|Title||A regional 3-D geologic model of the Paleozoic bedrock of southern Ontario|
|Author||Carter, T R; Brunton, F R; Clark, J; Fortner, L; Logan, C; Russell, H A J; Somers, M; Sutherland, L; Yeung, K|
|Source||RFG 2018, Vancouver, BC, Canada, abstract volume; .|
|Alt Series||Natural Resources Canada, Contribution Series 20170336|
|Meeting||RFG 2018 - Resources for Future Generations; Vancouver, BC; CA; June 17-21, 2018|
|Media||paper; on-line; digital|
|Program||Aquifer Assessment & support to mapping, Groundwater Geoscience|
|Abstract||A regional 3-D geological model of the Paleozoic bedrock of southern Ontario is under development, to be completed in late 2018. The model encompasses the entire Phanerozoic succession of south-central
and south¿western Ontario (110,000 km2), comprised of up to 1400 metres of relatively undeformed sedimentary strata straddling regional arches/forebulge zones separating the Appalachian Foreland Basin from the Laurentian craton and Michigan
Structural Basin. This ambitious initiative provides an unprecedented regional 3-D perspective and digital framework to support investigations and decision-making related to resource exploration, hydrogeological and environmental investigation,
education, resource management and land-use planning. It is amenable to numeric modelling and provides regional context for site-specific investigations. |
Model construction of the sedimentary basin is guided by a updated regional
lithostratigraphic chart and paleogeographic understanding. Model construction utilizes Leapfrog Hydro© - an implicit modelling application. Layers representing 58 formations are constructed using top-bottom formation depths from 20,221 borehole
records in Ontario¿s public petroleum well database (www.ogsrlibrary.com). This primary data input is supplemented by Ontario Geological Survey (OGS) deep boreholes. An OGS digital bedrock topography surface is combined with a revised subcrop geology
map to assemble a grid of 3-D points that approximate the subcrop surface of each formation. The modern topographic surface is integrated using SRTM DEM data, NOAA lake bathymetry and Canadian Hydrographic data for smaller lakes. These, along with
digitized 3-D surface polyline and point constraints, are used to better align the modelled layers. Manual editing has been critical to resolving inaccurate thickness extrapolations, gaps in layers, missing/inaccurate formation depth data,
obsolete/inconsistent stratigraphic assignments, anomalous outliers, and layer truncation issues at the cuesta/escarpment margins.
Model development is an iterative cycle of interim modelling, expert geological appraisal, and editing of geological
data using geophysical logs, drill cuttings/core resulting in a revised dataset and improvements to the petroleum well database. Data integrity and model construction have improved such that the current model (version 6) will provide a geologically
robust representation of the regional bedrock geology.
|Summary||(Plain Language Summary, not published)|
Presentation on the development of a 3D geological model for Southern Ontario bedrock.