川南龙马溪组深层页岩气地质特征、甜点评价问题与技术对策

傅国友; 邹才能; 王贵文; 赵群; 武瑾; 施振生; 刘钰洋; 周天琪

doi:10.3799/dqkx.2026.090

Volume 51 Issue 5

May 2026

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Article Navigation > Earth Science > 2026 > 51(5): 1849-1860

Fu Guoyou, Zou Caineng, Wang Guiwen, Zhao Qun, Wu Jin, Shi Zhensheng, Liu Yuyang, Zhou Tianqi, 2026. Geological Characteristics, Sweet Spot Evaluation Issues and Technical Countermeasures of Deep Longmaxi Formation Shale Gas in South Sichuan Basin. Earth Science, 51(5): 1849-1860. doi: 10.3799/dqkx.2026.090

Citation:

Fu Guoyou, Zou Caineng, Wang Guiwen, Zhao Qun, Wu Jin, Shi Zhensheng, Liu Yuyang, Zhou Tianqi, 2026. Geological Characteristics, Sweet Spot Evaluation Issues and Technical Countermeasures of Deep Longmaxi Formation Shale Gas in South Sichuan Basin. Earth Science, 51(5): 1849-1860. doi: 10.3799/dqkx.2026.090

Citation:

Fu Guoyou, Zou Caineng, Wang Guiwen, Zhao Qun, Wu Jin, Shi Zhensheng, Liu Yuyang, Zhou Tianqi, 2026. Geological Characteristics, Sweet Spot Evaluation Issues and Technical Countermeasures of Deep Longmaxi Formation Shale Gas in South Sichuan Basin. Earth Science, 51(5): 1849-1860. doi: 10.3799/dqkx.2026.090

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Geological Characteristics, Sweet Spot Evaluation Issues and Technical Countermeasures of Deep Longmaxi Formation Shale Gas in South Sichuan Basin

doi: 10.3799/dqkx.2026.090

Fu Guoyou^{1, 2
,
,},
Zou Caineng^{1, 3},
Wang Guiwen¹,
Zhao Qun^{3, 4},
Wu Jin^{3, 4},
Shi Zhensheng^{3, 4},
Liu Yuyang^{3, 4},
Zhou Tianqi^{3, 4}

1.
China University of Petroleum (Beijing), Beijing 102249, China
2.
Science and Technology Management Department, PetroChina, Beijing 100007, China
3.
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
4.
National Energy Shale Gas R & D (Experiment) Center, Langfang 065007, China

Received Date: 2025-03-01
Publish Date: 2026-05-25

Abstract

Abstract

To address the frequent engineering problems and lower-than-expected construction and production in the development of deep shale gas in the Longmaxi Formation of South Sichuan, this study explores technical countermeasures for deep shale gas sweet spot evaluation through analysis of geological characteristics, sorting out development challenges and discussing their genesis.Results show that deep shale gas reservoirs (buried depth>3 500 m) of the Longmaxi Formation in South Sichuan are characterized by complex sedimentary facies changes, well-developed faults, fractures and micro-amplitude structures, high and complex in-situ stress, high temperature and high fluid pressure, and local low resistivity.The reservoir heterogeneity and engineering complexity are much higher than those of mid-deep layers. Deep sweet spots optimized by existing shale gas sweet spot evaluation technologies have encountered problems in development, including poor local resource quality, horizontal well casing deformation rate as high as 53%, widespread inter-well fracturing communication, and unsatisfied single-well productivity and economic benefits.The core reason is that the current evaluation system insufficiently considers the unique geological-engineering coupling problems of deep reservoirs, such as large in-situ stress difference, well-developed natural fractures, and low-resistivity resource risks. Accordingly, in this paper it proposes to establish a high-precision "transparent geological body" for shale gas sweet spots through geology-engineering integration, build a dynamic sweet spot risk evaluation system centered on "artificial gas reservoirs", and adopt a development mode of two-step well pattern deployment to release in-situ stress step by step. The shale reservoirs are finely characterized by multiple factors of resources and engineering, and the risks of sweet spot development are dynamically and quantitatively evaluated. Meanwhile, the two-step well pattern development mode is adopted to release in-situ stress gradually to solve casing deformation.The research results can provide technical references for sweet spot evaluation and development risk prevention and control of deep shale gas in South Sichuan and other similar areas.
- shale gas,
- sweet spot evaluation,
- in-situ stress,
- low-resistivity gas reservoir,
- fracturing stimulation,
- geology-engineering integration,
- engineering geology

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References(46)

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Geological Characteristics, Sweet Spot Evaluation Issues and Technical Countermeasures of Deep Longmaxi Formation Shale Gas in South Sichuan Basin

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