Some new insights to tectonic and stratigraphic evolution of the Tarakan sub-basin, northeast Kalimantan, Indonesia

This paper will discuss the tectonic and stratigraphic evolution of the Tarakan sub-basin, primarily the
fluvio-deltaic deposition during the Neogene time. The Tarakan sub-basin is part of a sub-basin complex which includes the Tidung, Berau, and Muaras subbasins located in Northeast Kalimantan. In this paper, the discussion about the Tarakan sub-basin also includes the Tidung sub-basin. The Tarakan subbasin is located a few kilometers to the north of the famous Mahakam delta. To the north, the Tarakan sub-basin is bounded by the Sampoerna high and to the south it is bounded by the Mangkalihat high. The Neogene fluvio-deltaic sediment in the Tarakan subbasin is thinning to the north to the Sampoerna high and to the south to the Mangkalihat high. The thickest sediment is in Bunyu, Tarakan and in the Ahus structure. The sub-basin is gently deeping to the east started from Kucing high in the west to the open sea of the Celebes sea in the east. The Kucing high is the hinterland and source provenance of the fluvio-deltaic sediment deposited eastwardly in the Tarakan sub-basin since the Early Miocene. To the east of the Tarakan sub-basin is the open sea of the Celebes sea. The Nunukan PSC, operated by Pertamina Hulu Nunukan Company (PHENC), is located in the eastern part of the sub-basin (see Figure 1). The available data in the Nunukan PSC including 2D seismic of 1970 to 1991 vintages and 3D seismic data of 2010 and well location is given in Figure 2.

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Sudarmono, Direza, A., Maulin, H.B., Wicaksono, A., 2017. Some new insights to tectonic and stratigraphic evolution of the Tarakan sub-basin, northeast Kalimantan, Indonesia, in: Proceedings, Indonesian Petroleum Association 41st Annual Convention & Exhibition, May 2017. p. IPA17-722-G.