Neogene Tectonic and Sedimentary Control to Hydrocarbon Generation in Banggai Basin, Eastern Sulawesi



The Banggai Basin is located eastern Sulawesi, south of Molucca Sea. This region is one of the most complicated active margin in term of geology. This basin as a part of the Banggai-Sula microcontinent.
Regional tectonics of Banggai Basin is the collision complex/ foreland thrust belt which interpreted to have formed as a result of the collision, during the Miocene, of the Banggai-Sula Continental Microplate and Asiatic Plate. The Collision resulted in considerable folding, faulting, and imbrication of the sedimentary section, and also in the obduction of one of the largest masses of ophiolite in the world, which known as the East Sulawesi Ophiolite Belt. Those tectonic activities have affected the stratigraphy across The Banggai Basin. It’s stratigraphy is related to two distinct time periods, the first representing a continental margin rift to collision, and the second representing a foreland basin molasses sequence. Both of the periods have contribution to
hydrocarbon generation in Banggai Basin. The increasing of geothermal gradient cause the collision probably also has contribution in this area for hydrocarbon generation. The presence of numerous oil and gas seepages in north-west Taliabu, active wet gas seepages near Falabisahaya in Mangole, oil and gas from the Dongkala-1 well, gas from Minahaki-1 and Matindok-1 well, prove that hydrocarbons have been generated in the area from thermally mature source rocks and have migrated into suitable traps. Source rock, reservoir rock, and sealing rock are all present within the Miocene sequence. Suitable traps are present both structural and stratigraphic traps. By reviewing publications about the Banggai Basin, this paper aims to stimulate the idea that hydrocarbon exploration in the Banggai Basin still have big chance to find more hydrocarbon. Eventhough the sequence rocks of this basin probably started in late Paleozoic until Cenozoic, but our focus is Neogene ago.


Author : Bagus Priyanto, Muh. Rizwan Fitriannur