NEOGENE TECTONIC AND SEDIMENTARY CONTROL TO HYDROCARBON GENERATION IN BANGGAI BASIN, EASTERN SULAWESI

NEOGENE TECTONIC AND SEDIMENTARY CONTROL TO
HYDROCARBON GENERATION IN BANGGAI BASIN, EASTERN
SULAWESI

Bagus Priyanto1, Muh. Rizwan Fitriannur1
1 HMG (Himpunan Mahasiswa Geologi) UNPAD and UNPAD SC of AAPG,
Faculty of Geology, Padjadjaran University
Jl. Raya Bandung-Sumedang km.21, Jatinangor, Sumedang, West Java 45363.
Tel and Fax : (022) 779-6545 Email : priyanto_bagus@yahoo.co.id

ABSTRACT
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.

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