The Makassar Strait located between Kalimantan and Sulawesi Islands in Central Indonesia is a north-south orientated seaway, around 700 km long, 125-400 km wide with maximum water depths almost 2500 m. Bathymetrically, the Makassar Strait is divided into the northern and southern depressions and are hence sometimes referred to as the North and South Makassar Basins.
While the Paleogene history for the opening of the Makassar Straits is commonly agreed by many authors, the mechanism of the opening of the Straits and nature of the basement underlying the straits have been the subjects of considerable scientific debates. The debates in history are mainly because of lack of data representing direct data on the geology of the Makassar Straits. Most debates were based on modeling of subsidence history, gravity, magnetic and plate tectonics.
Satyana (2015) presents new data of the North Makassar Strait basement penetrated by two exploration wells: Rangkong-1 and Kaluku-1. The basement analyses include: Petrography, XRD, biostratigraphy, petrochemistry,
magnetic susceptibility, multi-isotope geochronology, and organic geochemistry. Oils discovered by Kaluku-1 well in Eocene section provides further information based on analyses of bulk properties, carbon isotope, and various