Metadata: 3D hydrostatigraphic model Quebec City area

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Identification

Abstract

This thesis is part of a joint effort between the Geological Survey of Canada (GSC-Québec) and the Institut national de la recherche scientifique, Centre Eau Terre Environnement (INRS-ETE) to establish a three-dimensional geological model of surficial formations in the region of Quebec City. The construction of a 3D geological model allowed reconstituting, in a coherent way, the different combinations of quaternary geological units in the study region. The integration of archival and new data made it possible to clarify the architectural complexity of the sediments in the buried valley of Quebec City lower town and surroundings. The bottom of the observed stratigraphic sequence consists of a lower till and overlying lower marine sand. The upper till overlying these sands represents the main phase of the Laurentian glaciation in the Quebec City area. Marine clayey silts overly the till and are mainly present in the various topographic depressions, as well as large deltaic complexes at the main river mouths. In Quebec City lower town, a late delta was the subject of a preliminary hydrogeological analysis. The thickness and extent of this delta make it an important aquifer, with the potential to be exploited both for water and geothermal energy.
Status:register completed
Title3D hydrostatigraphic model Quebec City area
Date2011-01-01 (register publication)
Date2011-01-01 (register creation)
Edition
Edition date
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
NameLise Lamarche
OrganisationInstitut national de la recherche scientifique, INRS Centre Eau Terre Environnement
Position
Information
Address
Telephone
Online Resource
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
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
Telephone
Online Resource
Presentation formregister modelDigital

Related publication

  • Lamarche, Lise (2011) Évolution paléoenvironnementale de la dynamique quaternaire dans la région de Québec: Application en modélisation tridimensionnelle et hydrogéologique. Ph.D. Thesis. Earth Sciences, Institut national de la recherche scientifique, Québec, Canada. 222 p.

Goals

The primary goal of 3D geological modeling is to define the spatial boundaries of the various hydrostatigraphic units in the context of a preliminary hydrogeological study, in particular of the delta of Quebec City lower town. The three-dimensional geological modeling makes it possible to constrain the interpolation of the hydraulic properties inside the various hydrofacies.

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 product
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 theme
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 theme
TermQuaternary
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 place
TermQuebec City area
Spatial representationregister vector
Languagefra; CAN
Character encodingutf8
Thematic categorygeoscientificInformation
ExtentLocalisation
-71.800000000,46.667000000;-70.950000000,47.010000000
Supplemental information

Distribution

Specific information related to data distribution
Format
NameGOCAD Model
Versionnot applicable

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

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

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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
3D model creation Stratigraphy definition
Process step Sources
The type, format and reliability of the data variable and require preliminary processing before the data are integrated into the modeling software. The multitude of data sources requires an assessment of the reliability of the data and standardization of these data (Ross et al., 2005). The well data position and the depth of the various units are integrated into the 3D geological model using a 2D cross-section approach. The geological units were interpreted and drawn on each of the cross-sections and are later integrated in Gocad®. The geophysical data interpretations are validated or modified using wells located near the surveys. Integration of data in the 3D model is done by the application of constraints on the geological unit surfaces. There are 2 types of constraints frequently used, either soft or strict constraint. Strict constraints are used when data are positioned with acceptable accuracy in the 3 axes (XYZ), for example, well markers with maximum reliability. Soft constraints are used when there is uncertainty about the position of the data, but the information related to this data provides additional information on the subsurface geometry of a unit. Similarly, if the interpretation of a thin unit on the geological map indicates that the second unit is located at shallow depth, a soft thickness constraint can be applied to the underlying unit. The interpolation method used is Gocad® Discrete Smooth Interpolation (DSI), which minimizes the surface slope tangent (Mallet, 2002). The constructed surfaces represent the upper contact of the various geological units. A 3D mesh (voxet) of 250m x 250m x 2m was built over the entire study area. The distribution of the cells associated with the units in the different regions of the 3D model is realized as follows: 1) the region corresponding to each of the geological units is constructed by selecting all the cells located beneath the modeled surface representing the upper limit of the unit; 2) subtraction of the cells corresponding to the underlying units is performed. The construction is thus realised in stratigraphic order, from the bottom (older units) to the top (younger units).
There are different sources of sub-surface data. Direct data are associated with markers from different wells, surface observations or geological cross-sections in the field, while indirect measurements are generally derived from geophysical surveys whose parameters can be related to the physical or mechanical properties of the sediments.
The modeled geological units are presented in stratigraphic order, from the bottom (older) upward (more recent). Bedrock (R): undifferentiated. Lower glacial sediments (Ts): Old compact till with a thickness varying between 1 and 5 m, characterized by a gravelly diamicton with contiguous clasts. Old quaternary sediments (Q): Undifferentiated old quaternary sediments have been preserved in several valleys and can reach a thickness of several tens of meters. Upper glacial sediments (Ti): Till in quasi-continuous coverage over the entire study area. This unit may exceed 30 m in thickness. Undifferentiated glaciofluvial sediments (G): A set of subaerial and subaqueous outwash fan and ice contact facies. They are composed of a heterogeneous combination of sand and gravel with silty sand and even diamicton. Because these 3 types of sediments cannot be distinguished from one another in wells, they were grouped together for the purpose of 3D geological modeling. Their thickness can reach 40 m at the esker in the north of Valcatier. Glaciolacustrine deltaic sediments (Ld): With a thickness of less than 20 m, these sediments overly the glaciofluvial sequence in the area of the Montmorency river valley. Glaciomarine offshore fin sediments (Ma): Deep marine sediments consist mainly of clayey silt or silty clay deposited in topographic depressions. With a thickness of up to 50 m in wells, these clays constitute an aquitard underlying the Quebec aquifer. Glaciomarine intertidal sediments (Mi): Sediments consisting of silt and sandy silt and deposited in an intertidal or subtidal zone in sheltered bays or inlets. Thickness of 0.5 to 15 m. Glaciomarine deltaic and prodeltaic sediments (Md): Sands, gravelly sands and gravels that have all the sedimentological characteristics of a classic delta. Thickness up to 50 m. Glaciomarine littoral and nearshore sediments (Mb): Sand, sandy silt, gravelly sand and gravel with a thickness varying from 0.5 to 5 m. These sediments generally form a thin cover over the fine offshore sediments. Late glaciomarine coarse deltaic sediments (Md_gBV): Gravelly sand unconformably overlying the glaciomarine unit in the southern part of the model, in Quebec City lower town. Thickness from 1 to 5 m. Late glaciomarine deltaic sediments (Md_BV): Medium-grained deltaic sands with a thickness of more than 30 m upstream of the Saint-Charles River. Alluvial early fluvial terrace sediments (Ax): A unit composed of sand, sandy silt or gravel sometimes containing fragments of plants and deposited in areas overflowing the present river corridors. Thickness between 1 and 5 m. Early estuarine sediments (AT_sup_delta): A unit composed of silt, sandy silt, sand generally containing fragments of terrestrial and aquatic plants. Average thickness of 3 or 4 m, but varying from 2 to 10 m. Alluvial fluvial terrace sediments (At): A unit consisting of a varied set of sand, sandy silt, gravelly sand and gravel facies frequently containing plant fragments. Generally of small thickness (less than 3 m), this unit is located near the current rivers. Recent alluvial sediments (Ap): Located in the present river floodplains, the sediments are characterized by a heterogeneous composition of facies. These sands, sandy silts, gravelly sands and gravel often containing fragments of plants have a thickness of less than 3 m. Organic Sediment (O): Found in poorly drained depressions throughout the area. Generally of small thickness, they can nevertheless reach a thickness of 4 m. Characterized by peat soil; this unit is often located at the edge of a water body. Embankment, anthropogenic sediments (X): Significant anthropogenic significantly altered the natural landscape activities in the study area. Thus, the riverside of the St. Charles River, as well as those of the St. Lawrence River, have been greatly modified and their banks have been largely artificialized. It is possible to observe heterogeneous embankment deposits over a thickness of more than 20 m in the port of Quebec area.
Surficial geological map. Field observations. Geophysical surveys. Rotosonic well.


Technical details and constraints

File identifierbe49f04e-cd37-015e-b245-8fd086b3a605
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:26919
Registerhttp://www.epsg-registry.org/
Version6.14

Metadata Contact

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
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