Metadata: 3D hydrostatigraphic model of the Southeastern Quebec fractured aquifer system (AFSOQ)

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Identification

Abstract

During a regional hydrogeologic survey in the St. Lawrence Lowlands, Canada, a computer-based 3D Geologic Framework Model (GFM) was constructed to obtain a consistent representation of this typical Quaternary glaciated basin over a 1,400 km2 area. Such a detailed stratigraphic reconstruction was needed because the Quaternary sediments control the recharge to the underlying regional fractured rock aquifer and also because buried granular aquifers are partly connected to the regional system. The objectives of this geomodeling effort are 1) to improve understanding of subsurface conditions above the regional aquifer and; 2) to provide a common stratigraphic framework for hydrogeologic applications. The method draws on knowledge-driven discrete modeling using Gocad®, as well as standardization and quality control procedures to maximize the use of a multisource database. The resulting model represents the bedrock topography and the complex stratigraphic architecture of overlying sediments. The regional till aquitard, the marine clay aquiclude and the buried granular aquifers have been modeled with unprecedented details thus providing a well-constrained 3D hydrostratigraphic framework.
Status:register completed
Title3D hydrostatigraphic model of the Southeastern Quebec fractured aquifer system (AFSOQ)
Date2004-01-01 (register publication)
Date2004-01-01 (register creation)
Edition
Edition date
Citation group
register pointOfContact
Name
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada
Position
Information
AddressDelivery point :
City :
Administrative region :
Postal code :
Country :
Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
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Citation group
register principalInvestigator
NameMichel Parent
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec
Position
Information
AddressDelivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage
City : Québec Québec
Administrative region : Québec Québec
Postal code :
Country : Canada Canada
Email michel.parent@canada.ca
Telephonetelephone voice; 1 (418) 6542657
Online Resource
Citation group
register originator
NameMartin Ross
OrganisationInstitut national de la recherche scientifique
Positiongeologist
Information
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Email
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Citation group
register custodian
NameFrancois Letourneau
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec
Position
Information
AddressDelivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage
City : Québec Québec
Administrative region : Québec Québec
Postal code :
Country : Canada Canada
Email francois.letourneau@canada.ca
Telephonetelephone voice; 1 (418) 6543826
Online Resource
Presentation formregister modelDigital
Series

Related publication

  • Ross, Martin (2004) Stratigraphie et architecture des formations quaternaires au nord-ouest de Montréal: applications en hydrogéologie régionale. Ph.D. Thesis. Earth Sciences, Institut national de la recherche scientifique, Québec, Canada. 305 p. Ross, M., Parent, M., Lefebvre, R. (2004) 3D geologic framework models for regional hydrogeology and land-use management: a case study from a Quaternary basin of southwestern Quebec, Canada. Hydrogeology Journal, 13, 690-707. Savard, M M (ed.), 2013. Inventaire canadien des ressources en eau souterraine : Caractérisation hydrogéologique régionale et intégrée du système aquifère fracturé du sud-ouest du Québec; Geological Survey of Canada, Bulletin no. 587, 117 pages.

Goals

The main objective is to develop and integrate regional Quaternary knowledge in a geomodeling process in order to create a 3D Quaternary regional model. This model could be the basis of many subsequent studies, particularly in hydrogeology.

Keyword(s)

Thesaurus
TitleGovernment of Canada Core Subject Thesaurus
Date2004 (register creation)
Date2013-05-11 (register publication)
Edition
Edition date
Citation group
register custodian
Name
OrganisationGovernment of Canada; Library and Archives Canada
Position
Information
Typeregister
TermHydrogeology
Thesaurus
TitleNRCan - GSC - Hydrogeology - Thesaurus
Date2009-01-01 (register creation)
Edition
Edition date
Citation group
register pointOfContact
Name
OrganisationCommission Géologique du Canada - Geological Survey of Canada
Position
Information
Typeregister produit
Term3D Model
Thesaurus
TitleNRCan - GSC - Hydrogeology - Thesaurus
Date2009-01-01 (register creation)
Edition
Edition date
Citation group
register pointOfContact
Name
OrganisationCommission Géologique du Canada - Geological Survey of Canada
Position
Information
Typeregister thème
TermAquifer system
Thesaurus
TitleNRCan - GSC - Hydrogeology - Thesaurus
Date2009-01-01 (register creation)
Edition
Edition date
Citation group
register pointOfContact
Name
OrganisationCommission Géologique du Canada - Geological Survey of Canada
Position
Information
Typeregister thème
TermGroundwater
Thesaurus
TitleNRCan - GSC - Hydrogeology - Thesaurus
Date2009-01-01 (register creation)
Edition
Edition date
Citation group
register pointOfContact
Name
OrganisationCommission Géologique du Canada - Geological Survey of Canada
Position
Information
Typeregister endroit
TermSouthwestern Quebec
Thesaurus
TitleNRCan - GSC - Hydrogeology - Thesaurus
Date2009-01-01 (register creation)
Edition
Edition date
Citation group
register pointOfContact
Name
OrganisationCommission Géologique du Canada - Geological Survey of Canada
Position
Information
Typeregister thème
TermQuaternary
Spatial representationregister vector
Languagefra; CAN
Character encodingutf8
Thematic categorygeoscientificInformation
ExtentLocalisation
-74.667000000,45.417000000;-73.667000000,45.917000000
Supplemental information

Distribution

Specific information related to data distribution
Format
NameGOCAD Model
Versionnot applicable

Distributor

Contact
register pointOfContact
Name
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada
Position
Information
AddressDelivery point :
City :
Administrative region :
Postal code :
Country :
Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource

Distributor

Contact
register distributor
NameEric Boisvert
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec
Position
Information
AddressDelivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage
City : Québec Québec
Administrative region : Québec Québec
Postal code :
Country : Canada Canada
Email eric.boisvert2@canada.ca
Telephonetelephone voice; 1 (418) 6543705
Online Resource

Transfer options


Quality


Quality description scope :register dataset

Lineage

Message Date lineage
Lineage is the description of the sources and steps used to create the current dataset.


Introduction
Process step Sources
The units that were modeled in the 3D models are: At: Low terrace alluvial sediments, sand, upper aquifer. Ax: High terrace alluvial sediments, sand, upper aquifer. Lb: Lacustrine littoral sediments, sand, upper aquifer. Mb: Marine sublittoral and littoral sediments, sand, upper aquifer. Ma: Fine-grained marine offshore sediments, Champlain Sea silt and clay, aquiclude. Gx: Glaciofluvial ice-contact sediments, aquifer. T: Late Wisconsinian regional undifferentiated till, aquitard. Q: Undifferentiated Pleistocene sediments underlying the regional till, small buried aquifers. R: Undifferentiated bedrock, regional aquifer.
Quaternary geology map. Stratigraphic wells. Archival boreholes.
Prior to the construction of the3D model surfaces, one of the most challenging aspects of the modeling task was to adequately correlate borehole attributes to a given stratigraphic unit. Since the known composite stratigraphic sequence is usually incomplete at most sites, correlations must be made carefully. More than 40 cross sections were built to form the basis of the 3D framework. A discrete modeling approach was chosen to construct the geologic model. The 3D geomodeling system Gocad® was used to carry out this part of the work. The surfaces can be built first with non-standardized borehole data to provide quick maps in support of decision-making in the early stages of an investigation and be modified as validation results and new data become available. As more data are added, evaluated and corrected, the surfaces are better constrained and become increasingly accurate. Cross section and geological map contacts are used here as the main expert knowledge constraints, but other constraints were also applied to take into account reliable data between cross sections in order to increase the accuracy of interpolated surfaces. These include topographic data, small outcrops, curves from interpreted seismic profiles, and contacts from boreholes. Since building surfaces separately does not ensure that they are consistently in the correct stratigraphic order away from cross sections, increased mesh density and minimum thickness constraints were applied locally to remove most crossovers. The remaining crossovers were removed manually by adjusting triangle nodes but in many cases, discontinuities were created. Therefore, surfaces are not regionally modified on the basis of a reference layer. The interlocked surfaces are intended to form closed volumes representing geologic bodies. The surfaces thus act as ""dividing walls"" isolating 3D regions (Mallet 2002). In order to achieve this, many improvements were applied along surface intersections. Further discretization was also applied using advanced gridding tools that allow the construction of curvilinear regular 3D grids which conform to the stratigraphic architecture.
Quaternary geology map. Cross-sections. Stratigraphic wells. Geophysical data. Archival boreholes.


Technical details and constraints

File identifier59814394-1ae3-3ace-c829-ea4db4064848
Languageeng; CAN
Character encodingregister utf8
Hierarchical classificationregister dataset
Date2017-03-24
Metadata standardNorth American Profile of ISO 19115:2003 - Geographic information - Metadata
VersionCAN/CGSB-171.100-2009
Constraints
Update frequencyregister asNeeded

Regionalisation

Metadata are available in those languages (You can use language menu item in the top menu bar to switch language):
Language code Pays Encodage
register Frenchregister Canadaregister utf8

Geographic Reference System

Reference System codeEPSG:26918
Registerhttp://www.epsg-registry.org/
Version6.14

Metadata Contact

register pointOfContact
Name
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada
Position
Information
AddressDelivery point :
City :
Administrative region :
Postal code :
Country :
Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource
register pointOfContact
NameFrancois Letourneau
OrganisationGovernment of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec
Position
Information
AddressDelivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage
City : Québec Québec
Administrative region : Québec Québec
Postal code :
Country : Canada Canada
Email francois.letourneau@canada.ca
Telephonetelephone voice; 1 (418) 6543826
Online Resource