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Slope-Channel Complexes at Guadalupe Canyon, Upper Brushy Canyon Formation, Texas, USA

By
C Rossen
C Rossen
1
ExxonMobil Development Company, Houston, Texas, USA
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R. T Beaubouef
R. T Beaubouef
2
ExxonMobil Exploration Company, Houston, Texas, USA
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Published:
January 01, 2008

Abstract

Upper Brushy Canyon outcrops at Guadalupe Canyon (north outcrop belt) provide a spectacular, strike view of vertically stacked, large, erosional channels that are incised into thick successions of laminated siltstones and thin-bedded sandstones (Zelt and Rossen, 1995; Beaubouef et al., 1999). The channel-bounding master erosion surfaces are low-aspect-ratio (<20:1) features, 15–30 m (50–100 ft) deep and up to 400 m (1300 ft) wide. The channels trend southeast–east, indicating flow toward the basin at a high angle to the basin-margin trend. channel fills are variable and include: 1) thick packages of thin-bedded siltstones and sandy turbidites that drape channel margins, 2) tabular, nonamalgamated, thick-bedded, massive, fine-grained sandstones that change facies into thin-bedded turbidites at channel margins (dominant type), and 3) erosionally based, amalgamated, thick-bedded, fusulinid-rich sandstones. channel margins are geometrically complex and characterized by: 1) stacked erosion surfaces, 2) inclined packages of thin-bedded, sandy turbidites and siltstones that drape channel margins, and 3) remnant (or truncated) channelform sandstones. At the base of the section, a siltstone-draped truncation surface with irregular geometry is a possible slump scar that appears to have influenced the location of younger channels.

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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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