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Facies Models Revisited: Clastic Shelves

By
John R. Suter
John R. Suter
ConocoPhillips, Sedimentary Systems, Subsurface Technology, P.O. Box 2197, Houston, Texas 77252–2197, U.S.A. e-mail: john.r.suter@conocophillips.com
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Published:
January 01, 2006

Abstract

A consistent, commonly accepted facies model for clastic continental shelf deposits has proven elusive. Sand ridges of various types are ubiquitous on Quaternary shelves, but recognition of ancient examples has been intermittent, as models emerge, evolve, and undergo relative degrees of acceptance and rejection. Continental shelves lie in the zone between highstand and lowstand shorelines, and are greatly affected by sea-level changes. Shelf deposits per se are thus limited to and are most volumetrically significant during periods of high or rising base level, the transgressive and highstand systems tracts. The continental shelf is roughly defined from the base of the shoreface to the shelf margin or upper continental slope. These defining depths, and consequent shelf widths, are highly variable, depending largely on tectonic setting. Primary shelf sediments may be derived from erosional scour of preexisting deposits, biological and/or chemical precipitates, or supplied from adjacent shorelines by direct fluvial, deltaic, or estuarine input, or by tidal flux or storms. Finegrained shelf sediments, constituting potential source and seal facies, are less controversial than the origin and distribution of potential reservoir facies. Coarse-grained shelf deposits are believed to be primarily relict, reworked from shoreline and nearshore deposits laid down during previous regressive episodes, although notable exceptions exist. These deposits can be quite complex, taking on geometries reflecting reshaping by wave, tidal, storm, and oceanic currents, with internal stratigraphics reflecting multi-stage depositional and erosional histories.

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SEPM Special Publication

Facies Models Revisited

Henry W. Posamentier
Henry W. Posamentier
Anadarko Petroleum Corporation, 1201 Lake Robbins Drive, The Woodlands, Texas 77380, U.S.A.
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Roger G. Walker
Roger G. Walker
Roger Walker Consulting Inc., 83 Scimitar View NW, Calgary, Alberta T3L 2B4, Canada
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SEPM Society for Sedimentary Geology
Volume
84
ISBN electronic:
9781565761216
Publication date:
January 01, 2006

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