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Volume 46 Issue 2
Mar.  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(2): 228-237
LI Chao, LUO Tao, HUANG Yahao, LIU Yicheng, CHEN Junlin, WANG Chuan. Fluid evolution of fracture veins of Paleogene Funing Formation in well HY1 in Subei Basin and implications for shale oil filling[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(2): 228-237. doi: 10.11781/sysydz202402228
Citation: LI Chao, LUO Tao, HUANG Yahao, LIU Yicheng, CHEN Junlin, WANG Chuan. Fluid evolution of fracture veins of Paleogene Funing Formation in well HY1 in Subei Basin and implications for shale oil filling[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(2): 228-237. doi: 10.11781/sysydz202402228
shu

Fluid evolution of fracture veins of Paleogene Funing Formation in well HY1 in Subei Basin and implications for shale oil filling

doi: 10.11781/sysydz202402228
  • 1.

    SINOPEC East China Petroleum Engineering Co., Ltd., Nanjing, Jiangsu 211400, China

  • 2.

    College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China

  • 3.

    School of Earth Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China

  • Received Date: 2023-06-24
  • Rev Recd Date: 2024-01-03
  • Publish Date: 2024-03-28
    Abstract
  • A significant breakthrough has been made in the exploration and development of shale oil in the Subei Basin. Cores from well HY1 in the Gaoyou Sag of Subei Basin indicate the presence of well-developed natural fractures within the organic-rich shale of the second member of Paleogene Funing Formation. These fractures contain compelling evidence of shale oil, gas, and fluid activities and migration. This study specifically examines the calcite veins filling the shale fractures within the second member of Funing Formation. Through the integration of methodologies from mineralogy, elemental geochemistry, geochronology, and geological fluid analysis, the originof paleo fluids, the timing of vein formation, and fluid inclusions within the shale fracture veins are investigated. This study also sheds light on paleotemperature conditions and corresponding geological timeframes during the burial, uplift, and denudation of the shale oil-bearing layers. The primary fracture types observed in the second member of Funing Formation include bedding fractures, detachment fractures, shear fractures, shrinkage fractures, and tensile fractures, predominantly filled with fibrous calcite veins indicating a source linked to hydrothermal fluids in a reducing environment. Notably, three distinct stages of shale oil injection are evident within the organic-rich shale fracture veins of the second member of Funing Formation, marked by primary green fluorescent oil inclusions from the Middle Eocene, secondary blue fluorescent oil inclusions from the Late Eocene, and secondary green fluorescent oil inclusions from the Late Quaternary period. The primary accumulation of shale oil occurred during the period of maximum burial depth, emphasizing the significant role of tectonic movements, especially the Sanduo tectonic event, in the redistribution and migration of shale oil in the region.

     

    • All authors disclose no relevant conflict of interests.
    LI Chao was responsible for the preparation and revision of the paper. HUANG Yahao was responsible for experimental design. LUO Tao was responsible for the tracing of vein source and the analysis of fluid inclusions. LIU Yicheng was responsible for the analysis of shale oil enrichment time and preservation conditions. CHEN Junlin was responsible for picture drawing. WANG Chuan was responsible for manuscript proofreading. All the authors have read the last version of paper and consented for submission.
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