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Vu A.T.,Vietnam Petroleum Institute VPI | Wessel Fyhn M.B.,Geological Survey of Denmark | Xuan C.T.,Vietnam Petroleum Institute VPI | Nguyen T.T.,Vietnam Petroleum Institute VPI | And 3 more authors.
Marine and Petroleum Geology | Year: 2017

The East Vietnam Boundary Fault Zone (EVBFZ) forms the seaward extension of the Red River Shear Zone and interacted with the extensional rift systems in basins along the Central Vietnamese continental margin. The structural outline of the central Vietnamese margin and the timing of deformation are therefore fundamental to understanding the development of the South China Sea and its relation to Indochinese escape tectonism and the India-Eurasia collision. This study investigates the structural and stratigraphic evolution of the Central Vietnamese margin in a regional tectonic perspective based on new 2-D seismic and well data. The basin fill is divided into five major Oligocene to Recent sequences separated by unconformities. Deposition and the formation of unconformities were closely linked with transtension, rifting, the opening of the South China Sea and Late Neogene uplift and denudation of the eastern flank of Indochina. The structural outline of the Central Vietnamese margin favors a hybrid tectonic model involving both escape and slab-pull tectonics. Paleogene left-lateral transtension over the NNW-striking EVBFZ, occurred within the Song Hong Basin and the Quang Ngai Graben and over the Da Nang Shelf/western Phu Khanh Basin, related to the escape of Indochina. East of the EVBFZ, Paleogene NE-striking rifting prevailed in the outer Phu Khanh Basin and the Hoang Sa Graben fitting best with a prevailing stress derived from a coeval slab-pull from a subducting proto-South China Sea beneath the southwest Borneo – Palawan region. Major rifting terminated near the end of the Oligocene. However, late stage rifting lasted to the Early Miocene when continental break-up and seafloor spreading commenced along the edge of the outer Phu Khanh Basin. The resulting transgression promoted Lower and Middle Miocene carbonate platform growth on the Da Nang Shelf and the Tri Ton High whereas deeper marine conditions prevailed in the central part of the basins. Partial drowning and platform retreat occurred after the Middle Miocene due to increased siliciclastic input from the Vietnamese mainland. As a result, siliciclastic, marine deposition prevailed offshore Central Vietnam during the Pliocene and Pleistocene. © 2017 Elsevier Ltd


Dau P.T.,Ehime University | Dau P.T.,Vietnam Petroleum Institute VPI | Sakai H.,Ehime University | Hirano M.,Ehime University | And 6 more authors.
Toxicological Sciences | Year: 2013

The constitutive androstane receptor (CAR) not only displays a high basal transcriptional activity but also acts as a ligand-dependent transcriptional factor. It is known that CAR exhibits different ligand profiles across species. However, the mechanisms underlying CAR activation by chemicals and the species-specific responses are not fully understood. The objectives of this study are to establish a high-throughput tool to screen CAR ligands and to clarify how CAR proteins from the Baikal seal (bsCAR) and the mouse (mCAR) interact with chemicals and steroid receptor coactivator 1 (SRC1). We developed the surface plasmon resonance (SPR) system to assess quantitatively the interaction of CAR with potential ligands and SRC1. The ligand-binding domain (LBD) of bsCAR and mCAR was synthesized in a wheat germ cell-free system. The purified CAR LBD was then immobilized on the sensor chip for the SPR assay, and the kinetics of direct interaction of CARs with ligand candidates was measured. Androstanol and androstenol, estrone, 17β-estradiol, TCPOBOP, and CITCO showed compound-specific but similar affinities for both CARs. The CAR-SRC1 interaction was ligand dependent but exhibited a different ligand profile between the seal and the mouse. The results of SRC1 interaction assay accounted for those of our previous in vitro CAR-mediated transactivation assay. In silico analyses also supported the results of CAR-SRC1 interaction; there is little structural difference in the ligand-binding pocket of bsCAR and mCAR, but there is a distinct discrimination in the helix 11 and 12 of these receptors, suggesting that the interaction of ligand-bound CAR and SRC1 is critical for determining species-specific and ligand-dependent transactivation over the basal activity. The SPR assays demonstrated a potential as a high-throughput screening tool of CAR ligands. © The Author 2012. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved.


Nguyen S.T.,National University of Singapore | Feng J.,National University of Singapore | Le N.T.,Vietnam Petroleum Institute VPI | Le A.T.T.,Vietnam Petroleum Institute VPI | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2013

Polyprolylene is commonly used for crude oil spill cleaning, but it has low absorption capacity and is nonbiodegradable. In our work, a green, ultralight, and highly porous material was successfully prepared from paper waste cellulose fibers. The material was functionalized with methyltrimethoxysilane (MTMS) to enhance its hydrophobicity and oleophilicity. Water contact angles of 143 and 145 were obtained for the MTMS-coated recycled cellulose aerogel. The aerogel achieved high absorption capacities of 18.4, 18.5, and 20.5 g/g for three different crude oils at 25 C, respectively. In the investigated temperature range of 10, 25, 40, and 60 C for the absorption of the tested crude oil on the aerogel, a highest absorption capacity of 24.4 g/g was obtained. It was found that the viscosity of the crude oils is the main factor affecting their absorption onto the aerogel. The strong affinity of the MTMS-coated recycled cellulose aerogel to the oils makes the aerogel a good absorbent for crude oil spill cleaning. © 2013 American Chemical Society.


Giao P.H.,Asian Institute of Technology | Do D.Q.,Vietnam Petroleum Institute VPI
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Almost 30 years have passed since the first oil was produced from the fractured granite basement offshore Southern Vietnam there are still many questions left to be answered for this special type of reservoir and its fracture system characterization. In this study, we tried to investigate the contributions of micro-fracture and macro-fracture porosity by revisiting and deriving the coefficient of porosity partitioning and applying for a case study in the Cuu long basin.


Petersen H.I.,Geological Survey of Denmark | Nytoft H.P.,Geological Survey of Denmark | Fyhn M.B.W.,Geological Survey of Denmark | Dau N.T.,Vietnam Petroleum Institute VPI | And 3 more authors.
Society of Petroleum Engineers - International Petroleum Technology Conference 2012, IPTC 2012 | Year: 2012

The Vietnamese shelf contains several petroleum-producing Cenozoic rift basins, including the Song Hong, Cuu Long, Nam Con Son, and Malay-Cho Thu basins. This study describes geochemical data of oils and condensates from these basins, including new data from the Song Hong and Malay-Tho Chu basins, and demonstrates the variability in composition and source of the petroleum. The results contribute to a better understanding of oil types and petroleum-generating source rocks offshore Vietnam. All investigated samples contain angiosperm biomarkers (e.g. oleanane, bicadinane) indicating sourcing from post-Late Cretaceous source rocks. The Cuu Long Basin is the major oil-producing basin in Vietnam and the highly paraffinic oils have a lacustrine source (high TPP ratios, low C 31R/C 30 hopane ratios, Pr/Ph ratios of 2-1) and were generated from rocks within the early- to mid-oil window. Lacustrine oils are also known from wells at the northern margin of the Song Hong Basin, and analyses of offshore condensate discoveries show they were generated from relatively mature lacustrine source rocks. However, oil with a conspicuous coaly biomarker signature occurs in the Nam Con Son Basin. Further, a number of the condensates from the Song Hong Basin contain high proportions of higher land plant biomarkers suggesting significant contributions from coaly source rocks. Recently analysed oils from the Malay-Cho Thu Basin (northern margin of the Malay Basin) have likewise a geochemical composition strongly suggesting a coaly source (high wax, Pr/Ph ratios up to >10, dominance of C 29 steranes). Hence, new data together with previous data emphasize that coaly source rocks are important petroleum producers on the Vietnamese shelf. Coal-bearing strata in the syn- and post-rift successions in the Cenozoic basins should thus be considered as important additional source rocks offshore Vietnam. Copyright 2011, International Petroleum Technology Conference.


Phan B.M.Q.,Vietnam Petroleum Institute VPI | Ha Q.L.M.,Vietnam Petroleum Institute VPI | Le N.P.,Vietnam Petroleum Institute VPI | Ngo P.T.,Vietnam Petroleum Institute VPI | And 5 more authors.
Catalysis Letters | Year: 2015

Hydrodeoxygenation (HDO) of guaiacol (GUA), has been carried out over γ-Al2O3, CeO2, SBA-15 supported NiMo catalysts in an autoclave at 250°C and a hydrogen pressure of 5 MPa. In comparison with NiMo/γ-Al2O3, both NiMo/CeO2 and NiMo/SBA-15 catalysts showed their higher activities. NiMo/SBA-15 has been found to be the most potential one for HDO of GUA with GUA conversion and HDO degree of 90 and 67.5 %, respectively. The main product was cyclohexane with its yield of 56 mol%. The outstanding activity of this catalyst results from a high dispersion of its active sites on SBA-15 as catalyst support. For CeO2 supported catalyst, some interactions of Ce-Mo can be occurred, leading to an enhancement of its HDO performance. Graphical Abstract: [Figure not available: see fulltext.] © 2014 Springer Science+Business Media New York.

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