鄂尔多斯盆地陇东地区长9油层组砂体成因与油气差异分布

李程善; 张文选; 雷宇; 张海峰; 黄易; 张自力; 孙明亮

doi:10.3799/dqkx.2021.007

Volume 46 Issue 10

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(10): 3560-3574

Li Chengshan, Zhang Wenxuan, Lei Yu, Zhang Haifeng, Huang Yi, Zhang Zili, Sun Mingliang, 2021. Characteristics and Controlling Factors of Oil Accumulation in Chang 9 Member in Longdong Area, Ordos Basin. Earth Science, 46(10): 3560-3574. doi: 10.3799/dqkx.2021.007

Citation:

Li Chengshan, Zhang Wenxuan, Lei Yu, Zhang Haifeng, Huang Yi, Zhang Zili, Sun Mingliang, 2021. Characteristics and Controlling Factors of Oil Accumulation in Chang 9 Member in Longdong Area, Ordos Basin. Earth Science, 46(10): 3560-3574. doi: 10.3799/dqkx.2021.007

Citation:

Li Chengshan, Zhang Wenxuan, Lei Yu, Zhang Haifeng, Huang Yi, Zhang Zili, Sun Mingliang, 2021. Characteristics and Controlling Factors of Oil Accumulation in Chang 9 Member in Longdong Area, Ordos Basin. Earth Science, 46(10): 3560-3574. doi: 10.3799/dqkx.2021.007

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Characteristics and Controlling Factors of Oil Accumulation in Chang 9 Member in Longdong Area, Ordos Basin

doi: 10.3799/dqkx.2021.007

1.
Exploration Department, PetroChina Changqing Oilfield Company, Xi'an 710000, China
2.
BGP Inc., China National Petroleum Corporation, Zhuozhou 072750, China
3.
Petroleum Engineering Discipline of PetroChina Xinjiang Training Center (Xinjiang Institute of Technicians), Karamay 834000, China
4.
College of Geosciences, China University of Petroleum, Beijing 102249, China

Received Date: 2020-12-01
Available Online: 2021-11-03
Publish Date: 2021-11-03

Abstract

Abstract

The exploration practice shows that the Yanchang Formation in Ordos basin is rich in oil and gas resources, but there are obvious differences in oil and gas accumulation in different or the same member. Based on a large number of core and drilling/logging data, in this paper it systematically analyzes the lithology and rock association, sedimentary facies and oil accumulation characteristics of the Triassic Yanchang Formation in Longdong area, Ordos basin. The results show that Chang 9 Member in Longdong area was formed under the background of rapid expansion of Ordos basin and gradual deepening of water. River controlled delta deposits and lake (gravity flow) deposits mainly developed in southwest direction. Among them, underwater distributary channel, mouth bar and basin floor fan of delta front are the main reservoir sandstone genetic types of Chang 9 member. Influenced by the changes of water depth and hydrodynamic intensity, the distributary rivers in the delta front are cut and overlapped with each other, and the sandbodies along the dispersion direction of main provenance have the characteristics of "strip", "belt", "blanket" and then "sheet". There are two types of oil reservoirs, i.e. "self generation and self storage" type and "upper generation and lower reservoir" type. It is common to form "upper generation and lower reservoir" type oil reservoirs of type Ⅰ crude oil with Chang 7 black shale as oil source. The reservoirs are mainly composed of underwater distributary channel and channel-bar sandstone, mostly lithologic and structural lithologic reservoirs, which are continuously distributed along the delta formed by each main source direction. However, the formation of "self generation and self storage" type oil reservoirs, mainly composed of type Ⅱ crude oil, is closely related to the basin floor fan sandbodies produced by the interbedding of Chang 9 source rocks, and are distributed in the semi deep lake area near the Chang 9 member along the Zhidan-Huachi-Huaishuzhuang. In addition, the oil in the reservoir is mainly concentrated in the parts with relatively good properties such as underwater distributary channel and mouth bar. This study considers that the spatial configuration of "source reservoir", physical properties of reservoir and spatial connectivity of sand body are the main controlling factors of oil differential migration and accumulation in Chang 9 member.
- sandbody association,
- petroleum differential distribution,
- Yanchang Formation,
- Chang 9 Member,
- Longdong area,
- Ordos basin,
- hydrocarbon

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References(50)

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Characteristics and Controlling Factors of Oil Accumulation in Chang 9 Member in Longdong Area, Ordos Basin

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