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Facies Architecture of a Submarine-slope Channel Complex, Condor West Channel, Cerro Toro Formation, chile

By
Mark D. Barton
Mark D. Barton
Shell Exploration and Technology, Houston, Texas, USA
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Gary S. Steffens
Gary S. Steffens
Shell Exploration and Technology, Houston, Texas, USA
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Ciarán J. O’Byrne
Ciarán J. O’Byrne
Shell Exploration and Technology, Houston, Texas, USA
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Published:
January 01, 2008

Abstract

Deep-water-slope channel complexes of the Cerro Toro Formation are exposed in the Parque Nacional Torres del Paine, southern chile (Figure 1A). A one-kilometer (3300-ft)-wide photomosaic, oriented oblique to paleoflow, provides the basis for a detailed cross-section that documents the facies architecture within a portion of one of these channel complexes. The channel complex, informally referred to as the Condor channel, is exposed along a northeast–southwest-trending ridge located about 4 km (2.5 mi.) to the south of Lago Sarmiento (Figure 1B). The Condor channel is a set of three distinct channel complexes that aggrade and stack to the west (Figure 2A). Each channel complex is 60–80 m (200–260 ft) thick and 1–2 km (3250–6500 ft) wide. A photo panel from the northeast side of channel complex 2 outlines the area of detailed mapping (Figure 2B). The northeast half of the outcrop is nearly perpendicular to the principle flow direction (165°), whereas the southwest half of the exposure (210°) is at a 45-degree angle to the principle paleoflow direction.

Four facies were identified on the basis of grain size and bedding character. They include in order of abundance: amalgamated conglomerate beds (50%), a pebbly-mudstone facies (25%), a facies composed of thinly bedded, interbedded sandstone and mudstone (15%), and amalgamated sandstone beds (10%). The stratal architecture is described in terms of a hierarchy of surface-bounded architectural elements that include channel stories and story sets (Figure 2C). A channel story consists of a relatively conformable

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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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