Crustal Structures of the Eastern Sundaland’s Rifts, Central Indonesia: Geophysical Constraints and Petroleum Implications

Proceedings of Bali 2010 International Geosciences Conference and Exposition, Bali, Indonesia, 19-22 July 2010

Crustal Structures of the Eastern Sundaland’s Rifts, Central Indonesia: Geophysical Constraints and Petroleum Implications

Awang Harun Satyana1

1 BPMIGAS (Executive Agency for Upstream Oil and Gas Business Activities, Republic of Indonesia)

 

ABSTRACT

Being positioned on the active margin of southeastern Eurasian plate, Eastern Sundaland had recorded the history of subduction, accretion, and collision from oceanic plates of the Tethys Seas and Gondwanan microcontinents during the Mesozoic. The processes had grown the area of Eastern Sundaland by terrane amalgamation. Started in the middle Eocene, Eastern Sundaland dispersed through rifting due to a number of mechanisms. South and Makassar Straits, East Java Sea, Gorontalo and Bone Bays rifted forming sedimentary basins. Sediments capable to become petroleum sources, reservoirs and seals were deposited into the basin and a number of traps were formed. North and South Makassar Basins and East Java Sea Basin are the proven petroleum basins, whereas Gorontalo and Bone basins are potential basins for the occurrences of petroleum accumulation. Seismic, gravity, and magnetic data are employed to understand the origin and nature of crustal structures of Eastern Sundaland. These provide tectonic interpretation of the areas discussed and the implications for petroleum accumulation.

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