德阳-安岳裂陷槽中段筇竹寺组沉积环境控制下的优质页岩岩相类型及分布

宁诗坦; 唐相路; 徐亮; 姜振学; 史德民; 郑继威; 钟可塑; 李彦佑

doi:10.3799/dqkx.2025.084

Volume 50 Issue 9

Sep. 2025

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Article Navigation > Earth Science > 2025 > 50(9): 3631-3650

Ning Shitan, Tang Xianglu, Xu Liang, Jiang Zhenxue, Shi Deming, Zheng Jiwei, Zhong Kesu, Li Yanyou, 2025. Lithofacies Types and Distribution of High-Quality Shale Driven by Sedimentary Environments: A Case Study of the Qiongzhusi Formation Shale. Earth Science, 50(9): 3631-3650. doi: 10.3799/dqkx.2025.084

Citation:

Ning Shitan, Tang Xianglu, Xu Liang, Jiang Zhenxue, Shi Deming, Zheng Jiwei, Zhong Kesu, Li Yanyou, 2025. Lithofacies Types and Distribution of High-Quality Shale Driven by Sedimentary Environments: A Case Study of the Qiongzhusi Formation Shale. Earth Science, 50(9): 3631-3650. doi: 10.3799/dqkx.2025.084

Citation:

Ning Shitan, Tang Xianglu, Xu Liang, Jiang Zhenxue, Shi Deming, Zheng Jiwei, Zhong Kesu, Li Yanyou, 2025. Lithofacies Types and Distribution of High-Quality Shale Driven by Sedimentary Environments: A Case Study of the Qiongzhusi Formation Shale. Earth Science, 50(9): 3631-3650. doi: 10.3799/dqkx.2025.084

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Lithofacies Types and Distribution of High-Quality Shale Driven by Sedimentary Environments: A Case Study of the Qiongzhusi Formation Shale

doi: 10.3799/dqkx.2025.084

1.
National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
2.
Xinjiang Key Laboratory of Intelligent Exploration and Development of Oil and Gas, China University of Petroleum (Beijing), Karamay 834000, China
3.
Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Sichuan Provincial Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610051, China

Received Date: 2025-03-26
Publish Date: 2025-09-25

Abstract

Abstract

The sedimentation of the Qiongzhusi Formation shale in the Sichuan Basin is controlled by the tectonic-sedimentary differentiation of the Deyang-Anyue Rift Trough. Its lithofacies types and distribution are closely related to sedimentary environments. Based on previous studies of the Qiongzhusi Formation, this research comprehensively uses core observation, thin-section identification, and geochemical testing and analysis to classify the lithofacies types of the Qiongzhusi Formation shale in the middle segment of the rift trough, and discusses the high quality shale lithofacies types and their distribution controlled by sedimentary environments. The results show that: (1) The sedimentary environment within the rift depression exhibits distinct differentiation characteristics. The central part of the depression is dominated by biogenic high-silica deposits, forming a strong reducing environment with a dual-threshold boundary, where ancient productivity and water retention reach their peak; the trough margin is dominated by terrigenous clastic input. Horizontally, it shows a gradational pattern of "oxidizing margin-anoxic trough, " while vertically, it exhibits a cyclic evolution of " anoxic at the bottom-dysoxic in the middle-oxidizing at the top." (2) "TOC-mineral-grain size" coupling lithofacies classification system is established, with 36 lithofacies types divided. It is clarified that 16 lithofacies types develop in the middle segment of the rift trough, such as organic-rich felsic shale (H-F-S) and organic-rich mixed silty shale (H-M-SS), systematically revealing the heterogeneity characteristics of shale and providing new ideas for predicting deep shale gas sweet spots. (3) The high-quality lithofacies are mainly organic-rich felsic shale (H-F-S), organic-rich mixed shale (H-M-S), organic-rich felsic silty shale (H-F-SS), organic-rich argillaceous silty shale (H-A-SS), and organic-rich mixed silty shale (H-M-SS), which are concentrated in the deep-water shelf facies of the 1st, 3rd, 5th, and 7th sub-layers of the Qiongzhusi Formation. The deep-water dysoxic-anoxic environments promote organic matter enrichment and preservation, and high felsic mineral content provides high-quality reservoir spaces. The research results provide key geological bases for the evaluation and development of deep shale gas resources in the Sichuan Basin.
- Sichuan basin,
- Deyang-Anyue rift trough,
- lithofacies type,
- sedimentary environment,
- organic matter enrichment,
- shale gas,
- petroleum geology

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References(81)

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通讯作者: 陈斌, bchen63@163.com

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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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Lithofacies Types and Distribution of High-Quality Shale Driven by Sedimentary Environments: A Case Study of the Qiongzhusi Formation Shale

doi: 10.3799/dqkx.2025.084

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