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The AAPG/Datapages Combined Publications Database

Williston Basin Symposium

Abstract

SKGS-AAPG

Eighth International Williston Basin Symposium, October 19, 20, and 21, 1998 (SP13)

Pages 238 - 246

REGIONAL HYDROCHEMISTRY OF CAMBRIAN TO DEVONIAN AQUIFERS IN THE WILLISTON BASIN, CANADA - U.S.A.

ADAM A. BENN, Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan
BEN J. ROSTRON, Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta

ABSTRACT

A basin-wide digital hydrochemistry database has been assembled. Cambrian through Devonian strata were divided into seven aquifers and their geochemical characteristics were analyzed to remove non-representative data.

The mapping of total dissolved solids (TDS), ions and ion ratios has identified three types of formation waters prevalent throughout the geologic section: (1) CaS04 type waters with low TDS (<30,000 mg/1), (2) NaCl type waters with moderately high TDS (100,000 to 200,000 mg/1) and (3) Na-CaCl type waters with high TDS in the deep basin (>300,000 mg/1).

Results show that: (1) differences in water chemistry throughout the basin indicate there are distinct hydraulic flow regimes, (2) variations in water chemistry play a significant role in hydrodynamics and (3) groundwater evolution is controlled by a complicated set of factors.

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