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Reservoir Characteristics of Normally Pressured Shales from the Periphery of Sichuan Basin: Insights into the Pore Development Mechanism

Author

Listed:
  • Bing Feng

    (Guizhou Shale Gas Exploration and Development Co. Ltd., Zheng’an 563499, China)

  • Jiliang Yu

    (Guizhou Shale Gas Exploration and Development Co. Ltd., Zheng’an 563499, China)

  • Feng Yang

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

  • Zhiyao Zhang

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

  • Shang Xu

    (Shandong Provincial Key Laboratory of Deep Oil & Gas, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

Reservoir characteristics and the occurrence mechanism of shale gas outside of the Sichuan Basin are the research hotspots of normally pressured shales in China. Taking shales on the Anchang syncline from the periphery of the Sichuan Basin as an example, X-ray diffraction, organic geochemistry, and rock physical experiments were carried out to analyze the reservoir characteristics and their main geological controls on the normally pressured shales. The mineralogical results show that the studied shales from the Anchang syncline are mainly siliceous shales with a high quartz content (average of 57%). The quartz content of these normally pressured shales is of biological origin, as shown by the positive correlation between the quartz and organic carbon (TOC) contents. The average porosity of the studied shales is about 2.9%, which is lower than shales inside the Sichuan Basin. Organic matter pores are likely the primary storage space of the normally pressured shale gas, as shown by the positive relationship between the TOC content and porosity. However, scanning electron microscopy observations on the studied shales show that the pores in these normally pressured shales are poorly preserved; many pores have been subjected to compression and deformation due to tectonic movements. Compared to shales inside the Sichuan Basin, the effective thickness of shales outside of the Sichuan Basin is thin and the stratum dip is large. Thus, shale gas outside of the Sichuan Basin is apt to escape laterally along the bedding of the strata. After losing a significant amount of shale gas, the gas pressure decreases to normal pressure, which makes it difficult for the pores to resist compaction from the overlying strata. This is probably why most shale gas reservoirs outside of the Sichuan Basin are normally pressured, while the shale strata inside the Sichuan Basin are commonly overpressured. This study provides insights to understand the pore development and hydrocarbon occurrence on normally pressured shales outside of the Sichuan Basin.

Suggested Citation

  • Bing Feng & Jiliang Yu & Feng Yang & Zhiyao Zhang & Shang Xu, 2023. "Reservoir Characteristics of Normally Pressured Shales from the Periphery of Sichuan Basin: Insights into the Pore Development Mechanism," Energies, MDPI, vol. 16(5), pages 1-14, February.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:5:p:2166-:d:1078399
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    References listed on IDEAS

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    1. Shengxiu Wang & Jia Wang & Yuelei Zhang & Dahua Li & Weiwei Jiao & Jinxi Wang & Zhian Lei & Zhongqiang Yu & Xiaojun Zha & Xianfeng Tan, 2021. "Relationship between Organic Geochemistry and Reservoir Characteristics of the Wufeng-Longmaxi Formation Shale in Southeastern Chongqing, SW China," Energies, MDPI, vol. 14(20), pages 1-15, October.
    2. Yuying Zhang & Shu Jiang & Zhiliang He & Yuchao Li & Dianshi Xiao & Guohui Chen & Jianhua Zhao, 2021. "Coupling between Source Rock and Reservoir of Shale Gas in Wufeng-Longmaxi Formation in Sichuan Basin, South China," Energies, MDPI, vol. 14(9), pages 1-16, May.
    3. Hongming Zhan & Feifei Fang & Xizhe Li & Zhiming Hu & Jie Zhang, 2022. "Shale Reservoir Heterogeneity: A Case Study of Organic-Rich Longmaxi Shale in Southern Sichuan, China," Energies, MDPI, vol. 15(3), pages 1-14, January.
    4. Zhuo Li & Zhenxue Jiang & Hailong Yu & Zhikai Liang, 2019. "Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO 2 and N 2 Adsorption," Energies, MDPI, vol. 12(7), pages 1-15, March.
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