Abstract
Eastern Indonesia Paleozoic basin to recent is still an under-explored basin. The study about this oldest sediment sequence is needed to be done because, in Australia, this sequence is already producing hydrocarbon in several basins, known as the Larapintine petroleum system. This paper is subjected to present Paleozoic sediment occurrence in the south of the Papua area, from outcrop, several wells penetrated this unit and from seismic data. Furthermore, this paper aims to construct a geological schematic diagram in the south of the Papua area. Identified Paleozoic rocks in the southern Papua area are Pre-Permian sequence, consist of Otomona Formation (Late Proterozoic–Cambrian), Tuaba Formation (Ordovician) and Modio Formation (Silurian–Devonian), and Aiduna Formation (Late Carboniferous–Permian) from the Permian–Triassic sequence. Otomona Formation was deposited at the submarine fan environment while the Tuaba Formation was deposited in a shallow marine shelf setting. Modio Formation was deposited at shallow marine to shelf environment, and Aiduna Formation was accumulated at deltaic setting. Paleozoic basin occurred from Arafura sea to onshore of southern Papua with a thickness of up to 5 seconds. This unit’s potential trap is the gentle anticline with geometry up to 8 km long and stratigraphic trap top lap with the unit above it.
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