Crude oil properties and their biodegradation by microorganisms isolated from mangrove sediments
Distribution patterns of hydrocarbons in five crude oils from Bayan, D35, Baram and Bokor oilfields of Sarawak, and Semarang oilfield of Federal territory Labuan were analyzed using a combination of column chromatography and gas chromatographylflame ionization detector. These data were used to evalu...
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| Format: | Thesis |
| Language: | English |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/28022/1/Noor%20Kamala%20Jalia%20ft.pdf |
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| Summary: | Distribution patterns of hydrocarbons in five crude oils from Bayan, D35, Baram and Bokor oilfields of Sarawak, and Semarang oilfield of Federal territory Labuan were analyzed using a combination of column chromatography and gas chromatographylflame ionization detector. These data were used to evaluate the geochemical characteristics of crude oils. The five crude oils showed significant
differences in terms of thermal maturity, source rock, depositional environment and biodegradati7 All crude oils, except D35, possessed a strong predominance
of low molecular weight hydrocarbons with the ratios of I(C15 -C20)/I(C21-C34) above 1 are attributed to the terrestrial organic input. The ratio of I (C15
C:W)/~)C21-C34) for D35 crude oil less than 1 which suggest distribution pattern is a marine organic input. The maturity of crude oil was assessed based on carbon
preference indices (CPT) and the maturity sequence is: Semarang > Baram > Bayan > D35 > Bokor. Bayan and D35 crude oils can be assumed to originate from non-marine source rocks based on pristane/phytane ratios and may be
related to peat swamp depositional environment. Pristane/phytane ratios of Bokor crude oil indicate aquatic depositional environment under reducing
condition. On other hand, Baram and Semarang crude oils are assumed to be originated from marine source rocks and may be generated from mixture of marine and terrigenous depositional environment. Furthermore, statistical
analysis using cluster analysis (CA) showed that Baram, Bokor and Semarang crude oils originated from the same sources, while Bayan and D35 crude oils are
originated from another source. |
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