--> Abstract: The Paleozoic-Mesozoic Sequences in the Eastern Indonesia Basins: The Role to Petroleum Potential, by H. Panggabean and S. Supriatna; #91012 (1992).

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ABSTRACT: The Paleozoic-Mesozoic Sequences in the Eastern Indonesia Basins: The Role to Petroleum Potential

PANGGABEAN, HERMES, and SAM SUPRIATNA, Geological Research and Development Center, Bandung, Indonesia

A study has been made of the distribution and stratigraphic features of the Paleozoic-Mesozoic successions in the eastern Indonesia region, especially Irian Jaya and the islands of Misool, Buru, Ceram, Buton, Banggai-Sula, and Obi-Bacan. Sedimentation in the region commenced in the early Paleozoic.

The tectonic evolution of the basins was related to pre-breakup, breakup, and post-breakup stages of a rift-drift sequence. These stages were associated with ocean formed off northwestern Australia and the proto-Indian and proto-Pacific oceans where some continental blocks might have detached from their margins.

The oldest Paleozoic sedimentary rocks consist predominantly of terrigenous clastic and carbonate rocks, including turbidites. Many of these rocks were regionally metamorphosed, mostly to a low grade, and partly intruded by acid igneous rocks. A shallow marine to paralic environment continued over much of the basins during Late Carboniferous throughout the Late Permian. A phase of terrestrial sedimentation took place in the Triassic until the late Early Jurassic. It was succeeded by a marine condition until Late Cretaceous passing upwards into carbonate platform deposits throughout the Middle Tertiary.

The characteristics of lithologies indicate that hydrocarbon source rocks might have existed and can yield oil and gas. Reservoir rocks are also present in the several horizons. Thus, significant discoveries can be anticipated in the Paleozoic-Mesozoic basins for the future target.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)