This map depicts the distribution of total dissolved solids (TDS) in groundwater in the Keg River / Winnipegosis hydrostratigraphic unit (HSU). The map 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 distribution of TDS was mapped at a regional scale using many years of data, thus providing a good indication of regional water chemistry within the HSU rather than site specific values. The uncertainty of prediction is depicted on an inset map, which shows the residual values (modelled value minus measured value) plotted at each location to indicate where underprediction or overprediction occurs. Two additional inset maps show the distribution of hydraulic heads and the results of water driving force analysis, respectively. The geometry and variable thickness of the Keg River / Winnipegosis HSU are illustrated on schematic cross-sections.

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Nakevska, N. (2023): Distribution of total dissolved solids in the Keg River / Winnipegosis Hydrostratigraphic unit; Alberta Energy Regulator / Alberta Geological Survey, AER/AGS Map 623.