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MAP 542

Distribution of Total Dissolved Solids in the Wapiti / Belly River Hydrostratigraphic Unit

Abstract: This map depicts the distribution of total dissolved solids (TDS) in groundwater in the Wapiti / Belly River hydrostratigraphic unit (HSU). The map is a result of a simple 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 (predicted value minus measured value) plotted at each location to indicate where underprediction and overprediction occurs compared to the measured TDS values. 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 Wapiti / Belly River HSU are illustrated on schematic cross-sections. Place Keywords 72e 72l 72m 73d 73e 73l 73m 74d 74e 74l 82g 82h 82i 82j 82n 82o 82p 83a 83b 83c 83d 83e 83f 83g 83h 83i 83j 83k 83l 83m 83n 83o 83p 84a 84b 84c 84d 84e 84f 84g 84h 84i 84j 84k 84l alberta canada Theme Keywords belly river group concentration geochemical groundwater chemistry total dissolved solids wapiti

Nakevska, N., Singh, A.  2019-03-19