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Genesis of Bedding Fractures in Ordovician to Silurian Marine Shale in Sichuan Basin

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  • Hu Wang

    (Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
    School of Earth Resources, China University of Geosciences, Wuhan 430074, China)

  • Zhiliang He

    (China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    Sinopec Petroleum Exploration and Development Research Institute, Beijing 100083, China)

  • Shu Jiang

    (Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
    School of Earth Resources, China University of Geosciences, Wuhan 430074, China)

  • Yonggui Zhang

    (China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    Sinopec Petroleum Exploration and Development Research Institute, Beijing 100083, China)

  • Haikuan Nie

    (China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    Sinopec Petroleum Exploration and Development Research Institute, Beijing 100083, China)

  • Hanyong Bao

    (Exploration and Development Research Institute, SINOPEC Jianghan Oilfield Company, Wuhan 430073, China)

  • Yuanping Li

    (Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
    School of Earth Resources, China University of Geosciences, Wuhan 430074, China)

Abstract

The effective utilization of shale bedding fractures is of great significance to improve shale gas recovery efficiency. Taking the Wufeng–Longmaxi Formation shale in Sichuan Basin as the research object, the formation process and mechanism of bedding fractures in marine shale are discussed, based on field observation and description, high-resolution electron microscope scanning, fluid inclusion detection, and structural subsidence history analysis. The results show that the formation of bedding fractures is jointly controlled by sedimentary characteristics, hydrocarbon generation, and tectonic movement: the development degree of bedding (fractures) is controlled by the content of shale organic matter and brittle minerals, and bedding fractures formed in the layers with high organic matter; tectonic movement created stress environment and space for bedding fractures and promoted the opening of bedding fractures; the time for calcite vein to capture fluid is consistent with the time of oil-gas secondary pyrolysis stage. The formation of the calcite vein is accompanied by the opening of fractures. The acid and oil-gas generated in the hydrocarbon generation process occupied the opening space and maintained the bedding fractures open. The study of the formation process of bedding fractures is helpful to select a suitable method to identify bedding fractures, and then effectively use it to form complex fracture networks in the fracturing process to improve shale oil and gas recovery.

Suggested Citation

  • Hu Wang & Zhiliang He & Shu Jiang & Yonggui Zhang & Haikuan Nie & Hanyong Bao & Yuanping Li, 2022. "Genesis of Bedding Fractures in Ordovician to Silurian Marine Shale in Sichuan Basin," Energies, MDPI, vol. 15(20), pages 1-14, October.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7738-:d:947363
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    References listed on IDEAS

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    1. Zhu, Hongjian & Ju, Yiwen & Yang, Manping & Huang, Cheng & Feng, Hongye & Qiao, Peng & Ma, Chao & Su, Xin & Lu, Yanjun & Shi, Erxiu & Han, Jinxuan, 2022. "Grain-scale petrographic evidence for distinguishing detrital and authigenic quartz in shale: How much of a role do they play for reservoir property and mechanical characteristic?," Energy, Elsevier, vol. 239(PC).
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