Further Understanding of Relationship between Fault Characteristics and Hydrocarbon Accumulation in Binchang Area, Ordos Basin

被引：0
作者：
He, Faqi [1 ]
Qi, Rong [1 ]
Yuan, Chunyan [1 ]
Yang, Fei [1 ]
Li, Xiaowei [1 ]
机构：
[1] SINOPEC North China Oil and Gas Branch, Zhengzhou
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2024年 / 49卷 / 11期
关键词：
activity period; Binchang area; fault‐fracture clastic reservoir; Ordos basin; petroleum geology; strike‐slip fault; tectonics;
D O I：
10.3799/dqkx.2022.256
中图分类号：
学科分类号：
摘要：
The relationship between fault characteristics and hydrocarbon accumulation in southern Ordos basin remains poorly understood though it has been a hot topic for a long time. It was thought that less faults are developed in southern Ordos basin, so stratigraphic and lithologic reservoirs are primary exploration target. However, lots of strike slip faults with big dip, small throws are found as exploration technology improves. Taking the strike-slip fault in Binchang area on the southwest margin of Ordos basin as the research object, using the fine anatomy of fault geometry and kinematics characteristics, combined with the basin structural evolution characteristics, the fault activity period is determined, and the relationship between the structural characteristics of strike-slip fault and hydrocarbon accumulation is discussed. The study shows that the study area can be divided into three structural layers vertically: lower structural layer (Tg ‒ T9), middle structural layer (T9 ‒ T5), and upper structural layer (above T5). The fault characteristics of the three structural layers show obvious differences, but also have certain similarity and inheritance. The lower structural layer is mainly influenced by Caledonian and Hercynian movements, the middle structural layer is mainly influenced by Indosinian movement, and the upper structural layer is mainly influenced by Yanshanian and Himalayan movements. In general, the development of NEE faults in the study area is obviously inherited and strengthened from bottom to top, while the development of NW faults is gradually weakened. The present fault patterns were mainly formed in the Yanshanian period. In addition, the major fault in the study area is obviously characterized by segmental activity. The complex fault system and the two regional unconformities (T9 and T5) control the Paleozoic and Mesozoic hydrocarbon accumulation systems in the study area. Plenty of faults and fractures provided the seepage channels and storage space for the Mesozoic tight reservoirs with low permeability, resulting in the formation of lots of fault-fracture clastic reservoirs. The fracture development level and local structural high points control the high-yield and enrichment of fault-fracture clastic reservoirs. © 2024 China University of Geosciences. All rights reserved.
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页码：4082 / 4097
页数：15
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