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The AAPG/Datapages Combined Publications Database

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Abstract

G. P. Eberli, J. L. Masaferro, and J. F. ldquoRickrdquo Sarg, 2004, Seismic imaging of carbonate reservoirs and systems: AAPG Memoir 81, p. 351-365.

Copyright copy2004. The American Association of Petroleum Geologists. All rights reserved.

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

Guido L. Bracco Gartner,1 Wolfgang Schlager,2 Erwin W. Adams3

1Vrije Universiteit, Amsterdam, The Netherlands; Present address: Shell International E amp P, Rijswijk, The Netherlands.
2Vrije Universiteit, Amsterdam, The Netherlands
3Vrije Universiteit, Amsterdam, The Netherlands; Present address: Massachusetts Institute of Technology, Cambridge, Massachusetts, U.S.A

ACKNOWLEDGMENTS

We thank Petronas Nasional Berhad, especially Mr. Chua Beng Yap and Mr. Muhammad Adib, for the release of the data and the permission to publish this study. Mr. Tan E. Kim and his crew from the core shed are also gratefully acknowledged. Arnout-Jan Everts, Volker Vahrenkamp, and Guy Mueller (Sarawak Shell Berhad) gave important advice on studying both the cores and the seismics. Reviewers Xavier Janson and Chris Kendall are thanked for helpful comments. This manuscript also benefited from earlier reviews by Steve Bachtel, Moyra Wilson, Art Saller, Rick Sarg, and David Budd.

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 25deg. Our interpretation of the seismic data is that the asymmetric and high-rising platform (250ndash300 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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