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页岩油岩心孔隙度测量的若干问题

张金晴 陶国亮 黄代 罗翠娟 刘凌波 仰云峰

张金晴, 陶国亮, 黄代, 罗翠娟, 刘凌波, 仰云峰. 页岩油岩心孔隙度测量的若干问题[J]. 石油实验地质, 2025, 47(2): 433-440. doi: 10.11781/sysydz2025020433
引用本文: 张金晴, 陶国亮, 黄代, 罗翠娟, 刘凌波, 仰云峰. 页岩油岩心孔隙度测量的若干问题[J]. 石油实验地质, 2025, 47(2): 433-440. doi: 10.11781/sysydz2025020433
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

页岩油岩心孔隙度测量的若干问题

doi: 10.11781/sysydz2025020433
详细信息
    作者简介:

    张金晴(1996—),女,硕士,从事非常规油气地质、油气地球化学等方面的研究工作。E-mail: zhangjinqing@mail.iggcas.ac.cn

  • 中图分类号: TE122.1

Issues in shale oil core porosity measurement

  • 摘要: 页岩孔隙度的测试方法主要分为流体侵入法和电子/射线辐射法两大类。其中,辐射法因存在一定的局限性,目前应用范围不广。由于页岩孔隙结构具有纳米级特征,氦气凭借其分子小、化学性质稳定、渗透性优异,成为测量页岩孔隙度最常用的流体介质。氦气流体在侵入页岩内部时,其渗透效果受样品尺度和孔隙连通性的影响。块状样品因其复杂的孔隙迂曲度而需要较长的压力平衡时间,而颗粒样品能够显著改善页岩纳米孔隙的连通性,探测到更多的孔隙空间,因此所测孔隙度更加真实可靠。为了明确何种粒径具有最佳的样品代表性,并探明在页岩油岩心中复杂的可溶有机质—有机溶剂—纳米孔隙相互作用机制下溶剂抽提对孔隙度的影响,从样品尺度和溶剂抽提两个关键因素出发,系统综述了近年来页岩孔隙度测试方面的进展,并对松辽盆地白垩系青山口组页岩油岩心孔隙度进行了实测分析。研究表明,采用块样视密度和颗粒氦气孔隙度相结合的方法测试页岩油岩心孔隙度效果最佳。建议选用粒径为主体孔径的3~4个数量级的样品,这样既能保证样品的代表性,又能提高实验效率。不建议对页岩油岩心进行溶剂抽提,推荐采用低温真空干燥方法尽可能清除孔隙中含有的可溶有机质,从而提高孔隙度测量的准确性。

     

  • 图  1  松辽盆地中央坳陷区X井不同尺度岩心样品的氦气侵入法所测得的孔隙度

    Figure  1.  Porosity measurement results of core samples of different scales from well X in central depression zone of Songliao Basin using helium invasion method

    图  2  松辽盆地中央坳陷区X井样品12的扫描电镜照片

    Figure  2.  Scanning electron microscope image of sample 12 from well X in central depression zone of Songliao Basin

    图  3  松辽盆地中央坳陷区X井页岩样品孔径分布

    Figure  3.  Pore size distribution of shale samples from well X in central depression zone of Songliao Basin

    表  1  松辽盆地中央坳陷区X井白垩系青山口组页岩基础地球化学特征和矿物组成

    Table  1.   Basic geochemical characteristics and mineral composition of shale in Cretaceous Qingshankou Formation in well X of central depression zone, Songliao Basin

    样品
    编号
    深度/m ω(TOC)/% S1/(mg/g) S2 /(mg/g) Tmax/℃ IH /(mg/g) 矿物组成/%
    黏土 石英 长石 方解石 黄铁矿
    12 2 339.65 1.14 1.36 5.39 441 473 17.1 33.9 21.4 23.8 3.8
    13 2 341.38 1.48 1.66 7.78 441 526 23.1 33.2 9.3 25.5 5.4
    16 2 344.10 2.50 1.54 12.49 447 499 23.8 40.4 24.2 8.9 2.7
    22 2 360.75 1.64 1.83 7.71 440 470 24.7 33.4 18.7 20.9 2.3
    23 2 362.95 2.14 2.28 10.83 446 506 21.3 39.9 20.2 13.7 3.5
    24 2 363.93 1.18 1.33 4.62 436 392 24.3 35.8 13.3 22.5 2.3
    下载: 导出CSV

    表  2  松辽盆地中央坳陷区X井页岩样品氦气侵入法孔隙度测试结果

    Table  2.   Porosity measurement results of shale samples from well X in central depression zone of Songliao Basin using helium invasion method

    样品
    编号
    深度/m 视密度/(g/mL) 孔隙度/%
    1"柱塞样 粒径0.83~2.36 mm 粒径0.38~0.83 mm 抽提后(粒径0.83~2.36 mm)
    12 2 339.65 2.55 4.64 5.14 5.12 5.37
    13 2 341.38 2.57 3.75 4.90 4.87 4.78
    16 2 344.10 2.48 4.63 5.76 5.77 5.21
    22 2 360.75 2.51 5.60 5.79 5.93 6.69
    23 2 362.95 2.47 5.59 6.60 6.64 8.31
    24 2 363.93 2.55 5.16 5.28 5.44 5.50
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-02-19
  • 修回日期:  2025-02-06
  • 刊出日期:  2025-03-28

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