Geological evolution, regional perspectives and hydrocarbon potential of the northwest Phu Khanh Basin, offshore Central Vietnam
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Geological evolution, regional perspectives and hydrocarbon potential of the northwest Phu Khanh Basin, offshore Central Vietnam. / Fyhn, Michael Bryld Wessel; Nielsen, Lars H.; Boldreel, Lars Ole; Thang, Le. D.; Bojesen-Koefoed, Jørgen; Petersen, Henrik I.; Huyen, Nguyen t,; Due, Nguyen A.; Dau, Nguyen T.; Mathiesen, Anders; Reid, Ian Derry; Huong, Dang T.; Tuan, Hoang A.; Hien, Le V.; Nytoft, Hans P.; Abatzis, Ioannis.
In: Marine and Petroleum Geology, Vol. 26, 2009, p. 1-24.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Geological evolution, regional perspectives and hydrocarbon potential of the northwest Phu Khanh Basin, offshore Central Vietnam
AU - Fyhn, Michael Bryld Wessel
AU - Nielsen, Lars H.
AU - Boldreel, Lars Ole
AU - Thang, Le. D.
AU - Bojesen-Koefoed, Jørgen
AU - Petersen, Henrik I.
AU - Huyen, Nguyen t,
AU - Due, Nguyen A.
AU - Dau, Nguyen T.
AU - Mathiesen, Anders
AU - Reid, Ian Derry
AU - Huong, Dang T.
AU - Tuan, Hoang A.
AU - Hien, Le V.
AU - Nytoft, Hans P.
AU - Abatzis, Ioannis
N1 - Online and pre-print version
PY - 2009
Y1 - 2009
N2 - 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 andvolcanism 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 andsiliciclastic 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. Potential direct hydrocarbon indicators (DHIs) in the Phu Khanh Basin include common amplitude anomalies, gas chimney-like features and seafloor gas seeps. In addition, oil seeps are found at Dam Thi Nai, immediately landward of the basin. Geochemical analyses of the oil seeps indicate the existence of at least two early to peak mature source rocks. Maturation modelling, combined with the seismic analysis, suggests the likely presence of oil kitchens 40-50km downdip in the basin, and a fairly simple oil migration route. The basin is probably charged from lacustrine syn-rift mudstones, humic coals and fore-reef marls. Potential reservoirs are turbidite, lowstand delta, shelf and coastal sandstones, as well as platform and reef carbonates and fractured basement. Various structural and stratigraphic traps formed during the Palaeogene and early Neogene, prior to the main stage of petroleum generation.
AB - 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 andvolcanism 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 andsiliciclastic 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. Potential direct hydrocarbon indicators (DHIs) in the Phu Khanh Basin include common amplitude anomalies, gas chimney-like features and seafloor gas seeps. In addition, oil seeps are found at Dam Thi Nai, immediately landward of the basin. Geochemical analyses of the oil seeps indicate the existence of at least two early to peak mature source rocks. Maturation modelling, combined with the seismic analysis, suggests the likely presence of oil kitchens 40-50km downdip in the basin, and a fairly simple oil migration route. The basin is probably charged from lacustrine syn-rift mudstones, humic coals and fore-reef marls. Potential reservoirs are turbidite, lowstand delta, shelf and coastal sandstones, as well as platform and reef carbonates and fractured basement. Various structural and stratigraphic traps formed during the Palaeogene and early Neogene, prior to the main stage of petroleum generation.
KW - Faculty of Science
KW - Vietnam
KW - Phu Khanh Basin
KW - South China Sea
KW - Vietnam
KW - Hydrocarbon assessment
KW - Seismic facies analysis
KW - Basin analysis
KW - Extrusion tectonics
U2 - 10.1016/j.marpetgeo.2007.07.014
DO - 10.1016/j.marpetgeo.2007.07.014
M3 - Journal article
VL - 26
SP - 1
EP - 24
JO - Marine and Petroleum Geology
JF - Marine and Petroleum Geology
SN - 0264-8172
ER -
ID: 1830230