NDLI: Geology and hydrocarbon accumulations in the deepwater of the northwestern South China Sea

Content Provider	Springer Nature Link
Author	Wang, Zhenfeng Sun, Zhipeng Zhang, Daojun Zhu, Jitian Li, Xushen Huang, Baojia Guo, Minggang Jiang, Rufeng
Copyright Year	2015
Abstract	The deepwater of the northwestern South China Sea is located in the central to southern parts of the Qiongdongnan Basin (QDN Basin), which is a key site for hydrocarbon exploration in recent years. In this study, the authors did a comprehensive analysis of gravity-magnetic data, extensive 3D seismic survey, cores and cuttings, paleontology and geochemical indexes, proposed the mechanism of natural gas origin, identified different oil and gas systems, and established the model of hydrocarbon accumulations in the deep-water region. Our basin tectonic simulation indicates that the evolution of QDN Basin was controlled by multiple-phased tectonic movements, such as Indochina-Eurasian Plate collision, Tibetan Uplift, Red River faulting and the expansion of the South China Sea which is characterized by Paleogene rifting, Neogene depression, and Eocene intensive faulting and lacustrine deposits. The drilling results show that this region is dominated by marineterrestrial transitional and neritic-bathyal facies from the early Oligocene. The Yacheng Formation of the early Oligocene is rich in organic matter and a main gas-source rock. According to the geological-geochemical data from the latest drilling wells, Lingshui, Baodao, Changchang Sags have good hydrocarbon-generating potentials, where two plays from the Paleogene and Neogene reservoirs were developed. Those reservoirs occur in central canyon structural-lithologic trap zone, Changchang marginal trap zone and southern fault terrace of Baodao Sag. Among them, the central canyon trap zone has a great potential for exploration because the various reservoirforming elements are well developed, i.e., good coal-measure source rocks, sufficient reservoirs from the Neogene turbidity sandstone and submarine fan, faults connecting source rock and reservoirs, effective vertical migration, late stage aggregation and favorable structural–lithological composite trapping. These study results provide an important scientific basis for hydrocarbon exploration in this region, evidenced by the recent discovery of the significant commercial LS-A gas field in the central canyon of the Lingshui Sag.
Starting Page	57
Ending Page	70
Page Count	14
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	34
Issue Number	10
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2015-09-24
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	South China Sea deepwater natural gas petroleum system central canyon reservoir-forming conditions Qiongdongnan Basin Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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