Borehole electrical resistivity, Vars-Winchester esker aquifer, Ontario / G.A. Oldenborger. : M183-2/8904E-PDF

"Electrical resistivity and induced polarization surveys were conducted for a portion of the Vars-Winchester esker aquifer system near Embrun, Ontario. Resistivity data were acquired within boreholes as 1D logs, along the surface as 2D profiles, and from surface-to-borehole as 3D volumes. Borehole logs and pseudo-logs of electrical resistivity and chargeability from these surveys are compared to borehole geophysical logs, lithological logs, and hydraulic conductivity measurements collected at the study site. The resistivity records are in nominal agreement with electromagnetic induction logs of apparent resistivity, but there are significant differences attributed to scale and an anisotropy factor of approximately 2. Estimates of petrophysical model parameters and surface conductivity derived using the borehole fluid conductivity logs are not reliable. However, the borehole induction logs and pseudo-logs recovered from 1D, 2D, and 3D surveys all exhibit some separability of resistivity in terms of lithology that can be used for geological classification, and some correlation of resistivity with hydraulic conductivity that can be used for prediction away from the boreholes. Fidelity may be limited to the approximate distinction of aquifer versus aquiclude, particularly for the lowest-resolution 2D surface surveys"--Summary, page 1.

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