基于压汞法与气体吸附法的页岩孔隙结构特征对比研究

发布时间：2018-12-11 17:22

【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N_2吸附与CO_2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]:Aiming at the difference of pore structure characteristics between marine and continental shale in China, Weiyuan and Jiaoshiba marine shale and Yao qu continental shale were selected as representatives, and thin slice analysis, mercury injection and gas adsorption test method were used. Based on the analysis of pore structure characteristics and controlling factors, a new standard for naming and dividing pore size is put forward. Six types of pore size, including ultrafine pore, small pore, mesopore, macropore and capillary pore, are called 2 nm,2~100 nm,0.1~1 渭 m ~ (10 渭 m) ~ 10 渭 m ~ (10 渭 m) ~ 100 渭 m ~ (100 渭 m), respectively. The 2~100nm micropore range and the porosity development degree of the samples from high to low are in order of the large pore range of 2? #? It is suggested that the pore distribution uniformity coefficient (hu,) is more developed and the gas storage capacity is stronger than that of the micro and nano-porosity samples determined by the determination of 2 # and 5 # samples and 1 #6 # sample. The DFT model was used to unify the adsorption of N-2 with the results of CO_2 adsorption and mercury injection experiments, and the continuous distribution of nano-pores was obtained.
【作者单位】：地质灾害防治与地质环境保护国家重点实验室(成都理工大学);中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室;中国科学院大学;
【基金】：中国科学院战略性先导科技专项(B类)(XDB10030100,XDB10030102);中国科学院青年创新促进会(2017092) 国家自然科学基金(41672316) 成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2016K011)资助
【分类号】：P618.13

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