A New View on The Petroleum Geology of The Buru Island, Eastern Indonesia



As exploration in the western part of Indonesia has reached its mature stage by now, attention will be focused to eastern Indonesia with its many unexplored areas. The Buru island is located between the Banda Sea and Seram Sea. The Banda Arc region repre-sents an area where three major plates interact : the Eurasian Plate, the Indian-Australian Plate and the Pacific Plate. The area is furthermore known for its geological complexity. During the previous years, people had assumed that the sedimentary basin surrounding Buru island was located in the southern part. Gravity interpretation by PERTAMINA-LIPI revealed that the western part and the northern part also comprise sediment sparsely enough and have the possibility to be potential for hydrocarbon exploration. Thirty-nine outcrop samples from Triassic to Neogene sediments had been submitted by PERTAMINA-LIPI for source rock analysis in the Buru area. Only the Ghegan Formation of Cretaceous age shows fair to good source rock potential. This formation consisted of carbonaceous clastic sediments interspersed with the carbonate, with the TOC values that might range between 4.26 – 1.06 %. The sandstones and the conglomeratic parts of the Neogene Hotong Formation frequently show fair to good porosity and generally represent fair to good reservoir potential. Oil on the Scram island mainly found in both the shallow Pleistocene carbonate and clastic reservoir. Geochemical studies suggest that the oil were generated from the Manusela Formation. Based on the geological similarity and condition between Buru and Scram, we still have chances to find hydrocarbon in the Buru area.


Authors : Suryadi Oemar & Cholidy H Reminton