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Book Chapter

Deep Water Depositional Systems—Ultra-Deep Makassar Strait, Indonesia

By
Henry W. Posamentier
Henry W. Posamentier
Veritas Exploration Services 715 Fifth Avenue SW Calgary, Alberta T2P 5A2
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Meizarwin
Meizarwin
ARCO Indonesia Perkantoran Hijau Arkadia Jl. Let. Jenderal TB. Simatupang, Kav. 88 Jakarta 12520 Indonesia
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Putri Sari Wisman
Putri Sari Wisman
Schlumberger-GeoQuest P.O. Box 4598/JKT Jakarta 10045 Indonesia
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Tom Plawman
Tom Plawman
Schlumberger H-RT 5599 San Felipe, Suite 1700 Houston, Texas 77056
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Published:
December 01, 2000

Abstract

The ultra deep environment in the Makassar Strait, offshore eastern Kalimantan, Indonesia is characterized by abundant turbidite, debrite, and sediment wave deposits. Key depositional elements imaged by 3-D seismic data include leveed channels, distributary channels/frontal splays, overbank wedges (levees), overbank splays/sediment waves, bottom-current sediment waves, debris flow sheets and debris flow lobes. These elements are systematically deposited within the context of a deep-water depositional sequence in the following order: 1) debris flow sheets/lobes at the base, 2) distributary channels or frontal splays, 3) single, prominent leveed channels, capped by 4) less widespread debris flow sheets or lobes.

Leveed channels of inferred Miocene to Pleistocene age are common in the stratigraphic record of the ultradeep (i.e., greater than 2000 m water depth) Makassar Strait. These channels are characterized by moderate to high sinuosity and range in width from less than 250 m up to one km, and are associated with overbank wedges approximately one order of magnitude wider. Overbank wedges are characterized by abundant sediment waves. These sediment waves commonly are best developed on outer bends of channel meanders. Sea-floor irregularities have a marked impact on channel pattern as well as stratigraphic architecture. One prominent channel is characterized by a dramatic increase in sinuosity and decrease in channel width just down-system from a toe-thrust ridge across which it flows.

Leveed channels commonly feed as well as overlie distributary channel complexes. Distributary channel complexes can attain widths of greater than 10 km and thicknesses exceeding 80 m. Frontal splays appear to be channelized throughout, nearly to their distal extremities.

Debris flow deposits, in the form of sheets, lobes, and channel fill, are common in the study area. Amalgamated debris flow sheets reach thicknesses up to 150 m and widths greater than 20 km. The base of debris flow sheets are characterized by scour and exhibit deep (up to 30 m) and long (greater than 20 km) parallel grooves that diverge basinward.

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Contents

GCSSEPM

Deep-Water Reservoirs of the World

Paul Weimer
Paul Weimer
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
20
ISBN electronic:
978-0-9836097-0-4
Publication date:
December 01, 2000

GeoRef

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