Downhole geophysical data from two boreholes in the south Simcoe County, Ontario

Crow, Heather; Brewer, Kevin; Bajc, A.F.; Pugin, A J M; Mulligan, R P M; Russell, H A J

doi:10.4095/296884

Cited by 1 publication

(5 citation statements)

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“…Neutron logs were collected by non-GSC personnel in 19 boreholes in the Waterloo (nine), Oro (eight), and GTA (two) study areas. All digital log data, along with logging procedures and systems, can be found in Crow et al (2015a). In the present study, natural gamma, induction, and velocity (Vp, Vs) logs were selected to characterize hydrostratigraphic unit responses as they were collected in nearly all the boreholes.…”

Section: Geophysical Logging Methodsmentioning

confidence: 99%

“…1). These boreholes were drilled predominantly in the Oak Ridges Moraine between 1993 and 2006, with an additional two boreholes near Wasaga Beach and two in south Simcoe County (Pullan et al 2002;Crow et al 2015aCrow et al , 2015b. The dominant landform in the area is the Oak Ridges Moraine, a 160 km long ridge of sediment that forms the drainage divide between Georgian Bay and Lake Ontario.…”

Section: Greater Toronto Area (Gta)mentioning

confidence: 99%

“…Analytical approaches such as cross plotting of log responses, and more recently, principal component analyses have been used in identifying material type or grain size (Pehme 1984;Karrow et al 1990;Kassenaar 1991;Pullan et al 2002;Gerrie et al 2003;Brennan 2011). It has been recognized that a key requirement for these studies is a collection of calibrated geophysical logs (Gerrie et al 2003;Crow et al 2015a).…”

Section: Previous Borehole Geophysical Studies In Southern Ontariomentioning

confidence: 99%

“…Sample logs showing elevated velocities within the Newmarket (NT) and Catfish Creek (CT) tills (light green intervals), but relatively low and unvarying lithological log responses. Sediment descriptions from Crow et al (2015a) and Bajc and Hunter (2006). region, and similarly, the mean Vs is 15%-45% higher.…”

Section: High-velocity Tillsmentioning

confidence: 99%

“…Over the past two decades, a standard suite of logs including natural gamma, apparent conductivity, magnetic susceptibility, and compressional (P) and shear (S) wave velocities has been collected by the Geological Survey of Canada (GSC) in 226 cased wells across Canada (Crow et al 2015a). In southern Ontario, 57 polyvinyl chloride (PVC) cased wells were sampled and geophysically logged (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Borehole geophysical log signatures and stratigraphic assessment in a glacial basin, southern Ontario

et al. 2018

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Over the past two decades, the Geological Survey of Canada has used a standardized suite of slim-hole geophysical tools to log 57 polyvinyl chloride cased boreholes drilled in the glacial sediments of southern Ontario. This article documents downhole tool responses (natural gamma, apparent conductivity, magnetic susceptibility, and seismic velocity) in the context of mineralogical characteristics of the region and grain-size data from 28 of the 57 boreholes. Characteristic geophysical properties and (or) patterns are identified within the units of a regional hydrostratigraphic framework in southern Ontario. The importance of a calibrated suite of tools is emphasized, as stratigraphic units may have variable response from site to site. The use of a high-sensitivity magnetic susceptibility induction probe is shown to be an important tool in the log suite for lithostratigraphic interpretation, and more broadly, for provenance studies of source rock across the region. Ranges of compressional (P) and shear (S) wave velocities and their ratios are provided for each of the hydrostratigraphic units. Case studies are presented to demonstrate how logs may assist in the interpretation of glacial processes at lithological boundaries.

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Section: Geophysical Logging Methodsmentioning

confidence: 99%

Section: Greater Toronto Area (Gta)mentioning

confidence: 99%