|Title||Quartzose sands in the Lower to Middle Devonian strata of southwestern Ontario: geographic distribution and characterization in drill cuttings and geophysical logs|
|Author||Davis, C L|
|Source||Geological Survey of Canada, Open File 8286, 2017, 37 pages, https://doi.org/10.4095/305359 (Open Access)|
|Publisher||Natural Resources Canada|
|NTS||30L; 30M/03; 30M/04; 30M/05; 30M/12; 40G; 40I; 40J; 40O; 40P; 41A/03; 41A/04; 41B/01; 40I; 40J|
|Lat/Long WENS|| -83.2500 -79.0000 44.2500 41.5000|
|Subjects||stratigraphy; sedimentology; hydrogeology; geophysics; bedrock geology; lithology; sedimentary rocks; sandstones; stratigraphic analyses; systematic stratigraphy; stratigraphic nomenclature;
stratigraphic models; lithofacies; geophysical logging; gamma ray logging; density logging; neutron well logging; gas wells; oil wells; microscopic analysis; grain size analyses; petrographic analyses; modelling; groundwater resources; depositional
environment; Lucas Formation; Columbus Sandstone; Sylvania Formation; Oriskany Formation; Bois Blanc Formation; Springvale Member; Detroit River Group; Michigan Basin; Appalachian Basin; Findlay Arch; Algonquin Arch; Ontario Petroleum Data System
(OPDS); Dundee Formation; quartzose; drill cuttings; geological mapping; data quality; porosity logging; sonic logs; Phanerozoic; Paleozoic; Devonian|
|Illustrations||tables; geological sketch maps; stratigraphic charts; location maps; photomicrographs; geophysical logs; photographs|
|Program||Aquifer Assessment & support to mapping, Groundwater Geoscience|
|Released||2017 08 30|
|Abstract||Southern Ontario is underlain by up to 1425 metres of Paleozoic sedimentary rocks unconformably overlying a Precambrian basement complex of metamorphic and igneous rocks. Four distinct quartzose
sandstone units occur within the Middle to Lower Devonian succession: the Columbus sand lithofacies of the Lucas Formation, the Sylvania Formation, the Springvale Member of the Bois Blanc Formation, and the Oriskany Formation. All of the sands form
continuous to discontinuous beds and lenses within thick accumulations of regional limestones and dolostones. Locally, these sands are significant hosts of groundwater, oil, and/or gas due to their enhanced porosity relative to the confining
Information from petroleum wells drilled since the last time these sands were mapped (Bailey and Cochrane, 1985), combined with a comprehensive update of Ontario's petroleum well database, have been used to re-examine the distribution
and characterization of these sands. In this study, over 1300 wells containing Devonian-aged strata were examined using binocular microscopy of drill cuttings, geophysical well log analysis, and Geographic Information System (GIS) queries of the
Ontario Petroleum Data System (OPDS) petroleum well database. Geographic extents of all four sands have been updated, with sands identified in areas not previously documented. In other cases, stratigraphic assignments were corrected. Petrographic
characteristics of the sands, as viewed in cuttings samples, have been documented. Over 800 formation/member top picks have been added or edited, and over 200 picks were identified as erroneous and have been deleted from the petroleum well database.
The revised data has been incorporated into an ongoing and broader project to construct a 3D model of the geology and hydrogeology of the Paleozoic bedrock of southern Ontario.
|Summary||(Plain Language Summary, not published)|
Documents data corrections to the Ontario Petroleum Oil Gas and Salt Resources Library. The work was completed on the Devonian sands and involved the
correction of the identification of the formation top from geophysical logs and well cuttings.