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The tight oil of lacustrine carbonate-rich rocks in the Eocene Shulu Sag: Implications for lithofacies and reservoir characteristics
Kong, Xiangxin1; Jiang, Zaixing1; Han, Chao2; Zheng, Lijing3; Zhang, Jianguo1
2019-04-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume175Pages:547-559
AbstractTight 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.
KeywordTight oil Calcilutite Conglomerate Lithofacies Reservoir
DOI10.1016/j.petrol.2018.12.028
Funding OrganizationNational 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
WOS KeywordBOHAI BAY BASIN ; BLACK SHALE ; GEOCHEMICAL CHARACTERISTICS ; PYROLYSIS ; SEQUENCE ; FACIES ; SYSTEM ; CHINA ; PORE ; HYDROCARBONS
Language英语
Funding ProjectNational Major Research Program for Science and Technology of China[2017ZX05009-002] ; Natural Science Foundation[41772090]
Funding OrganizationNational 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
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000458153000045
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90555
Collection中国科学院地质与地球物理研究所
Corresponding AuthorJiang, Zaixing; Zhang, Jianguo
Affiliation1.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
Recommended Citation
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.
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