--> Tectonic and Stratigraphic Evolution of Western Sulawesi (Indonesia) and Associated Development of a Tertiary Petroleum System, by D. Q. Coffield, S. C. Bergman, R. A. Garrard, N. Guritno, N. M. Robinson, and J. Talbot; #90986 (1994).

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Abstract: Tectonic and Stratigraphic Evolution of Western Sulawesi (Indonesia) and Associated Development of a Tertiary Petroleum System

Dana Q. Coffield, S. C. Bergman, R. A. Garrard, N. Guritno, N. M. Robinson, J. Talbot

Recent geological, geophysical and remote sensing studies in the Kalosi PSC, South Sulawesi, have provided new insights into the tectonic and stratigraphic evolution of Sulawesi and describes the petroleum system which sources oil seeps in the area.

Basement in the study area consists of indurated and metamorphosed marine sediments and ophiolitic sequences accreted along the southeast margin of Sundaland through the Cretaceous. Extension and subsidence during the Eocene resulted in fluvial and lacustrine sedimentation which passed conformably upwards through fluvial-deltaic sedimentation into post-extensional Late Eocene to Early Miocene platform carbonate and basinal siliciclastic deposition. A volcano-plutonic belt was established in the Middle to Late Miocene due to the partial subduction of Australian-derived continental microplate(s). Continued convergence through the Pliocene resulted in syn-orogenic sedimentation and the development of the westward-verging orogen present in western Sulawesi today, with a thin-skinned thrus system in its western half expanding into a thick-skinned, basement involved thrust system in its eastern half.

This Neogene orogen provided the final element in creating a working petroleum system. Eocene fluvio-deltaic coals were depressed into the oil window by sedimentary and tectonic loading associated with thickening of the orogenic wedge. Eocene siliciclastic carrier beds provided conduits from sub-thrust kitchen areas to potential Eocene siliciclastic and Mio-Pliocene carbonate reservoirs in compressional ramp anticlines.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994