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Title3D geologic and hydrogeologic modelling of the Paleozoic bedrock of southern Ontario
AuthorCarter, T R; Brunton, F R; Logan, CORCID logo; Clark, J; Fortner, L; Yeung, K; Freckelton, C; Sutherland, L; Russell, H A JORCID logo
SourceGAC-MAC 2017, abstracts/GAC-MAC 2017, résumés; Geological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 40, 2017 p. 51 Open Access
logo Open Access
LinksOnline - En ligne (complete volume, PDF, 3.09 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20200336
PublisherGeological Association of Canada
MeetingGAC-MAC 2017: Geological Association of Canada-Mineralogical Association of Canada Annual Meeting; Kingston, ON; CA; May 14-18, 2017
Mediaon-line; digital
File formatpdf
Subjectsregional geology; hydrogeology; Science and Technology; Nature and Environment; bedrock geology; groundwater; Phanerozoic; Paleozoic
ProgramGroundwater Geoscience Aquifer Assessment & support to mapping
Released2017 05 01
AbstractThis multiyear initiative will produce the first 3D model of the Paleozoic bedrock for all southern Ontario west of Frontenac Arch. Derivative outcomes include: 1) a revised lithostratigraphic chart; 2) a revised regional bedrock topography surface, including Lake Ontario; 3) QA/QC improvements in formation contacts recorded in the Ontario petroleum well database; 4) revised formation subcrop boundaries and; 5) a model of the regional occurrence of groundwater in bedrock, focussing on potable groundwater within shallow bedrock.
Preliminary 3D geologic models have been developed using LeapfrogTM Hydro implicit modelling software based principally on digital data for approximately 300,000 formation contacts from 26,700 petroleum wells, recorded in Ontario's petroleum well database. The model area covers approximately 110,000 km2, extending across southern Ontario and beneath the Great Lakes to the US border, but not Manitoulin Island. The model currently comprises 61 layers and attempts to render the bedrock topography, the Precambrian-Paleozoic contact, and the regional variability of 58 Paleozoic bedrock formations plus drift. It is a product of an ongoing, iterative process of interim modelling, model review by project geologists, and QA/QC editing of formation picks. LeapfrogTM modelling software is used to produce 3D models based upon Radial Basis Functions primarily using the formation depth picks. LeapfrogTM lends itself to iterative data QA/QC because revised data inputs can be readily reloaded without re-constructing the formation contact structure and model chronostratigraphy. With further development and improved data support, the lithostratigraphic model will be finalized to support a hydrostratigraphic model suitable for numeric modelling.
The study integrates classic outcrop/field/lab-based protocols and petroleum subsurface mapping techniques, with GIS/database queries, and digital modelling techniques. Efforts to date have focused on refining formation contacts and geographic distributions of Paleozoic formations. Project geologists have reviewed over 50,000 formation picks by examination of geophysical logs, core, and drill cuttings, and approximately 100,000 digital water well records have been reviewed. Issues resolved include: well location, formation assignment, anomalous data points, and wells with missing or incorrect formation picks. Development of the hydrostratigraphic model will incorporate data for: 35,000 water records from petroleum wells, 440,000 water well records, hydraulic conductivity measurements, karst mapping, drill core analyses, compositional analyses of produced water from petroleum wells, isotopic and compositional analyses of deep to intermediate groundwater, nearly 300 stratigraphic boreholes completed by the Ontario Geological Survey, and field observations. Additional data includes published geology, structure and isopach maps, ground surface DEM, and Great Lakes bathymetry.
Summary(Plain Language Summary, not published)
Abstract for a presentation overviewing the development of a three-dimensional geological model for Southern Ontario.

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