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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
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
Wenya Lyu,1 Lianbo Zeng,2 Sibin Zhou,3 Xiaosheng Du,4 Dongling Xia,5 Guoping Liu,6 Jian Li,7 and Jianqiao Weng8
1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China; [email protected], [email protected]
2State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China; [email protected]
3Research Institute of Petroleum Exploration and Development, Huabei Branch Company, Sinopec, Zhengzhou, China; [email protected]
4Research Institute of Petroleum Exploration and Development, Huabei Branch Company, Sinopec, Zhengzhou, China; [email protected]
5Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; [email protected]
6State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China; [email protected]
7State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China; [email protected]
8State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu, China; [email protected]
ABSTRACT
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 tight-oil 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.
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