Abstract

Hydrogen and oxygen isotope compositions of formation-waters from the Williston Basin are reported from produced waters and drill stem tests for a vertical stratigraphic section near Midale, Saskatchewan. These new data, in conjunction with data from the literature, show that Williston Basin formation-waters vary substantially in isotopic composition between aquifers in the stratigraphic section and within the same aquifer regionally. These large isotopic variations enable the use of H and O isotopes in Williston Basin formation-waters to fingerprint sources of contaminant water encountered during drilling and production of hydrocarbons.

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