|Title||A three-dimensional geological model of the Paleozoic bedrock of southern Ontario|
|Author||Carter, T R; Brunton, F R; Clark, J K; Fortner, L; Freckelton, C; Logan, C E; Russell, H A J; Somers, M; Sutherland, L; Yeung, K H|
|Source||Geological Survey of Canada, Open File 8618, 2019, 45 pages, https://doi.org/10.4095/315045 (Open Access)|
|Alt Series||Ontario Geological Survey, Groundwater Resources Study 19|
|Publisher||Natural Resources Canada|
|Publisher||Government of Ontario|
|File format||pdf (Adobe® Reader®); rtf; csv; dxf (Logiciel AutoCAD software)|
|NTS||30; 31C/01; 31C/02; 31C/03; 31C/04; 31C/05; 31C/06; 31C/07; 31C/08; 31C/09; 31C/10; 31C/11; 31C/12; 31C/13; 31D; 31E/02; 31E/03; 31E/04; 31E/05; 40; 41A; 41B/01; 41B/08; 41B/09; 41B/16; 41G/01; 41G/08;
41H/01; 41H/02; 41H/03; 41H/04; 41H/05; 41H/06; 41H/07; 41H/08|
|Lat/Long WENS|| -83.2500 -76.3333 45.3333 41.5000|
|Subjects||regional geology; stratigraphy; hydrogeology; Nature and Environment; Science and Technology; bedrock geology; basement geology; lithology; sedimentary rocks; sandstones; evaporites; salt; anhydrite;
carbonates; limestones; dolostones; shales; lithostratigraphy; bedrock topography; groundwater regimes; groundwater resources; models; software; boreholes; oil wells; gas wells; stratigraphic analyses; stratigraphic nomenclature; St. Lawrence
Lowlands; Leapfrog© Works; Ontario Petroleum Data System; Port Lambton Group; Kettle Point Formation; Hamilton Group; Marcellu Formation; Dundee Formation; Lucas Formation; Onondaga Formation; Detroit River Group; Columbus Formation; Amherstburg
Formation; Sylvania Formation; Bois Blanc Formation; Springvale Formation; Oriskany Formation; Bass Islands Formation; Bertie Formation; Salina Group; Lockport Group; Guelph Formation; Eramosa Formation; Goat Island Member; Gasport Member; Clinton
Group; DeCew Formation; Rochester Formation; Lion's Head Formation; Irondequoit Formation; Rockway Formation; Fossil Hill Formation; Reynales Formation; St. Edmund Formation; Wingfield Formation; Dyer Bay Formation; Neahga Formation; Medina Group;
Thorold Formation; Grimsby Formation; Cabot Head Formation; Manitoulin Formation; Whirlpool Formation; Queenston Formation; Georgian Bay Formation; Blue Mountain Formation; Trenton Group; Cobourg Formation; Sherman Fall Formation; Kirkfield
Formation; Black River Group; Coboconk Formation; Gull River Formation; Shadow Lake Formation; Niagara Escarpment; Algonquin Arch; Findlay Arch; Frontenac Arch; Appalachian Basin; Michigan Basin; Chatham Sag; geological mapping; 3-D modelling;
databases; formation tops; digital elevation models; quality control; well data; Phanerozoic; Cenozoic; Quaternary; Paleozoic; Devonian; Silurian; Ordovician; Cambrian|
|Illustrations||geoscientific sketch maps; stratigraphic charts; models; location maps; flow diagrams; 3-D models; screen captures; tables|
Aquifer Assessment & support to mapping|
|Released||2019 11 26|
|Abstract||A regional three-dimensional (3-D) lithostratigraphic model of the Paleozoic bedrock of southern Ontario has been completed. The model encompasses the entire Phanerozoic succession of southern Ontario
(110 000 km2), consisting of over 1500 m of sedimentary strata straddling regional arch, or forebulge, zones separating the Appalachian foreland basin from the Michigan structural basin. This initiative provides an unprecedented regional 3-D
perspective and digital framework based on an updated regional lithostratigraphic chart. Constructed using Leapfrog® Works, an implicit modelling software application, the model format can readily support numeric groundwater-flow modelling.
Fifty-four Paleozoic bedrock layers representing 70 formations, as well as the Precambrian basement and overlying unconsolidated sediment, were modelled at a spatial resolution of 400 m. Borehole records in Ontario's public petroleum well
database (Ontario Petroleum Data System (OPDS)) were the principal data source, supplemented by Ontario Geological Survey (OGS) deep boreholes, measured sections, control points and Michigan boreholes. A newly revised digital bedrock topography
surface combined with revised subcrop geology and digitized 3-D surface polyline and point constraints were used to better align the modelled layers and their extrapolation to the subcrop surface. Model development was an iterative cycle of interim
modelling, expert geological appraisal, and quality assurance and control (QA/QC) editing of geological data using geophysical logs, drill cuttings and core, supplemented by manual editing of model layers. The 3-D model provides a robust
representation of regional bedrock geology.
A properly constructed borehole database and its supporting information is an essential requirement for construction of a 3-D model, but data errors, inconsistencies, data gaps, location errors, etc.
can compromise the reliability of the model. From 2015 to 2018, project geologists and geological contract staff of the Oil, Gas and Salt Resources Library completed edits to 30 320 formation tops in a total of 7812 wells, resulting in a revised data
set and permanent improvements to the petroleum well database. This report highlights the importance of QA/QC of well data, specifically formation top identification, and summarizes the data improvements made in support of the present 3-D model. No
seismic data was available.
|Summary||(Plain Language Summary, not published)|
Publication of a regional three-dimensional geological model of the Paleozoic bedrock of southern Ontario. The model encompasses the entire bedrock
succession of southern Ontario (110,000 km2).