DOI: 10.5176/2251-3353_GEOS14.42
Authors: Eddy A. Subroto and Benyamin Sapiie
Abstract: Papua, the most western island in Indonesia has some prolific basins; one of them is the Bintuni Basin. Bintuni Basin is considered as producing basin. It has been believed that source rocks in the basin comprise three clusters: coaly terrestrial shales of Ainim Formation (Late Permian), coaly marine shales of Lower Kembelangan Formation (Jurassic), and calcareous marine claystones of Waripi Formation (Tertiary). During this study, some sediment and crude oil samples have been analysed by using standard geochemistry procedures such as TOC, Rock-Eval pyrolysis, gas chromatography (GC), and gas chromatography-mass spectrometry (GC-MS) techniques. Some biomarkers have been used to correlate oil to oil and oil to source rock. It is concluded that the promising source rock found based on the occurrence and the absence of oleananes biomarker, is Pre-Tertiary sediments belonging to Sequences 1 and 2. Tertiary sediments seem to be excluded as source rock based on this study. Basically, almost all sediments studied are rich in organic matter. The constraint factor is maturity. Maturity appears to start from Sequence 4 sediments based on both assessments: laboratory and modelling.
Keywords: Bintuni Basin; Pre-Tertiary source rocks; oleananes
Updating...