Analysis of tight oil accumulation mechanism of Chang 7 member in the Ordos basin

被引：0
|
作者：
Qu T. [1 ,2 ]
Gao G. [1 ,2 ]
Liang X. [3 ,4 ]
Sun M. [1 ,2 ]
You Y. [3 ,4 ]
Dang W. [1 ,2 ]
Dan W. [3 ,4 ]
机构：
[1] College of Geosciences, China University of Petroleum (Beijing), Beijing
[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing
[3] Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an
[4] National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2022年 / 96卷 / 02期
关键词：
7th member of Yanchang Formation; Ordos basin; Reservoir evolution; Reservoir forming mechanism; Tight oil;
D O I：
10.19762/j.cnki.dizhixuebao.2021242
中图分类号：
学科分类号：
摘要：
Ordos basin is the first 100 million ton tight oil bearing basin in China. The Chang 7 member of the Triassic Yanchang Formation is a typical representative of the tight oil in this basin. However, there is limited data on the tight oil accumulation mechanism in the Chang 7 member.The tight oil accumulation mechanism of the Chang 7 member is comprehensively studied in order to clarify the reservoir forming mechanism of tight oil in the Chang 7 member, through the analysis of tight reservoir characteristics and oil migration and accumulation dynamics, combined with reservoir diagenetic evolution, physical property evolution and its corresponding relationship with hydrocarbon generation evolutionand reservoir wettability analysis.The results show that high-quality source rock's hydrocarbon generation pressurization and the residual pressure of mudstone undercompaction provide power for tight oil migration. The tight oil in Chang 7 member shows two-stage filling, corresponding to the middle-late period of Late Jurassic and middle-late period of Early Cretaceous. During the first stage of tight oil filling, the reservoir has not been fully compacted, and the dissolution occurred before the large-scale filling of the second stage, which improved the physical properties of the tight reservoir. The physical properties of the reservoir in the two stages of oil and gas filling and accumulation were not as tight as they are today, and the relatively good reservoir conditions provided good migration and reservoir conditions for tight oil. The tight reservoir mainly consists of neutral and lipophilic reservoirs, which reduces the resistance to oil and gas filling. The high source reservoir pressure difference and high-temperature and high-pressure formation conditions allow low-viscosity crude oil to enter tight reservoirs and form reservoirs. This result is of great significance for the next tight oil exploration and development in the Ordos basin. © 2022, Science Press. All right reserved.
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页码：616 / 629
页数：13
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共 30 条
  • [1] Yubin Bai, Oil reservoir forming mechanisms and main controlling factors of tight oil of Chang-9 member in Ansai area, Ordos Basin, Journal of Central South University(Science and Technology), 45, 9, pp. 3127-3136, (2014)
  • [2] Beard D C, Weyl P K., Influence of texture on porosity and permeability of unconsolidatedsand, AAPG Bulletin, 57, 2, pp. 349-369, (1973)
  • [3] Shijia Chen, Junjie Lei, Liu Chun, Jingli Yao, Li Yong, Shixiang Li, Su Kaiming, Zhenglu Xiao, Factors controlling the reservoir accumulation of Triassic Chang 6 Member in Jiyuan-Wuqi area, Ordos Basin, NW China, Petroleum Exploration and Development, 46, 2, pp. 253-264, (2019)
  • [4] Deng Hucheng, Zhou Wen, Jiang Wenli, Liu Yan, Feng Liang, Genetic mechanism and development periods of fracture in Yanchang and Yan'an Formation of Western Mahuangshan Block in Ordos Basin, Journal of Jilin University(Earth Science Edition), 39, 5, pp. 811-817, (2009)
  • [5] Jinhua Fu, Yu Jian, Liming Xu, Xiaobing Niu, Feng Shengbin, Wang Xiujuan, You Yuan, Li Tao, New progress in exploration and development of tight oil in Ordos Basin and main controlling factors of large-scale enrichment and exploitable capacity, China Petroleum Exploration, 20, 5, pp. 9-19, (2015)
  • [6] Fu Siyi, Liao Zhiwei, Chen Anqing, Chen Hongde, Reservoir characteristics and multi-stage hydrocarbon accumulation of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin, NW China, Energy Exploration & Exploitation, 38, 2, pp. 348-371, (2020)
  • [7] Kai Guo, Active source rocks of Chang 7 member and hydrocarbon generation and expulsion characteristics in Longdong area, Ordos Basin, Petroleum Geology and Experiment, 39, 1, pp. 15-23, (2017)
  • [8] Xiaowen Guo, Sheng He, Lunju Zheng, Zhenzhen Wu, A quantitative model for the overpressure caused by oil generation and its influential factors, Acta Petrolei Sinica, 32, 4, pp. 637-644, (2011)
  • [9] Chengzao Jia, Caicai Zou, Li Jianzhong, Denghua Li, Min Zheng, Assessment criteria, main types, basic features and resource prospects of the tight oil in China, Acta Petrolei Sinica, 33, 3, pp. 343-350, (2012)
  • [10] Chao Li, Liquan Zhang, Xiaorong Luo, Liqiang Zhang, Caizhi Hu, Peng Yang, GuiQiang Qiu, Liyuan Ma, Yuhong Lei, A quantitative method for revising abnormally high sonic data in rich-organic rock during compaction study, Journal of China University of Petroleum(Edition of Natural Science), 40, 3, pp. 77-87, (2016)
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