Based on the tectonic characteristics, stratigraphy, physiography, paleogeography and hydrocarbon potential, North-east Java Basin can be divided into 3 (three) tecnophysio-stratigraphic units; the Rembang zone in the north, the Randublatung in the middle and the Kendeng zone in the south.
The Randublatung zone is the most hydrocarbon prospects in the Northeast Java Basin; both reservoir and source rocks have the same high quantity, the quality of cap rock is very large but the organic richness during deposition is very poor, the quality of cap rock is also very poor and the migration is not very sufficient due to the detached structural style. The Kendeng zone, in the other hand, is the worst hydro-carbon prospects; the reservoir rock is very small, although the source rock is very good,the organic richness during deposition is very sufficient clue to the detached structural style. The Rembang zone is in the middle position; the reservoir is large but the source rock is small, the organic richness during deposition is not as rich as in the Randublatung zone, the quality of cap rock is moderate, although the migration is sufficient but the quantity of hydrocarbon is not much. Since all structural traps in the basin have been found, future hidrocarbon exploration must be concentrated on the stratigraphic traps such as; burried topography high , Reef, Facies changes from fine to coarse clastic materials and up dip pinchouts toward the stable Sunda shelf in the north or offshore area.
Author : Sabardi Musliki