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Geology; July 2000; v. 28; no. 7; p. 635-638; DOI: 10.1130/0091-7613(2000)28<635:ROTRFS>2.0.CO;2
© 2000 Geological Society of America
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Reversal of the regional-scale flow system of the Williston basin in response to Pleistocene glaciation

Stephen Grasby*,1, Kirk Osadetz*,1, Robert Betcher*,2 and Frank Render*,2

1 Geological Survey of Canada, 3303 33rd Street N.W., Calgary, Alberta T2L 2A7, Canada
2 Water Resources Branch, Manitoba Natural Resources, Box 18, 200 Saulteaux Crescent, Winnipeg, Manitoba R3J 3W3, Canada

Low {delta}18O values of formation waters, collapse structures related to salt dissolution, hydrodynamic blowout structures, and biodegradation of oils all suggest a significant influx of fresh water into the Williston basin along the outcrop belt in southern and central Manitoba during Pleistocene glaciation. The thickness of the continental ice sheet over Manitoba would have provided sufficient potentiometric drive to reverse the regional-scale flow system of the Williston basin. The dynamic nature of the flow system suggests that modern-day pressure distributions may not be good proxies for ancient petroleum migration pathways as is commonly assumed.

Key Words: Williston basin • Pleistocene glaciation • hydrogeology




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