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Volume 47 Issue 2
Mar.  2025
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2025  >  47(2): 433-440
ZHANG Jinqing, TAO Guoliang, HUANG Dai, LUO Cuijuan, LIU Lingbo, YANG Yunfeng. Issues in shale oil core porosity measurement[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(2): 433-440. doi: 10.11781/sysydz2025020433
Citation: ZHANG Jinqing, TAO Guoliang, HUANG Dai, LUO Cuijuan, LIU Lingbo, YANG Yunfeng. Issues in shale oil core porosity measurement[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(2): 433-440. doi: 10.11781/sysydz2025020433
shu

Issues in shale oil core porosity measurement

doi: 10.11781/sysydz2025020433
  • 1.

    Institutional Center for Shared Technologies and Facilities, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

  • 2.

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

  • 3.

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

  • 4.

    Shengli Geologging Company, SINOPEC Jingwei Co., Ltd., Dongying, Shandong 257000, China

  • 5.

    Suzhou Grand Energy Technology Ltd., Suzhou, Jiangsu 215163, China

  • 6.

    Suzhou Zhongke Dixing Innovation Technology Research Institute, Suzhou, Jiangsu 215163, China

  • Received Date: 2024-02-19
  • Rev Recd Date: 2025-02-06
  • Publish Date: 2025-03-28
    Abstract
  • The primary methods for shale porosity measurement are the fluid invasion method and the electron/X-ray radiation methods. Among them, radiation methods, due to certain limitations, are currently not widely applied. Since shale pore structures have nanometer-scale characteristics, helium gas, with its small molecular size, stable chemical properties, and excellent permeability, has become the most commonly used fluid medium for shale porosity measurement. The penetration of helium gas into shale is influenced by core sample size and pore connectivity. Bulk samples require a long time for pressure equilibrium due to their complex pore tortuosity, while grain samples exhibit improved nanopore connectivity in shale with more pore space detected, making the measurement more accurate and reliable. This study aims to determine the sample with the optimal particle size and explore the impact of solvent extraction on porosity under the complex interaction mechanisms of soluble organic matter, organic solvent, and nanopores in shale oil cores. Recent progress in shale porosity measurement is systematically reviewed, focusing on sample size and solvent extraction, and experimental analyses of the shale oil core porosity in the Cretaceous Qingshankou Formation in Songliao Basin are conducted. The research indicates that the combination of bulk sample apparent density with grain helium porosity achieves the best measurement result for shale oil core porosity. It is recommended to use samples with particle sizes that cover 3 to 4 orders of magnitude larger than the main pore diameter to ensure both sample representativeness and experimental efficiency. It isn't recommended to perform solvent extraction on shale oil cores and use low-temperature vacuum drying to remove soluble organic matter in pores, thereby improving the accuracy of porosity measurements.

     

    • The author, TAO Guoliang, is an employee of the sponsor of this journal, a member of the editorial board, and a member of the editorial team. He did not participate in the peer review, editorial process, or decision-making related to this article.
    ZHANG Jinqing, TAO Guoliang, and YANG Yunfeng conceptualized the study and designed the experiments. The experimental operation and data processing were completed by LUO Cuijuan and LIU Lingbo. The manuscript was drafted and revised by ZHANG Jinqing, HUANG Dai, and YANG Yunfeng. All authors have read the final version of the paper and consented to its submission.
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