ABSTRACT: Hydrocarbon habitat application: relation with exploration challenge in the corridor block South Sumatra Basin

Heriana, Nana and Lindy F. Rotinsulu , PERTAMINA EP, Jakarta, Indonesia

Corridor Block is located in the South Sumatra Basin, situated between two main kitchen areas: Limau Graben and Benakat Gulley to the south and the Lows in the Middle Palembang Subbasin to the west, and has no main kitchen within it; however, the size of the local low is enough to generate hydrocarbons. Isopach maps of top the Eocene-Oligocene Formations, the Talang Akar (TAF) and Lahat (LAF) Formations, show 2 paleo lows: Supat Low and Dabug Low.

Based on geochemical data (C4-C7 Gasoline Range, Gas Chromatography, Carbon Isotope and GC-MS), the analysed oils can be divided into three groups. Group I oils were generated from a fluvial-deltaic and coaly shales source, with dominant terrestrial organic matter. For example, the oils in Supat oil which came from Supat Low (TAF). The Group II oils were generated from fluvial-lacustrine source, rich in shales with more algal organic matter as support. For example, the oils in Mangun Jaya oil fields which came from Siarak Low (both TAF and LAF). The Group III oils were generated from deeper water, lacustrine algal rich shales: the oils in Bentayan oil field came from Bentayan Low (TAF and LAF).

Evaluation and reinterpretation in the Corridor Block yields hydrocarbon reserve calculation of 736 MMBO and 1255 BCFG in reserves from the Supat, Siarak, and Babat Lows, although this till needs confirmation. Subtracted by the cummulative oil from existing fields, the reserves is around 350 MMBO and 600 BCFG, respectively, making this block still attractive as an exploration challenge.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia