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Quantitative Seismic Geomorphology of Early Miocene to Pleistocene Fluvial System of Northern Songkhla Basin, Gulf of Thailand |
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| รหัสดีโอไอ | |
| Creator | Oanh Thi Tran |
| Title | Quantitative Seismic Geomorphology of Early Miocene to Pleistocene Fluvial System of Northern Songkhla 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. | 80-88 |
| Keyword | Songkhla basin, Quantitative seismic geomophology, fluvial system |
| URL Website | https://www.bestjournal.org/ |
| Website title | Bulletin of Earth Sciences of Thailand |
| ISSN | 1906-280X |
| Abstract | Songkhla basin is located in southwestern part of the Gulf of Thailand. This is one of the hydrocarbon producing basins of Thailand. Reservoirs are sand systems of fluvial depositional environment. This study reports seismic geomorphologic analysis of the northern part of the basin from Early Miocene to Pleistocene. I applied quantitative seismic geomorphology approach to characterize and understand the channel systems in the area. In Early Miocene and from Late Miocene to Pleistocene large meander belts with an average size of 2014m and 1490m respectively were observed, whereas, in the Middle Miocene an average size of meander belt is 573m. Similarly, width to depth ratios are also significantly small (average 6) in the Middle Miocene. Large meander belts in Early Miocene may be due to prevailing syn-rift phase in the area. Narrow channel belts and very low width to depth ratios in Middle Miocene are the result of low accommodation. In Middle Miocene most of the tectonic activity stopped along the syn-rift faults within the area. Low width to depth ratios may be due to base level rise near delta plains. Relatively large meandering belts with large width to depth ratio developed from Late Miocene to Pleistocene. Sea level changes (drop at upper Middle Miocene) coupled with thermal subsidence controlled the channel morphology in this period. Relationship between sinuosity, meander belt width, channel width and channel depth were analyzed. These observations have important implications for understanding the heterogeneity of fluvial systems and provide useful information for application in hydrocarbon field development. |
