Print this pageAbstract: Late Mesozoic to Tertiary Basin Evolution along the South-East Continental Shelf of Vietnam
DIEN, PHAN TRUNG, Vietnam Petroleum Institute - Petrovietnam; PHUNG SY TAI, Vietnam Petroleum Institute - Petrovietnam; NGUYEN VAN DZUNG, Vietnam Petroleum Institute - Petrovietnam; DO VAN NHUAN, Hanoi University of Mining and Geology
SUMMARY
The geologic evolution of the south-east continental shelf of Vietnam has lead to formation of petroleum systems, not only in Tertiary sediments, but also of petroleum bearing reservoirs in the Late-Mesozoic plutonic-volcanic basement. The cohered basement of the Tertiary Basins was formed by the closure of the Tethys Ocean that lead to continental convergence in the Late-Mesozoic evolution stages.
The Tertiary Basins are characterized by graben-depression structures caused by Oligocene rifting and Miocene sagging. Oligocene sediments in the central grabens are composed of lacustrine and tidal-lagoonal fine grained clastics; some of these are good reservoir targets. Other sequences are characterized by tidal-lagoonal shales, which are both source rocks and effective caprocks. Miocene sediments are widely distributed throughout the Cuu Long and Nam Con Son Tertiary Basins. The Miocene sediments of Cuu Long Basin are represented by high-destructive deltaic clastics; but marine clastics and carbonate predominate in the Nam Con Son Basin.
The association of Oligocene source rocks and Oligo-Miocene seal, with both plutonic-volcanic basement and Oligo-Miocene clastic and reef-carbonate reservoirs, is common throughout the south-east continetal shelf of Vietnam.
AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah