Print this pageSource Rock Geochemical Study in the Southwestern Java, a Potential Hydrocarbon Basin, in Indonesia
An extensive geochemical study, including pyrolysis, vitrinite reflectance determination, gas chromatography (GC), gas chromatography - mass spectrometry (GC-MS), and carbon isotope of outcrop samples from the southwest Java basins was conducted in order to examine the horizontal and vertical distribution of organic matter and regional maturity levels. This information is used in a subsequent basin modelling exercise to identify the most prospective basin(s) in the Java Island.
Fourteen selected outcrop samples whose location is spreading in the study area have been collected during the first stage of the study in 1997. During the second stage of the study (2007-2008), twenty-three outcrop samples have been collected in-line with measuring section program near Sukabumi City in the southern West Java Province. All of the samples have been analysed geochemically to assess their richness, maturity, source of organic matter and depositional environment.
The best quality source beds analysed are two Miocene outcrops (Cimandiri and Nyalindung Formations), seven Oligocene outcrops (Batuasih Formation), and two Eocene samples (Bayah Formation) contained good (gas and oil prone) TOC’s. The Miocene and Oligocene sediments are immature to just mature and are unlikely to be efficient sources of gas unless buried deeply within the basin. The Eocene Bayah Formation coals are excellent and have significant oil and gas potential and are locally mature. Within the area, no oil has yet been discovered.
AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil