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Channel and Levee Deposits, Bloukop Farm, Tanqua Karoo, South Africa

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

Abstract

The Fan 5 outcrops at Bloukop Farm include channel and thin-bed deposits. Initially, this outcrop was interpreted as consisting of middle-fan channel sandstones overlying thin-bedded outer-fan sheet sandstones. Closer examination (and clearing of the outcrop face) revealed that the massive channel sandstones were locally coeval with several of the thin beds (see Figures 4, 5) suggesting channel and levee deposition (Bouma and Wickens, 1994). Kirschner (1999) conducted a detailed study of the area (also reported in Kirschner and Bouma, 2000) that supported this interpretation. Two channels were recognized in the outcrop. channel 1 is the lower channel that shows the connectivity of two of the levee thin beds with the channel sandstones. Most of the other beds are truncated by the channel illustrating variable times of channel cutting and thin-bed deposition. Both of the channels are shallow and wide, and they mostly have erosional contacts with the underlying deposits. And although the channels commonly overflowed (sand-rich sediments form poor and low-relief levees), direct contacts between the channel and thin beds are rare due to deposition, scour, and subsequent fill. The average grain size of the channel deposits is slightly larger than the levee deposits. Paleocurrents of ripples indicate a northerly transport direction within the channel while the layered levee deposits have a divergent 35° offset direction on both sides of the channels. Common sedimentary structures include parallel laminations, current ripple laminations, and climbing ripples; climbing ripples are common at this location (Figure 5).

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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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