Abstract
We analyzed the tectonics and stratigraphy of the Southern Great Tarakan Basin to determine its tectonic evolution during the Mesozoic-Cenozoic Eras, the evolution of basin geometry, and the potential of hydrocarbon using integrated surface and subsurface data. Southern Great Tarakan Basin can be divided into three sub-basins, Berau, Muara, and South Tarakan. They comprise deposits of Jurassic to Quaternary age, which can be assigned five mega sequences based on their lithological characteristics and tectonic development. We divide the tectonic events into four main phases; (1) contractional Jurassic-Cretaceous, (2) extensional Paleogene, (3) subsidence Early Neogene, and (4) contractional Late Neogene. The development of the strike-slip activity influenced the geometric evolution of the two sub-basins. NW-SE transpressional structures formed during the contraction phase caused most of the existing structure in Paleogene reactivated and inverted, followed by basement uplift and erosion. Consequently, the evolution of the transpressional system caused The Great Tarakan Basin to be divided into five sub-basins during the Late Miocene-Pliocene. Moreover, five horizons with hydrocarbon potential exist in the southern part of The Greater Tarakan Basin; three plays in the Berau Sub-basin, and two main plays in the Muara Sub-basin. The Late Neogene structures in the Berau Sub-basin control the accumulation, migration, and trapping mechanism, whereas these structures do not exist in Muara; hence, this sub-basin is dominated by stratigraphic traps.
Highlights
The Greater Tarakan Basin is one of the basins situated along the eastern Kalimantan passive margin (Wight et al, 1993; Doust and Noble, 2008; Wijayanti et al, 2014; Koesoemadinata, 2020)
We used surface and subsurface data in analysis and interpretation to answer the following research questions: (1) What is the nature of the tectonic evolution of the Southern Great Tarakan Basin? (2) How have tectonics influenced basin geometry and stratigraphy in the two sub-basins? (3) What are the consequences of tectonic development for the presence of hydrocarbons in the two sub-basins? We propose an updated crosssectional model of tectonic evolution as well as a tectonostratigraphic model in the two southern sub-basins
The Southern Great Tarakan Basin is a part of the southeast Sundaland, which is bounded by the Celebes Sea, the subduction zone of the north Sulawesi and the Palu Koro Fault Zone (PKFZ) in the northeast-eastern area, the Mangkalihat High and Samporna High in the south and north, and Central Borneo Range/Kuching High in the west
Summary
The Greater Tarakan Basin is one of the basins situated along the eastern Kalimantan passive margin (see Figure 1) (Wight et al, 1993; Doust and Noble, 2008; Wijayanti et al, 2014; Koesoemadinata, 2020). The Tarakan, Malinau, and Tidung sub-basins are located in the north, while the Berau and Muara sub-basins are situated in the southern area (see Figure 1) (Maulin et al, 2019). Krisnabudhi, A.; Sapiie, B.; Riyanto, A.M.; Gunawan, A.; Rizky, F.F. The appearance of metamorphic rock units in the northwest Berau Sub-basin area demonstrates the complexity of the lithological units in the southern part (Situmorang and Burhan, 1995; Supriatna and Abidin, 1995). The appearance of metamorphic rock units in the northwest Berau Sub-basin area demonstrates the complexity of the lithological units in the southern part (Situmorang and Burhan, 1995; Supriatna and Abidin, 1995) The existence of these metamorphic rock units is a point of contention when reconstructing tectonic developments in the Southern Great Tarakan Basin. The entire model will describe the implications of tectonic and stratigraphic development to the presence of hydrocarbon potential of the two sub-basins
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