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Architecture and Depositional Environment of Fluvial Systems of Southern Songkhla Basin, Gulf of Thailand |
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| รหัสดีโอไอ | |
| Creator | Toan Manh Do |
| Title | Architecture and Depositional Environment of Fluvial Systems of Southern 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. | 131-141 |
| Keyword | Seismic geomorphology, sand distribution, fluvial system, Songkhla Basindistributary channel |
| URL Website | https://www.bestjournal.org/ |
| Website title | Bulletin of Earth Sciences of Thailand |
| ISSN | 1906-280X |
| Abstract | Songkhla Basin lies at the southwestern part of the Gulf of Thailand. This study reports depositional architecture and environment of Early Miocene to Pleistocene sequence of the southern part of the Songkhla Basin by integrating seismic geomorphology, well log data and available biostratigraphic data. I applied RMS attribute, Inversion analysis and spectral decomposition analysis to improve the image of seismic horizon and time slices for mapping fluvial systems in the area. Seven horizon slices and twenty six computed strata slices in between horizons were analysed. Measurements have been made for key elements of fluvial systems. Early Miocene has large channel belts. The channel morphology is controlled by rifting of the basin. In Middle Miocene, narrow channels are observed. The change in style is due to low accommodation in late syn-rift to post-rift period. Broader channels are located from Top Middle Miocene to Pleistocene. In the absence of any tectonic activity other than slight subsidence, the channel morphology may be attributed to sea level drop at Top of the Middle Miocene. Biostratigraphic data reveals that Middle Miocene interval has marine influence and its intensity increases towards east. In shallow section at upper Middle Miocene and Pleistocene tidal creeks were observed on seismic images. This indicates marine influence in this time. Moreover, biostratigraphic data also support this. Early Miocene sequence in the southern part of the basin does not have any marine influence. |
