The tight oil of lacustrine carbonate-rich rocks in the Eocene Shulu Sag: Implications for lithofacies and reservoir characteristics

doi:10.1016/j.petrol.2018.12.028

	The tight oil of lacustrine carbonate-rich rocks in the Eocene Shulu Sag: Implications for lithofacies and reservoir characteristics
	Kong, Xiangxin 1; Jiang, Zaixing 1; Han, Chao 2; Zheng, Lijing 3; Zhang, Jianguo 1
刊名	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
	2019-04-01
卷号	175 页码:547-559
关键词	Tight oil Calcilutite Conglomerate Lithofacies Reservoir
ISSN号	0920-4105
DOI	10.1016/j.petrol.2018.12.028
英文摘要	Tight oil has been discovered in calcilutite and carbonate conglomerate reservoirs in the lower part of the third member of the Eocene Shahejie Formation of the Shulu Sag, Bohai Bay Basin, Northern China. Understanding the nature of lithofacies is essential to evaluating the quality of tight reservoirs. This study analyzed the sedimentary characteristics, geochemistry, and reservoir characteristics of each lithofacies based on thin-section and fieldemission-scanning electron microscope observations combined with X-ray diffraction, geochemical parameter, and physical property analysis. Eight lithofacies were identified: (1) varve-like laminated calcilutite, (2) non-regular laminated calcilutite, (3) interlaminated calcisiltite-calcilutite, (4) massive calcilutite, (5) massive calcisiltite-calcarenite, (6) grain-supported carbonate nconglomerate, (7) matrix-supported carbonate conglomerate, and (8) mixed-source carbonate conglomerate. The varve-like laminated calcilutites have intrabasinal organic matter with a low Pr/Ph ratio (0.50-0.63) and high gammacerane/C-31 homohopane (0.13-0.29), indicating that they are normal sediments and have good hydrocarbon generation potential. The other lithofacies are event sediments containing a certain amount of terrestrial organic matter. Laminated, organic-rich lithofacies develop organic matter pores and other storage spaces modified by organic acid. Their reservoir quality is better than that of massive or organic matter-lean lithofacies. The conglomerates containing less matrices have better reservoir quality than conglomerates with high matrix contents. The hydrocarbon generation ability and reservoir quality of lithofacies as well as the fracture density are the key factors that control the formation of tight oil reservoirs in the Shulu Sag.
资助项目	National Major Research Program for Science and Technology of China[2017ZX05009-002] ; Natural Science Foundation[41772090]
WOS关键词	BOHAI BAY BASIN ; BLACK SHALE ; GEOCHEMICAL CHARACTERISTICS ; PYROLYSIS ; SEQUENCE ; FACIES ; SYSTEM ; CHINA ; PORE ; HYDROCARBONS
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000458153000045
资助机构	National Major Research Program for Science and Technology of China ; National Major Research Program for Science and Technology of China ; Natural Science Foundation ; Natural Science Foundation ; National Major Research Program for Science and Technology of China ; National Major Research Program for Science and Technology of China ; Natural Science Foundation ; Natural Science Foundation ; National Major Research Program for Science and Technology of China ; National Major Research Program for Science and Technology of China ; Natural Science Foundation ; Natural Science Foundation ; National Major Research Program for Science and Technology of China ; National Major Research Program for Science and Technology of China ; Natural Science Foundation ; Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90555]
专题	中国科学院地质与地球物理研究所
通讯作者	Jiang, Zaixing; Zhang, Jianguo
作者单位	1.China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China 2.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Kong, Xiangxin,Jiang, Zaixing,Han, Chao,et al. The tight oil of lacustrine carbonate-rich rocks in the Eocene Shulu Sag: Implications for lithofacies and reservoir characteristics[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2019,175:547-559.
APA	Kong, Xiangxin,Jiang, Zaixing,Han, Chao,Zheng, Lijing,&Zhang, Jianguo.(2019).The tight oil of lacustrine carbonate-rich rocks in the Eocene Shulu Sag: Implications for lithofacies and reservoir characteristics.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,175,547-559.
MLA	Kong, Xiangxin,et al."The tight oil of lacustrine carbonate-rich rocks in the Eocene Shulu Sag: Implications for lithofacies and reservoir characteristics".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 175(2019):547-559.