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Volume 46 Issue 5
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(5): 1039-1049
NIU Siqi, LIU Guangdi, WANG Yunlong, SONG Zezhang, ZHU Lianqiang, ZHAO Wenzhi, TIAN Xingwang, YANG Dailin, LI Yishu. Occurrence characteristics and genesis mechanism of pyrobitumen in Sinian Dengying to Cambrian Longwangmiao reservoirs in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 1039-1049. doi: 10.11781/sysydz2024051039
Citation: NIU Siqi, LIU Guangdi, WANG Yunlong, SONG Zezhang, ZHU Lianqiang, ZHAO Wenzhi, TIAN Xingwang, YANG Dailin, LI Yishu. Occurrence characteristics and genesis mechanism of pyrobitumen in Sinian Dengying to Cambrian Longwangmiao reservoirs in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 1039-1049. doi: 10.11781/sysydz2024051039
shu

Occurrence characteristics and genesis mechanism of pyrobitumen in Sinian Dengying to Cambrian Longwangmiao reservoirs in central Sichuan Basin

doi: 10.11781/sysydz2024051039
  • 1.

    State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China

  • 2.

    Chengdu Exploration and Development Research Institute, Daqing Oilfield Co., Ltd., Chengdu, Sichuan 610051, China

  • 3.

    PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China

  • 4.

    Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, China

  • Received Date: 2023-08-07
  • Rev Recd Date: 2024-08-22
  • Publish Date: 2024-09-28
    Abstract
  • Reservoirs in the Sinian Dengying (DY) to Lower Cambrian Longwangmiao (LWM) formations in the central Sichuan Basin exhibit evident hydrothermal activities with pyrobitumen showing signs of alterations caused by hydrothermal fluids. However, few studies have explored the relationship between hydrothermal fluid activity and the evolution of natural gas accumulation, resulting in a significant lack of understanding of oil and gas accumulation history in the DY Formation. The impact of hydrothermal fluids on oil and gas accumulation in the DY Formation is substantial, and a correct understanding of the natural gas accumulation process and the identification of favorable exploration areas in the DY Formation require further research into hydrothermal cracking gas accumulation. By examining the filling features, optical textures, and structural characteristics of pyrobitumen and conducting geochemical studies on fluid inclusions trapped by hydrothermal minerals, this study explored the genesis of pyrobitumen in the DY to LWM formations. The relationship between hydrothermal fluid activity and oil cracking was also analyzed. The the pyrobitumen in the DY to LWM formations in the central Sichuan Basin were formed during hydrothermal fluid activity, exhibiting the same optical anisotropy characteristics as the mesophase pyrobitumen. Pyrobitumen can be divided into four types: fine-grained mosaic, medium-grained mosaic, coarse-grained mosaic, and streamline types. Its formation temperature exceeded 300 ℃, far surpassing the maximum burial temperature of the strata, indicating its hydrothermal fluid-driven genesis. The hydrothermal fluid activity occurred during the Late Permian and was related to the Emeishan mantle plume. The temperature of the hydrothermal fluids exceeded 300 ℃, leading to crude oil cracking in reservoirs of the DY to LWM formations. This study found that hydrothermal fluid activity advanced the cracking time of crude oil in the paleo reservoirs of the DY to LWM formations to the Late Permian, disrupting the existing accumulation model and helping us re-understand the evolution process of gas reservoirs and identify favorable accumulation areas.

     

    • Author SONG Zezhang is a Young Editorial Board Member of this journal, and he did not take part in peer review or decision making of this article.
    The manuscript was drafted and revised by NIU Siqi. The project was managed by LIU Guangdi. The project operation and document are under the responsibility of WANG Yunlong. SONG Zezhang participated in data processing and initial draft revision. The experiment was designed and completed by ZHU Lianqiang and LI Yishu. The project was supervised by ZHAO Wenzhi. The project materials were provided by TIAN Xingwang and YANG Dailin. All authors have read the last version of the paper and consented to its submission.
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