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Channels, Levees, and Crevasse Splays at Kleine Riet Fontein Farm, Tanqua Karoo, South Africa

By
Arnold H Bouma
Arnold H Bouma
1
Texas A & M University, College Station, Texas, USA
4
Previously with Louisiana State University, Baton Rouge, Louisiana, USA
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Anne M Delery
Anne M Delery
2
Anteon Corporation, New Orleans, Louisiana, USA
4
Previously with Louisiana State University, Baton Rouge, Louisiana, USA
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Erik D. Scott
Erik D. Scott
3
Shell EP Europe, Aberdeen, United Kingdom
4
Previously with Louisiana State University, Baton Rouge, Louisiana, USA
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Published:
January 01, 2008

Abstract

Fan 3 on Kleine Riet Fontein Farm shows two interesting outcrops separated by shale scree. At the southern outcrop, channel fills can be observed, and in the northern outcrop are levee-overbank deposits with a number of thicker, massive sandstones with net-to-gross (N:G) near 1.0 that can be recognized by their light color. They are interpreted as crevasse splays. The north-south-oriented outcrop probably makes only a small angle with the overall north-south paleotransport direction of Fan 3, making it difficult to obtain a good cross view of the channel margins. Nevertheless, the outcrop shows important parts of channels and levees belonging to a fine-grained turbidite system. The location of both outcrops is shown in chapter 75, this volume. Figures 1A-C reveal three channels separated by thin shales and very thin sandstones. The shaly separations thicken to both sides, indicating that the erosion of the underlying channel was often strongest in the central zone of the channels (see upper channel, Figure 1A). This photograph shows thin-bedded, sand-rich layers separated by silt-rich shales. The picture in Figure 2 does not reveal the thickness of the sand layers. Figure 3B shows four light-colored, massive sandstone layers, which are interpreted as crevasse splays. The massive central part of each channel shows some bedding when observed close-up. Layers are separated by thin shale and/or thin sandstone layers. Both sides of the massive part become thinner layered and thin-bedded. A succession of sandstones and silt-rich shales becomes more distinct toward the ends.

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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