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Base-of-slope Channel Deposits, Ongeluks River 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 eastern 2 km (1.2 mi) of Fan 3 outcrops represent channel deposition at the base-of-slope (Figures 1, 2). Figure 1 shows details of the contacts between channels while Figure 2 shows approximately 1200 m (3937 ft) of the outcrop with multiple stacked and laterally offsetting channels that are best described as nested channels. The Ongeluks outcrop area is the transition from the feeder canyon to the deep-water basin. As the canyon flares out and the gradient lessens, density currents move from side to side, filling topography and cutting into pre-existing channels. There are 19 partial channels in the outcrops; most are less than 300 m (967 ft) in width (see Figure 2; the summary tables). Many of the sand-filled channels have shales or silty shales lining the channel bases, but in some cases local scour has removed the shale leading to sand-on-sand contacts. The silty shales also occur within the channels and most are laterally discontinuous. The measured sections and paleocurrent directions for this outcrop are from studies by O. van Antwerpen (1992).

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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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