海陆过渡相页岩储层孔隙表征方法对比研究
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中国地质大学北京能源学院

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国家科技重大专项“不同类型页岩气生成机理与富集规律研究”( 2016ZX05034-001) 资助


Comparative study on pore characterization methods of marine and continental transitional shale reservoir
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School of Energy,China University of Geosciences Beijing

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National Science and Technology Major Project

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    摘要:

    【研究目的】页岩的孔隙系统对页岩储层的评价起着重要作用,对孔隙系统的表征有着多种方法,不同实验方法都存在优点与限制,并且受到不同地区和地层样品的制约。【研究方法】本文主要采取CO2吸附、N2吸附、高压压汞实验和核磁共振实验方法对鄂尔多斯盆地山西组泥页岩样品进行研究,并对比沁水盆地太原组页岩样品的孔隙表征结果,分析不同实验对海陆过渡相页岩的适用性。【研究结果】针对海陆过渡相页岩储层不同实验的表征优势区间:NMR的优势区间为0.01~40 nm;CO2吸附优势区间为0.3~1.1 nm;N2吸附优势区间为2~50 nm;MIP优势区间为>50 nm。实验范围由大到小依次为MIP、NMR、N2吸附、CO2吸附;测试精度和最高分辨率由高到低为NMR、CO2吸附、N2吸附、MIP。【结论】NMR相较于流体注入法,当孔隙中存在闭孔和束缚水时表征更有优势,造成表征优势区间的选取不同。

    Abstract:

    【Objective】The pore system of shale plays an important role in shale reservoir evaluation. There are many experiments to characterize the pore system. Different experiments have advantages and limitations,and are restricted by different areas and strata samples. 【Methods】In this paper,CO2 adsorption,N2 adsorption,high-pressure mercury injection experiment and nuclear magnetic resonance experiment are used to study the shale samples of Shanxi Formation in Ordos Basin,In addition,the pore characterization results of Taiyuan Formation shale samples in Qinshui Basin are compared,and the applicability of different experiments to the marine terrestrial transitional shale is analyzed. 【Results】For different experiments of the marine terrestrial transitional shale reservoir,the characterization advantage interval is 0.01~40nm,0.3~1.1nm,2~50nm,respectively; The MIP advantage range is > 50nm. The experimental range is MIP,NMR,N2 adsorption,CO2 adsorption from large to small;the test accuracy and the highest resolution are NMR,CO2 adsorption,N2 adsorption,MIP from high to low. 【Conclusions】Compared with the fluid injection method,NMR has more advantages in characterization when there are closed pores and bound water in the pores,resulting in different selection of characterization advantage range.

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历史
  • 收稿日期:2020-03-16
  • 最后修改日期:2022-09-28
  • 录用日期:2022-10-04
  • 在线发布日期: 2023-02-22
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