李志清, 沈鑫, 戚志宇, 胡瑞林. 2017: 基于压汞法与气体吸附法的页岩孔隙结构特征对比研究. 工程地质学报, 25(6): 1405-1413. DOI: 10.13544/j.cnki.jeg.2017.06.002
    引用本文: 李志清, 沈鑫, 戚志宇, 胡瑞林. 2017: 基于压汞法与气体吸附法的页岩孔隙结构特征对比研究. 工程地质学报, 25(6): 1405-1413. DOI: 10.13544/j.cnki.jeg.2017.06.002
    LI Zhiqing, SHEN Xin, QI Zhiyu, HU Ruilin. 2017: COMPARATIONS BETWEEN MERCURY INTRUSION AND GAS ADSORPTION FOR PORE STRUCTURE CHARACTERISTICS OF SHALE. JOURNAL OF ENGINEERING GEOLOGY, 25(6): 1405-1413. DOI: 10.13544/j.cnki.jeg.2017.06.002
    Citation: LI Zhiqing, SHEN Xin, QI Zhiyu, HU Ruilin. 2017: COMPARATIONS BETWEEN MERCURY INTRUSION AND GAS ADSORPTION FOR PORE STRUCTURE CHARACTERISTICS OF SHALE. JOURNAL OF ENGINEERING GEOLOGY, 25(6): 1405-1413. DOI: 10.13544/j.cnki.jeg.2017.06.002

    基于压汞法与气体吸附法的页岩孔隙结构特征对比研究

    COMPARATIONS BETWEEN MERCURY INTRUSION AND GAS ADSORPTION FOR PORE STRUCTURE CHARACTERISTICS OF SHALE

    • 摘要: 针对中国海相与陆相页岩孔隙结构特征的差异性,选取威远与焦石坝海相页岩及瑶曲陆相页岩为代表,采用薄片分析、压汞及气体吸附试验方法,开展孔隙结构特征与控制性因素分析,提出了孔隙大小命名划分新标准,将 < 2 nm、2~100 nm、0.1~1μm、1~10μm、10~100μm、>100μm分别称为超微孔、微孔、小孔、中孔、大孔、毛细孔6类,其中2~100nm微孔范围,样品孔隙发育程度由高到低依次为2#、5#、1#、6#、4#,10~100μm大孔范围,孔隙发育程度由高到低依次为2#、1#、4#、6#、5#;提出了孔隙分布均匀系数hu,经判定2#与5#样品与1#、4#、6#样品相比微纳米孔隙更发育,储气能力更强。采用DFT模型将N2吸附与CO2吸附结果及压汞实验结果统一起来,获得了纳米孔隙的连续分布规律。

       

      Abstract: According to the differences of pore structure characteristics between marine and continental shale in China, the Weiyuan and Jiao Shiba marine shale and Yaoqu continental shale are selected to test. The main test methods contain thin section analysis, mineral and main quantity analysis, low field scanning microscopy, mercury injection and gas adsorption. Based on the research results of pore structure characteristics and controlling factors, the new standards of pore size naming are put forward. The pores are divided into < 2nm, 2~100nm, 0.1~1μm, 1~10μm, 10~100μm, >100μm. They are respectively called ultramicropore, micropore, small hole, middle hole, big hole, and capillary hole. The sample porosity development degree from high to low in turn are 2#, 5#, 1#, 6#, 4# in 2~100nm pore range. The samples porosity development degree from high to low in turn are 2#, 1#, 4#, 6#, 5# in 10~100μm pore range. Pore distribution uniformity coefficient hu is proposed. Micro-nano pore of sample 2 and sample 5 are more development comparing to other samples. Also gas storage capacity of sample 2 and sample 5 are stronger. The test results of N2 adsorption, CO2 adsorption by using DFT model and mercury intrusion can be unified to attain continuous distribution of nanometer pore.

       

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