  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
