General Information
File Identifier: DIG_2012_0017.xml
Metadata Language: eng; CAN
Metadata Date Stamp: 2016-03-29
Organization: Alberta Geological Survey
Organization Role: pointOfContact
Identification Information
Title: Modelled Sandiness of the Paskapoo Formation, Alberta (Tabular data, tab-delimited format)
Dataset Publication Date: 2012-09-12
Dataset Language: eng; CAN
Abstract: This digital dataset represents the modelled outputs of the three-dimensional distribution of sandiness in the Paskapoo Formation, Alberta, Canada. Sand-abundance values were determined from log analysis of water-well lithologs and petroleum exploration downhole-geophysical logs, specifically gamma-ray logs. We derived the sandiness values by calculating the average sandiness in 25 m thick slices above the base of the Paskapoo Formation in a borehole and by assigning the average value (P50) to the midpoint of each slice interval. Alberta Geological Survey Bulletin 66 provides detailed descriptions of the methodology. We tested the borehole sand-abundance values in a 3-D variogram prior to kriging in a regular block model consisting of cells with dimensions of 1000 m on the x and y planes and 25 m in the z (elevation) direction. Values of modelled sandiness range from 0 (absence of sand) to 1 (100% sand) and are assigned elevations based on two datums: 1) a stratigraphic level corresponding to the height of the midpoint of each respective 25 m thick slice interval above the base of Paskapoo Formation, and 2) the elevation of the midpoint of the slice above sea level. Importing the modelled results of sandiness into model viewing software, such as Voxler™, permits the user to generate three-dimensional isovalue plots illustrating the differences in distribution and geometry of aquifers as different cutoff or threshold criteria are applied. The dataset also enables one to delineate the regional lithostratigraphic units nested within stratigraphically complex rock formations.
Hierarchy Level: Dataset
Data Type: Vector
Access Constraints otherRestrictions
Use Constraints otherRestrictions
Other Constraints 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. 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.
Data Theme
Theme Topics: geoscientificInformation
Reference System Information
Reference System URN: EPSG:3400
Reference System Organization ID:
Spatial Domain
West Bounding Longitude: -120
South Bounding Latitude: 50
East Bounding Longitude: -112
North Bounding Latitude: 55
Zoom to the resource envelope
Data Quality Information
Scope (quality information applies to): Dataset
Data History: We significantly culled and screened the source data prior to calculating sand abundance in respective 25 m thick slices. Alberta Geological Survey Bulletin 66 documents this process. To facilitate ease of computation, Log ASCII Standard (LAS) gamma-ray log data were converted into binary format using ViewLog® software. To ensure consistency and quality of the gamma-ray log data, only those logs recorded from 1986 and later were selected, this being about the time in which the well-logging industry standardized tool calibration. If more than one gamma-ray log was run for an interval of interest, the log that terminated nearest to the ground surface and with the most data was selected. Log data were tested for completeness of records. We excluded null, incomplete, and unsuitable data (e.g., data recorded in the cased part of the hole) from analysis.
Contact Information
Organization: Alberta Geological Survey
Contact Position: AGS Information Manager
Address: Alberta Energy Regulator
City: Edmonton
State: Alberta
Postal Code: T6B 2X3
Country: Canada
Telephone: (780) 638-4491
Fax: (780) 422-1918
Distribution Information
Distribution Link:
Metadata Reference Information