Publications

This study was conducted in Kuang area, South Sumatra Basin, where three oil fields: Air Serdang, Mandala, and Kuang are situated. The Kuang area is surrounded by five sub basins (Cintamani, Jantung, Tanjung Miring, Meraksa, and Lematang). Talangakar Formation has been known as a source rock in the area, however the characteristics of the formation is different in each sub basin. It is therefore necessary to find out the most possible sub basin(s) that may be the source of hydrocarbons. Forty two sediment (cuttings) and fifteen crude oil samples have been geochemically analyzed. The basic source rock analysis comprised of screening, kerogen typing, and maturation. Further analysis, such as correlation between source rock and crude oil as well as crude oil to crude oil, has been done by using more sophisticated techniques, i.e. carbon isotope and biomarkers. Based on the geochemistry analysis above, it is indicated that: • Characteristics of the Lemat and Talangakar Formations in Tanjung Miring and Cintamani Subbasins basically show a fluvio-deltaic characters with a slight different: more oxic in Cintamani rather than in Tanjung Miring Subbasin. • Source rocks of Lemat and Talangakar Formations in Lematang Subbasin are interpreted to have shallow marine characters. • Crude oils in Kuang area shows the fluvio-deltaic characteristic. The result of correlation shows that crude oils in Kuang area were most probably derived from source rocks of the Lemat and Talangakar Formations in Tanjung Miring Subbasin. Keywords: Biomarker, Correlation, Fluvio-Deltaic, Shallow Marine.