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Evaluation of the Petroleum Systems in the Lanta-Similan Area, Northern Pattani Basin, Gulf of Thailand |
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| รหัสดีโอไอ | |
| Creator | Sirajum Munira |
| Title | Evaluation of the Petroleum Systems in the Lanta-Similan Area, Northern Pattani Basin, Gulf of Thailand |
| Contributor | - |
| Publisher | Department of Geology, Chulalongkorn University |
| Publication Year | 2556 |
| Journal Title | Bulletin of Earth Sciences of Thailand (BEST) |
| Journal Vol. | 6 |
| Journal No. | 2 |
| Page no. | 122-130 |
| Keyword | Transgressive, Fluvial system, Shallow Marine system, back-filled distributary channel |
| URL Website | https://www.bestjournal.org/ |
| Website title | Bulletin of Earth Sciences of Thailand |
| ISSN | 1906-280X |
| Abstract | The presence of mature source rocks and numerous structural traps along the Lanta and Similan structural trends on the northwestern margin of the Pattani Basin make this area highly prospective for hydrocarbons. To analyze the factors which control hydrocarbon distribution and develop a petroleum system model for this study area 3D seismic data integrated with exploration and production well log data were used. Well log analysis was used for petrophysical evaluation and stratigraphic correlations and seismic data used for structural style interpretation. The results show hydrocarbons tend to be trapped better on up-thrown fault blocks than the down-thrown fault blocks. Moreover, lower net to gross sand percentages are evidence for good sealing capacity towards the eastern basinward part of the area compared to the higher sand percentage areas seen on the western basin flank. Vertical migration was dominant near the thicker source rocks and higher maturation levels in the eastern part whereas lateral migration pathways are limited to the west and southwestern part. Furthermore, small fault throws can leak out hydrocarbons in this area. Sand thickness is fairly uniform throughout the area and does not appear to be a factor in influencing the variable pay distribution of hydrocarbons. From this integrated analysis, it is observed that the probability of higher prospective areas is in the east along the Lanta trend due to the higher mature source rock with dominant vertical migration pathways, prominent up-thrown faults creating three-way dip closures and lower net to gross sand percentages. In comparison, the western side along the Similan trend has lower probability of prospectiveness. The northern Similan trend has better potential for hydrocarbons than the south because of greater fault throws leading to better sealing capacity. |
