Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea

doi:10.1007/s12583-009-0018-z

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea
	Sun Qiliang 1,2; Wu Shiguo 1,3; Yao Genshun 4; Lue Fuliang 4
刊名	JOURNAL OF EARTH SCIENCE
	2009-02-01
卷号	20 期号:1 页码:180-192
关键词	Polygonal Fault Qiongdongnan Basin Gas Chimney Composite Channel Migration Pathway
ISSN号	1674-487X
DOI	10.1007/s12583-009-0018-z
文献子类	Article
英文摘要	Based on high-resolution 3D seismic data, we document the polygonal faults within the Miocene Meishan (sic) Formation and Huangliu (sic) Formation of the Qiongdongnan (sic) basin, northern South China Sea. Within the seismic section and time coherent slice, densely distributed extensional faults with small throw and polygonal shape were identified in map view. The orientation of the polygonal faults is almost isotropic, indicating a non-tectonic origin. The deformation is clearly layer-bounded, with horizontal extension of 11.2% to 16%, and 13.2% on average. The distribution of polygonal faults shows a negative correlation with that of gas chimneys. The development of polygonal faults may be triggered by over-pressure pore fluid which is restricted in the fine-grained sediments of bathyal facies when the sediments is compacted by the burden above. The polygonal faults developed to balance the volumetric contraction and restricted extension. The product of hydrocarbon in the Meishan Formation may have contributed to the development of the polygonal faults. In the study area, it was thought that the petroleum system of the Neogene post-rift sequence is disadvantageous because of poor migration pathway. However, the discovery of polygonal faults in the Miocene strata, which may play an important role on the fluid migration, may change this view. A new model of the petroleum system for the study area is proposed.; Based on high-resolution 3D seismic data, we document the polygonal faults within the Miocene Meishan (sic) Formation and Huangliu (sic) Formation of the Qiongdongnan (sic) basin, northern South China Sea. Within the seismic section and time coherent slice, densely distributed extensional faults with small throw and polygonal shape were identified in map view. The orientation of the polygonal faults is almost isotropic, indicating a non-tectonic origin. The deformation is clearly layer-bounded, with horizontal extension of 11.2% to 16%, and 13.2% on average. The distribution of polygonal faults shows a negative correlation with that of gas chimneys. The development of polygonal faults may be triggered by over-pressure pore fluid which is restricted in the fine-grained sediments of bathyal facies when the sediments is compacted by the burden above. The polygonal faults developed to balance the volumetric contraction and restricted extension. The product of hydrocarbon in the Meishan Formation may have contributed to the development of the polygonal faults. In the study area, it was thought that the petroleum system of the Neogene post-rift sequence is disadvantageous because of poor migration pathway. However, the discovery of polygonal faults in the Miocene strata, which may play an important role on the fluid migration, may change this view. A new model of the petroleum system for the study area is proposed.
学科主题	Geosciences, Multidisciplinary
语种	英语
WOS记录号	WOS:000264753800018
公开日期	2010-12-22
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/3699]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.China Univ Petr, Coll Georesource & Informat, Qingdao 266555, Peoples R China 4.PetroChina Hangzhou Inst Geol, Hangzhou 310023, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Sun Qiliang,Wu Shiguo,Yao Genshun,et al. Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea[J]. JOURNAL OF EARTH SCIENCE,2009,20(1):180-192.
APA	Sun Qiliang,Wu Shiguo,Yao Genshun,&Lue Fuliang.(2009).Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea.JOURNAL OF EARTH SCIENCE,20(1),180-192.
MLA	Sun Qiliang,et al."Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea".JOURNAL OF EARTH SCIENCE 20.1(2009):180-192.