HYDROCARBON SOURCE ROCK STUDY SOUTH SUMATRA BASIN, SOUTH SUMATRA PROVINCE BASED ON GEOCHEMISTRY DATA
The Western South Sumatra Extention block of South Sumatra Basin is a part of PT Medco E&P Indonesia’s operation area with main oil fields such as FRZ, SK and many others. Based on gamma ray and resistivity log analysis and also description of cutting and core from PT Medco E&P Indones...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/78487 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Western South Sumatra Extention block of South Sumatra Basin is a part of
PT Medco E&P Indonesia’s operation area with main oil fields such as FRZ, SK
and many others. Based on gamma ray and resistivity log analysis and also
description of cutting and core from PT Medco E&P Indonesia, South Sumatra
Basin consists of some formations. The three main formation analysed are Lemat
Formation, Talangakar Formation and Baturaja Formation. Lemat Formation was
deposited in fluviodeltaik environment with shale as a source rock. Talangakar
Formation also as a source rock, was deposited in fluvial - deltaic environment,
that consists of sandstone and shale intercalation with siltstone. Baturaja
Formation was deposited in marine or shallow marine environtment, consists of
carbonate sediments acting as a reservoir in Musi Platform area.
The structural geology of the research area is represented by seismic line through
wells SN – 1, RN – 1, SK – 3, FRZ – 3 and RBT deep - 1. The research area has
normal faults that control the deposition of sediments and several anticlines as a
result of compressional tectonic phase in Late Plio-Pleistocene.
Based on geochemical analysis with alkane, sterane, and triterpane biomarker on
oil samples and source rock, both of them show that oil from Musi Platform are formed by mixed organic material algal and terrestrial with fluvial - deltaic
depositional environment. It shows positive correlation between oil and source
rock from Lemat and Talangakar Formation and it was accumulated in the center
of Musi Platform area, Western South Sumatra Extention block, South Sumatra
Basin after migration process. The migration took place on stacking limestone
from Baturaja Formation and also through faults on Lemat and Talangakar
Formation. |
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