Geological evolution,regional perspectives and hydrocarbon potential of the northwest Phu Khanh Basin,offshore Central Vietnam |
| |
Authors: | Michael BW Fyhn Lars H Nielsen Lars O Boldreel Le D Thang Jørgen Bojesen-Koefoed Henrik I Petersen Nguyen T Huyen Nguyen A Duc Nguyen T Dau Anders Mathiesen Ian Reid Dang T Huong Hoang A Tuan Le V Hien Hans P Nytoft Ioannis Abatzis |
| |
Institution: | 1. Department of Geography and Geology, University of Copenhagen, Geocenter Copenhagen, Øster Voldgade 10, 1350K, Denmark;2. Geological Survey of Denmark and Greenland, GEUS, Geocenter Copenhagen, Øster Voldgade 10, 1350K, Denmark;3. Vietnam Petroleum Institute (VPI), Trung Kinh Street, Yen Hoa, Cau Giay, Hanoi, Vietnam |
| |
Abstract: | Seismic stratigraphic and structural analyses of the northwest Phu Khanh Basin, offshore Central Vietnam, based on 2-D seismic data, indicate that the initial rifting began during the latest Cretaceous? or Palaeogene controlled by left-lateral transtension along the East Vietnam Boundary Fault Zone (EVBFZ) and northwest–southeast directed extension east of the EVBFZ. Rifting stopped due to transpression during middle Oligocene times but resumed by left-lateral transtension during the Late Oligocene. Thick sequences of lacustrine and alluvial sediments were deposited during the Palaeogene rift periods. The Late Oligocene rifting ended due to inversion, triggered by right-lateral wrenching near the Palaeogene–Neogene boundary. Following the onset of this inversion regional uplift and volcanism took place in the southern half of the study area and contemporaneous subsidence and transgression took place farther north, leading to widespread carbonate deposition. As the right-lateral wrenching decreased during the early Neogene, thermal subsidence and siliciclastic sedimentation became dominant, resulting in the buildup and southward propagation of the shelf slope. Sediment accumulation and subsidence rates increased after the Middle Miocene times due to eastward tilting of Central Vietnam and the adjacent offshore area. |
| |
Keywords: | Phu Khanh Basin Extrusion tectonics Basin analysis Seismic facies analysis Hydrocarbon assessment Vietnam South China Sea |
本文献已被 ScienceDirect 等数据库收录! |
|