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Volume 46 Issue 5
Sep.  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(5): 979-988
LI Zhiming, LIU Huimin, LIU Peng, QIAN Menhui, CAO Tingting, DU Zhenjing, LI Zheng, BAO Youshu, JIANG Qigui, XU Ershe, SUN Zhongliang, LIU Yahui. Characteristics and geological significance of escaping gas rich in natural hydrogen from pilot well BYP5 cores of lower sub-member of third member of Shahejie Formation in Zhanhua Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 979-988. doi: 10.11781/sysydz202405979
Citation: LI Zhiming, LIU Huimin, LIU Peng, QIAN Menhui, CAO Tingting, DU Zhenjing, LI Zheng, BAO Youshu, JIANG Qigui, XU Ershe, SUN Zhongliang, LIU Yahui. Characteristics and geological significance of escaping gas rich in natural hydrogen from pilot well BYP5 cores of lower sub-member of third member of Shahejie Formation in Zhanhua Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 979-988. doi: 10.11781/sysydz202405979
shu

Characteristics and geological significance of escaping gas rich in natural hydrogen from pilot well BYP5 cores of lower sub-member of third member of Shahejie Formation in Zhanhua Sag, Bohai Bay Basin

doi: 10.11781/sysydz202405979
  • 1.

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

  • 2.

    State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China

  • 3.

    Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi, Jiangsu 214126, China

  • 4.

    Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257015, China

  • 5.

    Exploration and Development Research Institute, Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257015, China

  • Received Date: 2024-05-14
  • Rev Recd Date: 2024-07-06
  • Publish Date: 2024-09-28
    Abstract
  • The pilot well BYP5 is a cored well drilled to explore the oil and gas bearing properties of the highly thermally evolved lower sub-member of the third member of the Paleogene Shahejie Formation in the Bonan deep sag of the Zhanhua Sag, Bohai Bay Basin. The coring interval depth ranges from 4 267.0 to 4 338.1 m. To reveal the oil and gas bearing properties of the cored interval, pyrolysis of frozen, sealed fragments was conducted on typical samples and the escaping gas from the core was collected and quantified for composition analysis. The results show that the cored interval is a high-quality hydrocarbon source rock rich in organic matter and carbonates, with a maturity (Ro) of about 1.2%. Efficient hydrocarbon generation and expulsion likely occurred during thermal evolution, causing the current low free hydrocarbon (S1) and hydrogen index (IH) values. The content of the hydrocarbon gas from the core was generally low, ranging from 0.001 to 0.01 cm3/g, with an average of 0.005 cm3/g. Segments with relatively high levels of escaping hydrocarbon gas corresponded to those with relatively high pyrolysis S1 values. The escaping gas was mainly composed of CH4, CO2, H2, and C2H6, with mole percentages of H2 ranging from 1.08% to 19.23%, with an average of 7.09%, indicating hydrogen-rich characteristics. H2 showed a significant positive correlation with CO2 and a negative correlation with CH4. The escaping gas from the core was likely trapped in-situ, and the formation of H2 might be related to the cleavage of hetero-bonds and demethylation during the pyrolysis of organic matter. Further research is suggested on the formation mechanism, geological exploration, and evaluation of natural hydrogen released during organic matter pyrolysis, so as to provide a basis for the decision-making in the exploration and development of this type of natural hydrogen resource.

     

    • Author LI Zhiming is an Editorial Board Member and an employee of the sponsor of this journal. LIU Huimin is an Editorial Board Member of this journal. They did not take part in peer review or decision making of this article.
    LI Zhiming and LIU Huimin drafted and revised the manuscript. LIU Peng, QIAN Menhui, and CAO Tingting participated in sample analysis and data collection. DU Zhenjing, LI Zheng, BAO Youshu, and JIANG Qigui participated in drafting parts of the manuscript. XU Ershe, SUN Zhongliang, and LIU Yahui drew the diagrams. All authors have read the last version of the paper and consented to its submission.
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