This grid represents the distribution of total dissolved solids (TDS) in the Keg River / Winnipegosis hydrostratigraphic unit (HSU). It is a result of a geostatistical model which was constructed using publicly available formation water chemistry data from oil and gas well drillstem tests (DST) and production fluids, as well as industry monitoring wells accessed through environmental impact assessment reports.
The TDS surface was mapped at a regional scale using many years of data, thus providing a good indication of regional water chemistry within the unit rather than site-specific values.
The following statistics describe the accuracy of the geostatistical layer used to create the final grid.
Mean error: 11.94 mg/L
Root mean square error: 26 936 mg/L
Average standard error: 26 873 mg/L
Root mean square standardized: 0.99
Step 1 (Modelling the surface): An ordinary kriging algorithm was used in the ArcMap Geostatistical Analyst extension to interpolate the TDS values and create a grid of the TDS distribution in the Keg River / Winnipegosis HSU.
Method Report:
Output surface type: Prediction
Variable: Semivariogram
Type: Spherical
Neighbourhood type: standard
Samples: 562
Cell size: 1000 m
Step 2: The final grid was clipped based on the extent of the Keg River / Winnipegosis HSU, and spatial distribution of data.