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Volume 46 Issue 5
Sep.  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(5): 954-964
ZHI Dongming, LENG Junying, XIE An, TANG Yong, HE Jinyi, HE Wenjun, LI Zhiming, ZOU Yang, ZHU Tao. Characteristics and occurrence states of shale biomarker compounds in Fengcheng Formation, Mahu Sag, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 954-964. doi: 10.11781/sysydz202405954
Citation: ZHI Dongming, LENG Junying, XIE An, TANG Yong, HE Jinyi, HE Wenjun, LI Zhiming, ZOU Yang, ZHU Tao. Characteristics and occurrence states of shale biomarker compounds in Fengcheng Formation, Mahu Sag, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 954-964. doi: 10.11781/sysydz202405954
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Characteristics and occurrence states of shale biomarker compounds in Fengcheng Formation, Mahu Sag, Junggar Basin

doi: 10.11781/sysydz202405954
  • 1.

    Xinjiang Research Institute of Huairou Laboratory, Urumqi, Xinjiang 830000, China

  • 2.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • 3.

    Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

  • Received Date: 2024-04-19
  • Rev Recd Date: 2024-08-07
  • Publish Date: 2024-09-28
    Abstract
  • The characteristics of biomarker compounds and their occurrence states in different layers of the Permian Fengcheng Formation shale in Mahu Sag, Junggar Basin are poorly understood. By using experimental techniques such as rock pyrolysis, gas chromatography-mass spectrometry, fluorescence thin sections, and argon ion polishing electron microscopy, the material basis of hydrocarbon source rocks in different intervals, the distribution characteristics and significance of biomarker compounds, and different occurrence states of shale oil are clarified. This is of great significance for the next step in exploration and deployment in the Mahu Sag. The shale of the Fengcheng Formation in the Mahu Sag is mainly medium to good hydrocarbon source rocks, with type Ⅱ organic matter and in a mature evolutionary stage. The composition characteristics of biomarker compounds show high abundance of Pr and Ph, β-carotane, and C29 rearranged steranes. The C27-C28-C29 regular steranes exhibit an inverted "L" distribution, indicating that the organic matter is mainly contributed by lower aquatic organisms such as algae. Lower Pr/Ph ratios and higher gammacerane indices reflect a saline reducing sedimentary environment. Maturity parameters such as C31αβ22S/(22S+22R), C29M/C29H, and C29ββ/(ββ+αα) for hopanes and steranes indicate that the hydrocarbon source rocks are in the mature stage. In addition, the shale of the second member of the Fengcheng Formation has greater hydrocarbon generation potential and better source rock material basis than that in the first and third members. Meanwhile, biomarker compound parameters such as C20/C23TT, C21/C23TT, and Ga/C30H indicate that the second member has more contributions from algae and other organisms, and a more reducing and saline environment. The hydrocarbons in the second member are mainly in a free occurrence state, residing in intergranular and intragranular pores. The study shows that the second member of the Fengcheng Formation is more favorable for shale oil enrichment and preservation, showing a better prospect for shale oil exploration and development.

     

    • Author Ll Zhiming is an Editorial Board Member and an employee of the sponsor of this journal. LENG Junying and HE Jinyi are employees of the sponsor of this journal. They did not take part in peer review or decision making of this article.
    ZHI Dongming was responsible for the overall planning, structural design, and implementation of the paper. LENG Yunying was responsible for writing the paper. XIE An was responsible for the literature review. TANG Yong was responsible for the experimental design and comprehensive analysis of experimental results. HE Jinyi was responsible for data collection and analysis. HE Wenjun was responsible for technical support and selection of experimental methods. LI Zhiming was responsible for conducting experiments and analyzing the resulting data. ZOU Yang assisted with figure preparation. ZHU Tao was responsible for revising the paper. All authors have read the last version of the paper and consented to its submission.
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