气候变化领域集成服务门户(CCPortal): Natural fractures in tight-oil sandstones: A case study of the upper triassic yanchang formation in the southwestern ordos basin, China

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DOI	10.1306/0130191608617115
	Natural fractures in tight-oil sandstones: A case study of the upper triassic yanchang formation in the southwestern ordos basin, China
	Lyu W.; Zeng L.; Zhou S.; Du X.; Xia D.; Liu G.; Li J.; Weng J.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:10
英文摘要	Natural fractures are important storage spaces and fluid-flow channels in tight-oil sandstones. Intraformational open fractures are the major channels for fluid flow in tight-oil sandstones. Small faults may provide fluid-flow channels across different layers. According to analogous outcrops, cores, and borehole image logs, small faults and intraformational open fractures are developed in the tight-oil sandstones of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin, China. Among them, high dip-angle intraformational open fractures are the most abundant. Northeast-southwest-trending fractures are the principal fractures for fluid flow because that is the present-day maximum horizontal compressive stress direction. Combined with production data, horizontal wells, striking normal to or at a large angle relative to the major flow pathways, are beneficial for tightoil production improvement. Fractures with high dip angles are the main factor that influences initial oil production. Linkage and tip damage zones are more favorable for oil production improvement than wall damage zones. This study provides an example of natural fracture characterization and unravels fracture contributions to reservoir physical properties and oil production of tight-oil sandstones, which could provide a geological basis for oil exploration and development in tight sandstones. © 2019 American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Boreholes; Channel flow; Compressive stress; Digital storage; Horizontal wells; Metamorphic rocks; Oil well logging; Petroleum prospecting; Petroleum reservoir engineering; Sandstone; Well logging; Borehole image logs; Different layers; Natural fracture; Ordos basin , China; Production improvement; Reservoir physical property; Tight sandstones; Yanchang Formation; Fracture; borehole logging; core analysis; dip-slip fault; fluid flow; fracture mechanics; oil production; outcrop; sandstone; storage structure; stress-strain relationship; Triassic; China; Ordos Basin
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125040
作者单位	State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China; Research Institute of Petroleum Exploration and Development, Huabei Branch Company, Sinopec, Zhengzhou, China; Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu, China
推荐引用方式 GB/T 7714	Lyu W.,Zeng L.,Zhou S.,et al. Natural fractures in tight-oil sandstones: A case study of the upper triassic yanchang formation in the southwestern ordos basin, China[J],2019,103(10).
APA	Lyu W..,Zeng L..,Zhou S..,Du X..,Xia D..,...&Weng J..(2019).Natural fractures in tight-oil sandstones: A case study of the upper triassic yanchang formation in the southwestern ordos basin, China.AAPG Bulletin,103(10).
MLA	Lyu W.,et al."Natural fractures in tight-oil sandstones: A case study of the upper triassic yanchang formation in the southwestern ordos basin, China".AAPG Bulletin 103.10(2019).