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CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 14 (1966), No. 2. (June), Pages 322-322

Abstracts of Theses: Relationships Between Texture and Depositional Environment in Mississippian Limestones of the Alida Area, Saskatchewan

B. J. Pfeffer

Depositional fabrics of recent calcareous sediments are mainly controlled by depositional environments. Interpretations made from recent calcareous sediments are thought to provide a reliable indication of the depositional environment of limestones.

Examination of Mississippian limestones of the Alida Beds in southeastern Saskatchewan suggests that they were laid down in an environment similar to that in which a variety of calcareous sediments are being formed at present on the Bahama Banks. Each limestone type in the Alida Beds has a similar counter-part among the Bahaman calcareous sediments.

The distribution of limestone types indicates that most of the Alida area was a broad marginal shoal of the Williston Basin during deposition of the Alida Beds. Development of algal mats apparently caused restricted conditions resulting in deposition of evaporites in longshore lagoons in the eastern part of the area. To the west, open marine shelf conditions prevailed.

Development of effective reservoir porosity is restricted to the limestones that were laid down in the broad marginal shoal environment. Oilfields occur only along the subcrop of the Alida Beds in topographic highs on the post-Mississippian erosion surface, which are associated with limestones of the "shoal" environment.

End_of_Record - Last_Page 322-------

ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES

1963, University of Saskatchewan, M.Sc.

Copyright © 2004 by The Society of Canadian Petroleum Geologists. All Rights Reserved.

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