Water--rock interactions in the Pembina Field, Alberta

Chemical analyses of produced water samples from the Pembina Field, Alberta, are used to develop new insights relating to water-rock interactions within the reservoir. Samples from areas of the reservoir subjected to extensive flushing with freshwater show that the dilution of formation water is accompanied by a substantial increase in the concentration of NaHCO/sub 3/. In order to provide an explanation for the NaHCO/sub 3/ build-up, a simple chemical model of the reservoir has been developed.