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

IOCAS-IR

	Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea
	Sun QL(孙启良); Wu SG(吴时国); Yao GS(姚根顺); Lv FL(吕福亮)
发表期刊	Journal of Earth Science
ISSN	1674-487X
	2009-02-15
出版年	2009
卷号	v.20 期号:01 页码:184-196
文献类型	CNKI期刊论文
摘要	Based on high-resolution 3D seismic data, we document the polygonal faults within the Miocene Meishan (梅山) Formation and Huangliu (黄流) Formation of the Qiongdongnan (琼东南) ba-sin, 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, whichmay play an important role on the fluid migra-tion, may change this view. A new model of the petroleum system for the study area is proposed.
关键词	polygonal fault, Qiongdongnan basin, gas chimney, composite channel, migra-tion pathway.
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P736
语种	英文;
资助项目(基金）	supported by the Formation Mechanism and Study on Geophysical Recognition Technology of Shallow Water Flow (No. 2006AA09Z349) ; the CAS Knowledge Inno-vation Program (No. KZCX2-YW-203), the National Basic Research Program of China (No. 2007CB411703) ; the MLR National Petroleum Resource Strategic Target Survey and Evaluation Program ; the Taishan Scholarship Program of Shandong Province.
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/192685
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences,Qingdao266071,China 2.GraduateUniversityofChineseAcademyofSciences,Beijing100049,China 3.CollegeofGeoresourceandInformation,ChinaUniversityofPetroleum,Qingdao266555,China 4.PetroChinaHangzhouInstituteofGeology,Hangzhou310023,China
推荐引用方式 GB/T 7714	Sun QL,Wu SG,Yao GS,et al. Characteristics and Formation Mechanism of Polygonal Faults in Qiongdongnan Basin, Northern South China Sea. 2009.