Each site was characterized by saturated shallow water bearing layers of high effective porosity. The tests were planned to evaluate the MRS technology in such environments for groundwater resources quantification and aquifer/aquitard media characterization. A priori, the environmental conditions in Eastern Canada were assumed favorable for MRS work such as low to moderate ambient noise, earth's field value above 55,000 nT, targets consisting of shallow and high porosity aquifers. Despite such conditions, no clear MRS responses were observed. Following supplementary investigations, this is now attributed to the wide-scale occurrence of disseminated magnetite within the aquifers which shorten the signal decay time. Although the lack of MRS response over aquifers has been reported before, this was not the case for such widespread occurrence. This also supports the adaptation of the MRS technology to conditions similar to those observed in the Grenville province. |
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| Keywords: | MRS (Magnetic Resonance Sounding) Aquifer characterization Grenville geological province Magnetite Internal magnetic field gradients |
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