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ABSTRACT: Geology and Petroleum Potential of the Indonesian Fore-Arc Basins

John A. Katili, Hadi Prasetyo, Djoko Indriastomo, Luki Samuel, Indra Kusuma

Fore-arc basins, which constitute an important element of a convergent plate margin, are situated between the volcano/plutonic arc and the adjacent accretionary wedge. Based on their tectonic setting, the Indonesian fore-arc basins are classified into four groups comprising (1) fore-arc basins associated with oblique subduction of an oceanic plate beneath an island arc (West Aceh basin, West Sumatra basin, West Bengkulu basin, and South Sunda Strait basin), (2) fore-arc basins generated from normal c.q. perpendicular subduction of an oceanic plate under an island arc (South Java basin and Lombok basin), (3) fore-arc basins developed in an early stage of arc continental collision (Sawu basin and Weber basin), and (4) fore-arc basins formed in a mature stage of continent-ar collision (Gorontalo basin and the Bone basin).

The first two groups occur in western Indonesia, which has been only slightly affected by the collision of India and Eurasia. The latter two groups of basins occur in eastern Indonesia where the regular development of a double island arc system was severely interrupted by the collision of the northward advancing Australia-New Guinea plate and the Eurasian plate.

We will discuss the age, structural lineament, and surface irregularity of the subducting plate, which balances between sediment input and rate of subsidence of the different basins and migration of depocenters. An overview of the petroleum potential of the fore-arc basins will also be presented with special emphasis on the basins which have been sporadically explored for their hydrocarbon occurrence.

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990