--> Abstract: Evolution of Carbonate Reservoir in South Makassar Basin, Indonesia, and Hydrocarbon Prospectivity Assessment within the Area, by Dardji Noeradi, Eddy A. Subroto, Awali Priyono, Handoyo E. Wahono, and Eddy Hermanto; #90072 (2007)

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Evolution of Carbonate Reservoir in South Makassar Basin, Indonesia, and Hydrocarbon Prospectivity Assessment within the Area

Dardji Noeradi1, Eddy A. Subroto1, Awali Priyono2, Handoyo E. Wahono3, and Eddy Hermanto3
1Institute of Technology, Bandung (ITB), Bandung, Indonesia
2Bandung Institute of Technology, Bandung, Indonesia
3Executive Agency for Upstream Oil and Gas Business Activities (BPMIGAS), Indonesia, Jakarta, Indonesia

The South Makassar Basin development commenced in the Middle Eocene time by formation of a rift basin controlled by three pre-existing fault trends namely Meratus trend (NE-SW), Adang trend (NW-SE), and Doang trend (N-S). During Eo-Oligocene time, a transitional sag phase took place characterized by regional subsidence controlled by NW-SE extensional tectonic regime. During this period, most faults ceased their activity and only certain NE-SW normal faults continued actively to control the basin until Late Oligocene.
Carbonate platform and built up were deposited in the shelfal setting while deep marine turbiditic carbonates intercalated with shales were deposited in the deeper part of the basin. During Early to Middle Miocene, a true sag phase occurred. During this period, the basin resembled the steering horn geometry, and practically no fault was active. In the eastern side, volcanoclastic sediments were deposited while in the western and southern sides the sediments are characterized by clastic turbiditic carbonates.
Geochemical analyses indicate that the Eocene, Oligocene and Miocene shales may become source rocks of the area. They contain Types III (mainly) and II (some) kerogens. Geochemical modeling results show that the deeper basin has already been in the gas window, whereas the shelfal areas are still within the oil window. The proven reservoir interval is within Oligocene carbonate and also the Eocene clastics. A reefal built up trap is proven in the western shelfal part of the basin while some closure related to flower structure and thrust system are present in the eastern part of the basin that related to Late Miocene to present day deformation.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece