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The AAPG/Datapages Combined Publications Database

Williston Basin Symposium

Abstract

NDGS-AAPG

Fifth International Williston Basin Symposium, Core Workshop, June 14, 1987 (SP9A)

Pages 33 - 58

THE LOWER RATCLIFFE INTERVAL (MISSISSIPPIAN) IN WILLIAMS AND MCKENZIE COUNTIES, NORTH DAKOTA

Michael L. Hendricks, Hendricks and Associates, Inc.

ABSTRACT

The lower Ratcliffe interval in Willians and McKenzie Counties. North Dakota is a carbonate to evaporite regressive sequence. The lower Ratcliffe has been informally divided into Midale, Berentson, Alexander, and Flat Lake subintervals based on lithologies and wireline log responses. The Alexander and Flat Lake beds are locally productive along southeast plunging anticlines in the central Williston Basin. The Alexander subinterval consists principally of shallowing upward, shallow shelf, and restricted subtidal depositional facies. Production is associated with partially dolomitized mudstones and wackestones of the restricted subtidal facies. The Flat Lake subinterval is a complex assemblage of restricted subtidal. intertidal. and supratidal-sabkha depositional facies. Production is from intergranular and pinpoint vuggy pores associated with shoaling sequences.

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