Seismic interpretation and sequence stratigraphy of the Phu Khanh Basin offshore Vietnam / Telakavati Lekshmanan
The Phu Khanh basin in offshore Vietnam is a frontier basin which has never been drilled. Seismic study study of Phu Khanh basin seismic indicates that it is a typical rift basin which comprises; 1) pre-rifting 2) rifting and basin inversion and finally 3) postrift sedimentation. Pre-rifting may...
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| Format: | Thesis |
| Published: |
2017
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| Online Access: | http://studentsrepo.um.edu.my/9587/1/Telakavati_Lekshmanan.pdf http://studentsrepo.um.edu.my/9587/5/Telakavati_Lekshmanan_%2D_Dissertation.pdf http://studentsrepo.um.edu.my/9587/ |
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| Summary: | The Phu Khanh basin in offshore Vietnam is a frontier basin which has never been
drilled. Seismic study study of Phu Khanh basin seismic indicates that it is a typical rift
basin which comprises; 1) pre-rifting 2) rifting and basin inversion and finally 3) postrift
sedimentation. Pre-rifting may have begun in the Late Cretaceous or Paleogene.
Rifting and basin inversion took place during the Late Oligocene, which was followed
by rifting till the Early Miocene. Post rift sedimentation took place from Middle to
Upper Miocene whereby marine transgression dominated the basin. Sea level during the
transgressive stage favored carbonate growth and was later followed by regression. The
regressive stage has seismic evidence of lowstand, less obvious transgressive and
distinct highstand tracts especially in the shallow part of the basin. Seismic data from
the Phu Khanh basin indicate occurrence of active fluid circulation due to
metamorphism during uplift of the mantle a x. The metamorphic fluid flow contributed
to volcanism and gas escape features seen in the data. Potential source of rocks are
believed to be present in the form of syn-rift lacustrine sediments. These sediments are
likely from the gas window. Post-rift deposits may also be potential source rock. Basin
floor fans, carbonate buildups, weathered basements, shallow water sands are
potentially good reservoirs in the Phu Khanh basin. Hydrocarbon indicators such as flat
spots, gas chimneys, polarity reversals are observed, which clearly indicates the
presence of hydrocarbon in the basin. |
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