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Book Chapter

Seismic Expression of the Boundaries of a Miocene Carbonate Platform, Sarawak, Malaysia

By
Guido L. Bracco Gartner
Guido L. Bracco Gartner
Vrije Universiteit, Amsterdam, The Netherlands
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Wolfgang Schlager
Wolfgang Schlager
Vrije Universiteit, Amsterdam, The Netherlands
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Erwin W. Adams
Erwin W. Adams
Vrije Universiteit, Amsterdam, The Netherlands
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Published:
January 01, 2004

Abstract

The origin of seismic reflections in slope deposits of a Miocene carbonate platform, offshore Sarawak, was studied using cores, well-log data, and two-dimensional seismic. This isolated carbonate platform has slope angles ranging from 2 to 25°. Our interpretation of the seismic data is that the asymmetric and high-rising platform (250–300 m relief) has different stratigraphic character for the southern and northern flanks. The southern slope was characterized by bypass or erosion throughout the aggrading phase of platform development. It was subsequently buried by shale with downbending, onlapping beds that indicate terrigenous sediment transport from the south. An alternative is folding during tectonic deformation. On the northern flank, the shale already started to pile up during platform aggradation. Phases of erosional or bypass conditions were short and alternated with two phases formed when platform debris interfingered with surrounding shale. Shale intercalations can be recognized seismically by negative reflections that quickly lose amplitude away from the platform. Although the overall shape of the platform is probably related to an older structural pattern of the Luconia Province, the asymmetry of the platform architecture and the distribution of sediments are most likely the results of paleowinds.

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Figures & Tables

Contents

AAPG Memoir

Seismic Imaging of Carbonate Reservoirs and Systems

Gregor P. Eberli
Gregor P. Eberli
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Jose Luis Masaferro
Jose Luis Masaferro
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J. F. “Rick” Sarg
J. F. “Rick” Sarg
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American Association of Petroleum Geologists
Volume
81
ISBN electronic:
9781629810058
Publication date:
January 01, 2004

GeoRef

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