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Volume 46 Issue 1
Jan.  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(1): 11-21
HONG Haitao, LU Jungang, QIN Chunyu, ZHANG Shaomin, ZHANG Rui, ZHOU Yixin, XIAO Zhenglu, ZHOU Hongfei, HAN Luyuan. Shale oil reservoir characteristics and exploration implication in Da'anzhai Member of Jurassic Ziliujing Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 11-21. doi: 10.11781/sysydz202401011
Citation: HONG Haitao, LU Jungang, QIN Chunyu, ZHANG Shaomin, ZHANG Rui, ZHOU Yixin, XIAO Zhenglu, ZHOU Hongfei, HAN Luyuan. Shale oil reservoir characteristics and exploration implication in Da'anzhai Member of Jurassic Ziliujing Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 11-21. doi: 10.11781/sysydz202401011
shu

Shale oil reservoir characteristics and exploration implication in Da'anzhai Member of Jurassic Ziliujing Formation in central Sichuan Basin

doi: 10.11781/sysydz202401011
  • 1.

    Exploration and Development Research Institute, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610051, China

  • 2.

    National Key Laboratory of Petroleum Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • 3.

    Sichuan Provincial Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • 4.

    School of Earth Science and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • Received Date: 2023-08-14
  • Rev Recd Date: 2023-12-22
  • Publish Date: 2024-01-28
    Abstract
  • To further guide the exploration and development of shale oil in the Da'anzhai Member of the Jurassic Ziliujing Formation in the Sichuan Basin, it is urgent to clarify the favorable lithofacies of shale oil. In this study, core observation, thin section authentication, high pressure mercury injection, NMR, rock pyrolysis analysis and other experiments were used to analyze the reservoir space types, pore structure characteristics and oil-bearing properties of different lithofacies of shale series in the Da'anzhai Member. The results show that mainly six types of lithofacies are developed in the Da'anzhai Member: massive (argillaceous) shell limestone, layered argillaceous shell limestone, layered shell shale, laminar shell-bearing shale, massive shell-bearing clay shale and foliated siltstone-bearing clay shale. The physical properties of shale in the Da'anzhai Member are much better than those of shell limestone, and with the increase of calcareous content, the pore size of the shale gradually increases, but the total pore volume and total connected volume gradually decrease. The average free oil value (S1) of the shale series in the Da'anzhai Member is 1.31 mg/g, with moderate oil-bearing property. The S1 values of the foliated siltstone-bearing clay shale and the laminar shell-bearing shale are relatively higher, which are 2.37 mg/g and 1.82 mg/g, respectively. In summary, it is believed that the foliated siltstone-bearing clay shale and the laminar shell-bearing shale have good reservoir properties and high oil-bearing properties. The lithofacies combination of the two can be a key exploration target for shale oil in the Da'anzhai Member.

     

    • All authors disclose no relevant conflict of interests.
    HONG Haitao and LU Jungang participated in experimental design and paper writing. XIAO Zhenglu and ZHOU Yixin participated in experimental operations and data interpretation. QIN Chunyu, ZHANG Shaomin, ZHANG Rui, ZHOU Hongfei and HAN Luyuan participated in data organization and diagram drawing. All the authors have read the last version of paper and consented for submission.
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