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Characteristics of Mineralogy, Lithofacies of Fine-Grained Sediments and Their Relationship with Sedimentary Environment: Example from the Upper Permian Longtan Formation in the Sichuan Basin

Author

Listed:
  • Hongzhi Yang

    (PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China)

  • Liangbiao Lin

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China)

  • Liqing Chen

    (PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China)

  • Yu Yu

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China)

  • Du Li

    (PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China)

  • Jingchun Tian

    (Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China)

  • Wen Zhou

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
    College of Energy, Chengdu University of Technology, Chengdu 610059, China)

  • Jianhua He

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
    College of Energy, Chengdu University of Technology, Chengdu 610059, China)

Abstract

The Longtan Formation of the Upper Permian in the Sichuan Basin has become a significant target for shale gas exploration in recent years. Multiple methods, including outcrop observations, thin sections, total organic matter content, X-ray diffraction and scanning electron microscopy were used to investigate the mineralogy, shale lithofacies assemblages and their relationships with the deposition environment. The mineral composition of the Longtan Formation has strong mineral heterogeneity. The TOC values of the Longtan Formation have a wide distribution range from 0.07% to 74.67% with an average value of 5.73%. Four types of shale lithofacies assemblages of the Longtan Formation could be distinguished, as clayey mudstone (CLS), carbonaceous shale (CAS), siliceous shale (SS) and mixed shale (MS) on the basis of mineral compositions. The TOC values of various types of shale lithofacies assemblages in the Longtan Formation varied widely. The shore swamp of the Longtan Formation is most influenced by the terrestrial input and mainly develops CLS and MS. The tidal flat is influenced by the terrestrial input and can also deposit carbonate minerals, developing CLS, CAS and MS. The shallow water melanged accumulation shelf develops CAS and MS, dominated by clay and carbonate minerals. The deep water miscible shelf develops CLS and SS, whose mineral composition is similar to that of the shore swamp, but the quartz minerals are mainly formed by chemical and biological reactions, which are related to the Permian global chert event. The depositional environment of the Longtan Formation controls the shale mineral assemblage of the Longtan Formation and also influences the TOC content.

Suggested Citation

  • Hongzhi Yang & Liangbiao Lin & Liqing Chen & Yu Yu & Du Li & Jingchun Tian & Wen Zhou & Jianhua He, 2021. "Characteristics of Mineralogy, Lithofacies of Fine-Grained Sediments and Their Relationship with Sedimentary Environment: Example from the Upper Permian Longtan Formation in the Sichuan Basin," Energies, MDPI, vol. 14(12), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3662-:d:578139
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    References listed on IDEAS

    as
    1. Jianhua He & Hucheng Deng & Ruolong Ma & Ruyue Wang & Yuanyuan Wang & Ang Li, 2020. "Reservoir Characteristics of the Lower Jurassic Lacustrine Shale in the Eastern Sichuan Basin and Its Effect on Gas Properties: An Integrated Approach," Energies, MDPI, vol. 13(17), pages 1-16, August.
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    Cited by:

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    2. Haishui Han & Xinglong Chen & Zemin Ji & Junshi Li & Weifeng Lv & Qun Zhang & Ming Gao & Hao Kang, 2022. "Experimental Characterization of Oil/Gas Interface Self-Adjustment in CO 2 -Assisted Gravity Drainage for Reverse Rhythm Reservoir," Energies, MDPI, vol. 15(16), pages 1-16, August.

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