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TitleDownhole geophysical data from two boreholes in the south Simcoe County, Ontario
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorCrow, H LORCID logo; Brewer, K D; Bajc, A F; Pugin, A J -M; Mulligan, R P M; Russell, H A JORCID logo
SourceGeological Survey of Canada, Open File 7883, 2015, 18 pages (2 sheets), Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; las
NTS31D/04; 31D/05
AreaLake Simcoe; Thornton; Barrie
Lat/Long WENS-79.8333 -79.7167 44.3333 44.0000
Subjectsgeophysics; groundwater; boreholes; geophysical logging; digital log data; seismic profiles; seismic reflection surveys; conductivity surveys; magnetic susceptibility; seismic waves; lithology; seismic interpretations; temperature; groundwater temperatures; seismic velocities; Newmarket Till; Oak Ridges Moraine; Thorncliffe formation
ProgramGroundwater Geoscience, Aquifer Assessment & support to mapping
Released2015 08 04
Summary(Plain Language Summary, not published)
This Open File contains the results of the downhole geophysical logging conducted by the GSC in October 2014 in two unconsolidated sediment boreholes in the south Simcoe region, ON. The primary objective of this study was to measure downhole compressional (Vp) and shear wave (Vs) velocities in boreholes drilled near high-resolution seismic reflection profiles collected by the GSC in the fall of 2013. A secondary objective of the downhole surveys was to measure a range of in situ chemical and physical properties of the subsurface materials and borehole fluids. Induction (magnetic susceptibility and apparent conductivity) and natural gamma logs were used to identify variations in the sedimentary units intersected by the deep boreholes. Fluid temperature logs were collected to identify changes in temperature gradients along the boreholes.

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