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Portrait of a Basin-Floor Fan for Sandy Deepwater Systems, Permian Lower Brushy Canyon Formation, West Texas

By
Mary Carr
Mary Carr
Department of Geology and Geological Engineering, Colorado School of Mines, Golden, Colorado, U.S.A.
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Michael H. Gardner
Michael H. Gardner
Department of Geology and Geological Engineering, Colorado School of Mines, Golden, Colorado, U.S.A.
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Published:
January 01, 2000

Abstract

The architecture of basin-floor deposits from unconfined flows, showing bed compensation and nonunique bed patterns, is stratigraphic in origin. Stratigraphic forcing is demonstrated in an upward coarsening succession of layered sheet sandstones that encase isolated distributary channel complexes deposited 30 km from a physiographic margin. This 70-m-thick basin-floor succession contains three fourth-order cycles that show organized changes in sediment body type, bed thickness, facies proportion, and percentage of sand. Siltstone-dominated Fan 1 (8% sandstone) drapes but incompletely fills underlying paleotopography. Layered sandstone sheets (~75%, 0.59-m-thick bed sets) dominate Fan 2 (93% sandstone) and encase the only channel-flanking wedge (~7.4%) and channelform (~7.35%) elements. Amalgamated sandstone sheets (~99%, 0.80-m-thick sandstone bed sets) dominate Fan 3 (87% sandstone) with minor channelform elements (0.3%).

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Contents

AAPG Memoir

Fine-Grained Turbidite Systems

Arnold H. Bouma
Arnold H. Bouma
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Charles G. Stone
Charles G. Stone
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American Association of Petroleum Geologists
Volume
72
ISBN electronic:
9781629812625
Publication date:
January 01, 2000

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