[Prosiding IAGI 2007] - 2007-JCB-199

PETROLEUM SYSTEM AND SUB BASIN DISTRIBUTION IN TANJUNG BLOCK, BARITO BASIN, SOUTH KALIMANTAN

Gonata Pranajaya*, Raden Idris*, Maikel Arifin*, Moh Imron*
* PT. Pertamina EP

Barito Basin is a potential hydrocarbon basin in Indonesia. Petroleum system which has developed within the basin is still one interesting case for the people who work in the oil industry regarding to the fact that Barito Basin has a large dimension, but it is not suitable with the fields being discovered successfully. Recently, there are only three fields being produced, they are Tanjung, Warukin, and Tapian Timur. Only Tanjung Field produced significantly the oil about 5000 BOPD. Whether the other Fields produced oil for about 600 BOPD. The exploration drilling in the outside of those fields has been done almost in all area of the basin, but none of the result gave the satisfied conclusion, none to be a hydrocarbon discovery well. Therefore there is an assumption that the hydrocarbon in Barito Basin only accumulated in Tanjung Field.

The Barito Basin lays along the southern eastward of Sundaland and separated from Asem-asem Basin and Pasir Basin by Meratus Mountain in northwest side. To the north, the Barito Basin is delimited by Paternoster Fault System or the Bario-Kutei cross high. The structural development was began in the Early Tertiary (Paleogene) with the faulting and followed by compression tectonic in the Late Tertiary (Neogene). Rifting phase produced fault system trending SE – NW formed grabens and horsts. Meanwhile the compression regime produced the uplift of Meratus Mountain, Kasale-Sihung High, and Tanjung High. The uplift mechanism also gave effect to the reverse faults trending NNE – SSW and also the wrench faults.


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