Publications

The South Sumatra Basin is one of Indonesia’s most prolific basins with a large number of oil and gas discoveries. However, oil and gas field patterns are not well understood. Hydrocarbon types encountered in this area, in term of gas-oil-non hydrocarbon types, are not in a specific pattern. This condition leads to increasing uncertainty about the prospect or leads to uncertainty regarding the economic calculations. Migration is one of the petroleum system processes that determine oil and gas distribution along reservoirs. Therefore, further study in understanding the migration patterns from source rock into a trap is needed. The study has used source rock data from 23 wells, hydrocarbon analysis data, log and rock type from the wells that contain source rock and geochemical data and six geological sections. This data was used to construct and perform both 1D and 2D basin modelling. Three 1D models, six 2D models, a hydrocarbon migration map and one hydrocarbon trapping schematic block diagram have been generated in this study. Based on the petroleum system modelling result, source rock in the Benakat Sub-basin was already mature since 15,5 Ma, Pigi Sub-basin since 14 Ma and Saung Naga still immature until present day. Expulsion in Benakat Sub-basin started at 13 Ma while in Pigi Subbasin it started from 9.5 Ma. There are four migration patterns in Musi High, three charged from Benakat Subbasin and one charged from Pigi Subbasin. Migration for shallow clastic reservoir follows different patterns and is mostly controlled by vertical migration via fault surface. Hydrocarbon in the eastern part of Musi High will decrease in density following migration distance, however in the western part, the farther the distance, the density will become lighter. Seal rock has a big role in determining the hydrocarbon field pattern in Musi High.