GEOKIMIA ORGANIK DAN PEMODELAN TIGA DIMENSI CEKUNGAN SUNDA DAN ASRI, INDONESIA
The Sunda and Asri Basins are back-arc basins and are located at SE of Sundaland, Indonesia. These basins contain Cenozoic sediments by the Paleogene half-graben system and sagging in Neogene with boundary in eastern by major faults system relatively north-south trend. The exploration has been activ...
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| Format: | Dissertations |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/86652 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Sunda and Asri Basins are back-arc basins and are located at SE of Sundaland, Indonesia. These basins contain Cenozoic sediments by the Paleogene half-graben system and sagging in Neogene with boundary in eastern by major faults system relatively north-south trend. The exploration has been actively conducted with several discoveries and fields have been found and mainly contain oil and relatively minor gas. Organic geochemistry and basin modeling have not been thoroughly investigated in the Sunda and Asri basins. The Talangakar Formation is composed of a mixture of type II and type III. The Banuwati Formation is composed predominantly of type I algal organic material and indicates the organofacies of lacustrine environment. Biomarkers from the Sunda and Asri Basin crude oils indicate that it originates from the lacustrine organofacies source rock and correlatable to the lacustrine shale of the Banuwati Formation. The novel interpretation based on biomarkers in this study proved that the Banuwati Formation containing lacustrine shale which was deposited in a suboxic-oxic environment, different from the previous interpretation which was deposited in an anoxic environment. Basin modeling results show that the generation of hydrocarbons from the Banuwati Formation source rock began in the Oligocene. The lacustrine organofacies character from the Banuwati Formation source rock dominantly influences the generation type of oil in the research area. Potential in-place Yet To Find (YTF) volumes total around 245 MMBOE in the Sunda Basin and 2185 MMBOE in the Asri Basin, resulting from this research. There is a significant difference in potential volume between the Sunda and Asri Basins which will provide benefits in selecting exploration strategies for the two basins in the future.
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