Oligocene-Early Miocene Paleogeography Model South Balam Trough, Central Sumatra Basin



South Balam trough is one of the most prolific petroleum systems in the Central Sumatra Basin. Current study to construct 3 dimensional paleography model give better understanding geological history of this area. This paper demonstrates effectiveness of paleogeography construction as media to transfer knowledge of interpretation.
This study use seismic and well log to construct chronostratigraphic correlation and structural maps. Cores and sidewall cores are used to interpret depositional environment and relative ages. Integration of these two approaches provides comprehensive understanding of geological history in each chronostratigraphic interval and then visualized as a paleogeographic model.
Two major chronostratigraphic intervals were constructed. During Oligocene, extensional tectonic was dominant resulted in half graben that represents lake formation. This component of paleogeographic setting consists of border fault fan delta, axial stream deposits and deep lacustrine shale. In Early Miocene, this area evolved to a shallow marine setting with fluvial and deltaic deposition.
The construction of paleography model is essential in order to understand petroleum system of an area.


Authors : Agus Susianto, Edi Suwandi Utoro & Satia Graha