Application of 2D resistivity profiling for mapping and interpretation of geology in a till aquitard near Luck Lake, Southern Saskatchewan, Canada

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• 作者：Khaled S. Gemail
• 关键词：Luck Lake ; Saskatchewan ; 2D Resistivity imaging ; Quaternary ; Intertill gravel ; Glaciolacustrine
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：73
• 期：3
• 页码：923-935
• 全文大小：8,795 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

In Southern Saskatchewan, Canada, the clay-rich till deposits are important as sites for waste disposal and as protective covers on regional aquifers due to their low hydraulic conductivity and great thickness. In such case, it is very important to fully understand the detailed distribution and the variation of the gravel areas in the glacial cap to study the infiltration speed in the subsoil. Resistivity measurements in the form of 1D Schlumberger sounding and 2D Wenner resistivity profiling were carried out in the area north of Luck Lake, Southern Saskatchewan, to map the extent of gravel substratums in the till cap and to investigate the impact of a known fault on the gravel and till in the area. These measurements were controlled with depth and single point resistivity information from two boreholes drilled previously. The analysis of the 2D inverted sections shows the importance of electrical resistivity techniques for mapping the lateral and vertical heterogeneities in the till deposits, which are related to the hydraulic processes controlling groundwater recharge. The 2D resistivity imaging sections show the major till units on both sides of the east–west fault system. The strong resistivity contrast between the upper part of the till (10-3?Ωm) and the basal part (>150?Ωm) allows the mapping of a gravel layer in the lower parts. This gravel substratum is better defined and more significant towards the ridge in the northern area due to its greater thickness and higher resistivity. The lowland area is characterized by clay-rich of glaciolacustrine deposits identified in a borehole and by low resistivities (