鄂尔多斯盆地西部志丹-吴起地区延长组裂缝特征及其控藏作用

尹帅; 丁文龙; 林利飞; 刘翰林; 李爱荣

doi:10.3799/dqkx.2022.217

Volume 48 Issue 7

Jul. 2023

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Article Navigation > Earth Science > 2023 > 48(7): 2614-2629

Yin Shuai, Ding Wenlong, Lin Lifei, Liu Hanlin, Li Airong, 2023. Characteristics and Controlling Effect on Hydrocarbon Accumulation of Fractures in Yanchang Formation in Zhidan-Wuqi Area, Western Ordos Basin. Earth Science, 48(7): 2614-2629. doi: 10.3799/dqkx.2022.217

Citation:

Yin Shuai, Ding Wenlong, Lin Lifei, Liu Hanlin, Li Airong, 2023. Characteristics and Controlling Effect on Hydrocarbon Accumulation of Fractures in Yanchang Formation in Zhidan-Wuqi Area, Western Ordos Basin. Earth Science, 48(7): 2614-2629. doi: 10.3799/dqkx.2022.217

Citation:

Yin Shuai, Ding Wenlong, Lin Lifei, Liu Hanlin, Li Airong, 2023. Characteristics and Controlling Effect on Hydrocarbon Accumulation of Fractures in Yanchang Formation in Zhidan-Wuqi Area, Western Ordos Basin. Earth Science, 48(7): 2614-2629. doi: 10.3799/dqkx.2022.217

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Characteristics and Controlling Effect on Hydrocarbon Accumulation of Fractures in Yanchang Formation in Zhidan-Wuqi Area, Western Ordos Basin

doi: 10.3799/dqkx.2022.217

Yin Shuai^{1, 2
,
,},
Ding Wenlong^{3, 4
,
,},
Lin Lifei⁵,
Liu Hanlin⁶,
Li Airong^{1, 2}

1.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China
2.
Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China
3.
School of Energy Resources, China University of Geosciences, Beijing 100083, China
4.
Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development, China University of Geosciences, Beijing 100083, China
5.
Yanchang Oilfield Co. Ltd., Yan'an 716000, China
6.
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received Date: 2021-09-02
Publish Date: 2023-07-25

Abstract

Abstract

A large number of fractures are developed in the Yanchang Formation in the western Ordos Basin, and the existence of fractures has a good indication of tight oil sweet spots. In this paper, taking the tight oil reservoirs of the Yanchang Formation in the Zhidan-Wuqi region of the Ordos Basin as an example, a large amount of core, thin section, logging, paleomagnetism, productivity data and numerical simulation methods are used to systematically study the development characteristics and control of tight oil fractures in the study area. The research results show that the Yanchang Formation mainly develops vertical fractures, and the classification standard for the degree of fracture development is established according to the thickness of the fractures. Combining the coupling relationship between fractures and sand bodies, structures, and reservoirs and the current status of reservoir production, the fracture-controlling action for oil is clarified. It is believed that the regional fractures provide a good drainage system for the Yanchang Formation tight oil reservoirs; the river convergence or diversion areas are repeatedly washed by river water, the sandstone is well sorted, brittle, and the fractures are well developed and are conducive to hydrocarbon accumulation; the low-amplitude structural high points and nose-like uplift areas have developed fractures and are conducive to hydrocarbon accumulation; the relationship between the fracture zone and the strike of the sand body is coupled to form a "parallel drainage" fracture sweet spot; the fractures are mainly developed in the medium and low thickness fine sandstone, and the cumulative thickness of the sand body is mainly distributed in the range of 5-15 m; from the point of view of the location of the sand body, the fractures are mainly developed in the wings of the main channel, which is related to the reduction of the particle size, compaction space and thickness of the sand bodies in the wings.
- low-amplitude structure,
- fracture,
- sedimentation,
- structure,
- sweet spot,
- tight oil,
- petroleum geology

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References(78)

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沈阳化工大学材料科学与工程学院沈阳 110142

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Characteristics and Controlling Effect on Hydrocarbon Accumulation of Fractures in Yanchang Formation in Zhidan-Wuqi Area, Western Ordos Basin

doi: 10.3799/dqkx.2022.217

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