AGS_Information:

  Identification_Information:

    Citation:

      Citation_Information:

        Originator: Alberta Energy Regulator

        Originator: Alberta Geological Survey

        Originator: Nakevska, N.

        Publication_Date: 2026

        Title: Distribution of Total Dissolved Solids in the Gilwood Member (Watt Mountain Formation) in Alberta(gridded data, ASCII format)

        Geospatial_Data_Presentation_Form: raster digital data

        Series_Information:

          Series_Name: Digital Data

          Issue_Identification: DIG 2025-0019

        Publication_Information:

          Publication_Place: Edmonton, Alberta, Canada

          Publisher: Alberta Geological Survey

        Online_Linkage: https://ags.aer.ca/publications/all-publications/dig-2025-0019

    Description:

      Abstract: This grid represents the distribution of total dissolved solids (TDS) in the Gilwood Member (Watt Mountain Formation) in Alberta. The grid is a result of a geostatistical model constructed using formation water chemistry data from oil and gas well drillstem tests. The TDS distribution was mapped at a regional scale using many years of data, thus providing a good indication of regional water chemistry within the Gilwood Member rather than site-specific values.

      Purpose: To provide a gridded dataset representing the distribution of total dissolved solids in the Gilwood Member (Watt Mountain Formation) in Alberta.

      Supplemental_Information: Language: In English;

    Time_Period_of_Content:

      Time Period Information:

        Single Date/Time:

          Calendar_Date: 2010

    Currentness_Reference: ground condition

  Status:

    Progress: Complete

    Maintenance_and_Update_Frequency: None planned

  Spatial Domain:

    Bounding Coordinates:

      West_Bounding_Coordinate: -119.7886

      East_Bounding_Coordinate: -114.0572

      North_Bounding_Coordinate: 57.6636

      South_Bounding_Coordinate: 53.7868

  Keywords:

    Theme:

      Theme_Keyword_Thesaurus: ISO 19115 Topic Category

      Theme_Keyword: formation waters

      Theme_Keyword: gilwood member

      Theme_Keyword: hydrogeology

      Theme_Keyword: total dissolved solids

      Theme_Keyword: watt mountain formation

    Place:

      Place_Keyword_Thesaurus: ISO 19115 Topic Category

      Place_Keyword: alberta

      Place_Keyword: canada

      Place_Keyword: northwestern alberta

      Place_Keyword: west-central alberta

      Place_Keyword: western canada sedimentary basin

  Access_Constraints: Public

  Use_Constraints: Acknowledgement of the Alberta Energy Regulator / Alberta Geological Survey as the originator/source of this information is required as described in the Open Government License - Alberta.

  Point_of_Contact:

    Contact_Information:

      Contact_Organization_Primary:

        Contact_Organization: Alberta Geological Survey

        Contact_Person: AGS Information Manager

      Contact_Position: AGS Information Manager

      Contact_Address:

        Address_Type: mailing and physical

        Address: Alberta Energy Regulator

        Address: 2nd Floor, Twin Atria Building

        Address: 4999-98 Avenue NW

        City: Edmonton

        State_or_Province: Alberta

        Postal_Code: T6B 2X3

        Country: Canada

      Contact_Voice_Telephone: (780) 638-4491

      Contact_Facsimile_Telephone: (780) 422-1459

      Contact_Electronic_Mail_Address: AGS-Info@aer.ca

      Hours_of_Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.

  Cross_Reference:

    Citation_Information:

      Originator: Alberta Energy Regulator

      Originator: Alberta Geological Survey

      Originator: Nakevska, N.

      Publication_Date: 2025

      Title: Distribution of Total Dissolved Solids in the Gilwood Member (Watt Mountain Formation) in Alberta (tabular data, tab-delimited format)

      Geospatial_Data_Presentation_Form: tabular digital data

      Series_Information:

        Series_Name: Digital Data

        Issue_Identification: DIG 2025-0013

      Publication_Information:

        Publication_Place: Edmonton, Alberta, Canada

        Publisher: Alberta Geological Survey

      Online_Linkage: https://ags.aer.ca/publications/all-publications/dig-2025-0013

Data_Quality_Information:

  Attribute_Accuracy:

    Attribute_Accuracy_Report: The following statistics describe the accuracy of the geostatistical layer used to create the final grid.

Northern area

Mean error: -445.7 mg/L

Root mean square error: 17 067 mg/L

Average standard error: 21 072 mg/L

Root mean square standardized: 0.9

Southern area

Mean error: 706.3 mg/L

Root mean square error: 12 229 mg/L

Average standard error: 11 742 mg/L

Root mean square standardized: 1.1

  Logical_Consistency_Report: Grid cell values represent total dissolved solids concentration in mg/L. Grid cell spacing is 500 metres by 500 metres. Grid cells with no data are assigned the value -9999.

  Completeness_Report: The final grid was clipped to the spatial extent of the data within the Gilwood Member.

  Positional_Accuracy:

    Horizontal_Positional_Accuracy:

   Horizontal_Positional_Accuracy_Report: See AGS DIG 2025-0013 (data points) for details on the horizontal accuracy of the input point data, which is affected by the locational accuracy of the wells.

    Vertical_Positional_Accuracy:

   Vertical_Positional_Accuracy_Report: See AGS DIG 2025-0013 (data points) for details on the horizontal accuracy of the input point data, which is affected by the locational accuracy of the wells.

  Lineage:

    Source_Information:

      Source_Citation:

        Citation_Information:

          Originator: Alberta Energy Regulator

          Originator: Alberta Geological Survey

          Originator: Nakevska, N.

          Publication_Date: 2025

          Title: Distribution of Total Dissolved Solids in the Gilwood Member (Watt Mountain Formation) in Alberta(gridded data, ASCII format)

          Geospatial_Data_Presentation_Form: raster digital data

          Series_Information:

            Series_Name: Digital Data

            Issue_Identification: DIG 2025-0019

          Publication_Information:

            Publication_Place: Edmonton, Alberta, Canada

            Publisher: Alberta Geological Survey

          Online_Linkage: https://ags.aer.ca/publications/all-publications/dig-2025-0019

   Source_Scale_Denominator:

   Type_of_Source_Media: online

        Source Time Period of Content:

          Time Period Information:

            Single Date/Time:

       Calendar_Date: 2025

     Source_Currentness_Reference: publication date

     Source_Citation_Abbreviation: DIG 2025-0013

     Source_Contribution: Calculated total disolved solids data

    Process_Step:

   Process_Description: The selection criteria and the final dataset used for interpolation of this grid are documented in the metadata for AGS DIG 2025-0013. The TDS distribution grid for the Gilwood Member was created by applying different interpolation methods for the northern and southern areas and merging the resulting rasters using the Mosaic Rasters function in ArcGIS Pro . Data in the northern area were interpolated using empirical Bayesian kriging, while a simple kriging algorithm was applied in the southern area.

Method Report (northern area):

Output surface type: Prediction

Semivariogram type: Power

Neighbourhood type: standard circular

Maximum neighbours; 8

Minimum neighbours: 8

Sector type: 4 sectors

Method Report (southern area):

Output surface type: Prediction

Transformation type: Normal score

Decluster: True (polygonal)

Order of trend removal: First

Function type: Semivariogram

Type: Circular

Neighbourhood type: smooth

Smoothing factor: 0.1

The final surface was clipped to the estimated extent of the Gilwood Member. In data-sparse areas, interpolation was extended where TDS trends remained geologically reasonable.

   Process_Date: 2025

  Data_Quality_Information:

Spatial_Data_Organization_Information: Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 885

Column_Count: 713

Spatial_Reference_Information: Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD_1983_Transverse_Mercator

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9992

Longitude_of_Central_Meridian: -115.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.0

False_Northing: 0.0

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

Semi-Major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information: Entity_and_Attribute_Overview: Grid cell values represent the TDS concentration, expressed as mg/L, in the Gilwood Member (Watt Mountain Formation) in Alberta. Values are floating point data type.

  Distribution_Information:

    Distributor:

      Contact_Information:

        Contact_Organization_Primary:

          Contact_Organization: Alberta Geological Survey

          Contact_Person: AGS Information Manager

        Contact_Position: AGS Information Manager

        Contact_Address:

          Address_Type: mailing and physical

          Address: Alberta Energy Regulator

          Address: 2nd Floor, Twin Atria Building

          Address: 4999-98 Avenue NW

          City: Edmonton

          State_or_Province: Alberta

          Postal_Code: T6B 2X3

          Country: Canada

        Contact_Voice_Telephone: (780) 638-4491

        Contact_Facsimile_Telephone: (780) 422-1459

        Contact_Electronic_Mail_Address: AGS-Info@aer.ca

        Hours_of_Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.

Distribution_Liability: The Alberta Energy Regulator / Alberta Geological Survey (AER/AGS) licenses this information under the Open Government License - Alberta. Any references to proprietary software in our documentation, and/or any use of proprietary data formats in our releases, do not constitute endorsement by the AER/AGS of any manufacturer's product.

  Metadata_Reference_Information:

    Metadata_Date: 20251128

    Metadata_Contact:

      Contact_Information:

        Contact_Organization_Primary:

          Contact_Organization: Alberta Geological Survey

          Contact_Person: AGS Information Manager

        Contact_Position: AGS Information Manager

        Contact_Address:

          Address_Type: mailing and physical

          Address: Alberta Energy Regulator

          Address: 2nd Floor, Twin Atria Building

          Address: 4999-98 Avenue NW

          City: Edmonton

          State_or_Province: Alberta

          Postal_Code: T6B 2X3

          Country: Canada

        Contact_Voice_Telephone: (780) 638-4491

        Contact_Facsimile_Telephone: (780) 422-1459

        Contact_Electronic_Mail_Address: AGS-Info@aer.ca

        Hours_of_Service: 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.

    Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

    Metadata_Standard_Version: FGDC-STD-001-1998

    Metadata_Time_Convention: local time

    Metadata_Access_Constraints: none

    Metadata_Use_Constraints: none