四川盆地泸州地区海相页岩天然裂缝特征及主控因素

马诗杰; 曾联波; 石学文; 吴伟; 田鹤; 薛萌; 罗良

doi:10.3799/dqkx.2022.226

Volume 48 Issue 7

Jul. 2023

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Article Navigation > Earth Science > 2023 > 48(7): 2630-2642

Ma Shijie, Zeng Lianbo, Shi Xuewen, Wu Wei, Tian He, Xue Meng, Luo Liang, 2023. Characteristics and Main Controlling Factors of Natural Fractures in Marine Shale in Luzhou Area, Sichuan Basin. Earth Science, 48(7): 2630-2642. doi: 10.3799/dqkx.2022.226

Citation:

Ma Shijie, Zeng Lianbo, Shi Xuewen, Wu Wei, Tian He, Xue Meng, Luo Liang, 2023. Characteristics and Main Controlling Factors of Natural Fractures in Marine Shale in Luzhou Area, Sichuan Basin. Earth Science, 48(7): 2630-2642. doi: 10.3799/dqkx.2022.226

Citation:

Ma Shijie, Zeng Lianbo, Shi Xuewen, Wu Wei, Tian He, Xue Meng, Luo Liang, 2023. Characteristics and Main Controlling Factors of Natural Fractures in Marine Shale in Luzhou Area, Sichuan Basin. Earth Science, 48(7): 2630-2642. doi: 10.3799/dqkx.2022.226

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Characteristics and Main Controlling Factors of Natural Fractures in Marine Shale in Luzhou Area, Sichuan Basin

doi: 10.3799/dqkx.2022.226

Ma Shijie^{1, 2
,
,},
Zeng Lianbo^{1, 2
,
,
,},
Shi Xuewen³,
Wu Wei³,
Tian He^{1, 2},
Xue Meng^{1, 2},
Luo Liang^{1, 2}

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
2.
College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
3.
Shale Gas Research Institute of PetroChina Southwest Oil and Gas Field Company, Chengdu 610091, China

Received Date: 2021-12-25
Publish Date: 2023-07-25

Abstract

Abstract

The characteristics of natural fractures are important geological indicators in evaluating the law of shale gas enrichment and preservation. The research object is the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation shale in the Luzhou area of southern Sichuan Basin. The characteristics and controlling factors of different types of natural fractures in the study area were studied by using seismic, logging, core, thin sections, scanning electron microscopy, and analytical laboratory data. The research results show that the Wufeng-Longmaxi shale fractures in the Luzhou area can be divided into three types: structural fractures, diagenetic fractures and abnormally high pressure fractures according to their geological origin. According to the mechanical properties of the fracture and the relationship with the rock mechanics layer, structural fractures are dominated by transformational shear fractures, intraformational open fractures, and bed-parallel shear fractures. Diagenetic fractures include lamellation fractures and shrinkage fractures. In the Luzhou area, a large number of structural fractures and bedding fractures are developed, while shrinkage fractures and abnormally high pressure fractures are relatively low. The distribution and development of structural fractures are controlled by faults, folds, rock mechanics layer and brittleness, and the development of lamellation fractures is mainly controlled by brittleness, organic matter content and lamina types.
- natural fracture,
- genetic type,
- development characteristic,
- main controlling factor,
- Wufeng Formation-Longmaxi Formation,
- Sichuan Basin,
- petroleum geology

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References(66)

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Characteristics and Main Controlling Factors of Natural Fractures in Marine Shale in Luzhou Area, Sichuan Basin

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