Skip to Main Content
Book Chapter

Toe-of-slope Channel Complexes at Buena Vista, Upper Brushy Canyon Formation, Texas, USA

By
C Rossen
C Rossen
1
ExxonMobil Development Company, Houston, Texas, USA
Search for other works by this author on:
R. T Beaubouef
R. T Beaubouef
2
ExxonMobil Exploration Company, Houston, Texas, USA
Search for other works by this author on:
Published:
January 01, 2008

Abstract

Upper Brushy Canyon strata at the Buena Vista locality are interpreted as channel complexes deposited in a toe-of-slope environment along a major sediment-transport fairway into the basin (Figure 1) (Zelt and Rossen, 1995; Beaubouef et al., 1999). Architectural styles are calibrated by excellent outcrop exposures, and by cores and well logs from two research boreholes. At Buena Vista (Figure 2A, B), the upper Brushy Canyon sandstones are 80 m (262 ft) thick and exposed along a northwest-trending ridge that is 1000 m (3280 ft) long. The outcrop is oriented oblique to paleoflow, which is variable but generally directed eastward. Units of laminated siltstones are relatively thin compared to Guadalupe Canyon, and the upper Brushy Canyon sandstones are broadly tabular in external geometry, although they are highly channelized internally. A sequence boundary is interpreted at the sharp, subplanar contact between upper Brushy Canyon sandstones and the underlying, laterally extensive, laminated siltstone unit (“40 Ft Siltstone,” Zelt and Rossen, 1995). The upper Brushy Canyon is composed of at least two sandstone-prone channel complexes, which are separated by a thin, laterally extensive, organic-rich siltstone (“Marker Bed,” Zelt and Rossen, 1995) that is interpreted as an abandonment interval. Axial areas of the channel complexes are characterized by high net-to-gross, amalgamated, thick-bedded sandstones. The axial areas contain numerous, inter-cutting, sandstone-filled channels (up to 15 m [50 ft] deep) that stack in a laterally offset, or compensational, pattern. Towards the off-axis and margin areas of the channel complexes, the sandstones become less amalgamated and transition into tabular sandstone ledges separated by recessive siltstones.

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

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

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal