Distribution of Total Dissolved Solids in the Peace River / Viking / Bow Island Hydrostratigraphic Unit

This map depicts the distribution of total dissolved solids (TDS) in groundwater in the Peace River / Viking / Bow Island hydrostratigraphic unit  (PVB HSU). The map is a result of an ordinary kriging technique using publicly available water chemistry data from Alberta Environment and Parks' (AEP) Alberta Water Well Information Database (AWWID) and formation water chemistry data from oil and gas well drillstem tests and production fluids.

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 uncertainty of prediction is depicted on an inset map, which shows the residual values (modelled TDS value minus measured TDS value) plotted at each location to indicate where underprediction and 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 PVB HSU are illustrated on schematic cross-sections. A regional lithostratigraphic and hydrostratigraphic table shows the relationship between the PVB HSU and overlying and underlying units.