Sedimentary characteristics and tectonic setting of sublacustrine fans in a half-graben rift depression, Beibuwan Basin, South China Sea

Liu, Entao, Wang, Hua, Li, Yuan, Zhou, Wei, Leonard, Nicole D., Lin, Zhengliang and Ma, Qinglin (2014) Sedimentary characteristics and tectonic setting of sublacustrine fans in a half-graben rift depression, Beibuwan Basin, South China Sea. Marine and Petroleum Geology, 52 9-21. doi:10.1016/j.marpetgeo.2014.01.008


Author Liu, Entao
Wang, Hua
Li, Yuan
Zhou, Wei
Leonard, Nicole D.
Lin, Zhengliang
Ma, Qinglin
Title Sedimentary characteristics and tectonic setting of sublacustrine fans in a half-graben rift depression, Beibuwan Basin, South China Sea
Journal name Marine and Petroleum Geology   Check publisher's open access policy
ISSN 0264-8172
1873-4073
Publication date 2014-04
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.marpetgeo.2014.01.008
Open Access Status
Volume 52
Start page 9
End page 21
Total pages 13
Place of publication London, United Kingdom
Publisher Elsevier
Collection year 2015
Language eng
Abstract Drilling has shown that there is a large petroleum reserve in the Liushagang Formation of the Fushan Depression, South China Sea from reservoirs of the sublacustrine fans. To reduce the risk associated with exploration, the sedimentary characteristics of the sublacustrine fans should be identified and described. Analysis of the drilling cores, well data and 3D seismic data was conducted to identify and interpret the sublacustrine fans which formed in a lacustrine succession as the low-stand fan of the 2nd member of Liushagang Formation (SQEls2). The reservoirs were commonly associated with pebbly conglomerates, mudstone shivers, muddy debris, various deformation structures including micro-faults, liquified deformation structure, ball and pillow structure, slump and stress-release deformation. Further contrastive analysis of sedimentary characteristics and palaeogeomorphology between the western and eastern sublacustrine fans indicates that they belong to two different types of sublacustrine system in continental basins. More specifically, the western fan, controlled by the multi-level step-fault belt, is a typical gravel-rich sublacustrine system which is characterised by structurally controlled, high gradient (2.8-3.3°), admixtures of muddy debris and pebbly conglomerates and poor reservoir quality, while the eastern fan, controlled by the flexure slope-break belt, is a sand-rich sublacustrine system dominated by relatively low gradient (2.0-2.5°), general fining-upwards trend with good reservoir quality. Therefore, the development of future exploration should be conducted at different levels in the Fushan Depression.
Keyword Fushan Depression
Gradient
Sedimentary characteristics
Sublacustrine fan
Tectonic setting
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2015 Collection
 
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Created: Tue, 04 Mar 2014, 00:15:41 EST by System User on behalf of School of Earth Sciences