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    高压条件下CO2对页岩微观孔隙结构影响及其在页岩中的吸附特征

    张臣 周世新 陈科 李靖 陈克非 张玉红 李朋朋 孙泽祥 付德亮

    张臣, 周世新, 陈科, 李靖, 陈克非, 张玉红, 李朋朋, 孙泽祥, 付德亮, 2019. 高压条件下CO2对页岩微观孔隙结构影响及其在页岩中的吸附特征. 地球科学, 44(11): 3773-3782. doi: 10.3799/dqkx.2019.107
    引用本文: 张臣, 周世新, 陈科, 李靖, 陈克非, 张玉红, 李朋朋, 孙泽祥, 付德亮, 2019. 高压条件下CO2对页岩微观孔隙结构影响及其在页岩中的吸附特征. 地球科学, 44(11): 3773-3782. doi: 10.3799/dqkx.2019.107
    Zhang Chen, Zhou Shixin, Chen Ke, Li Jing, Chen Kefei, Zhang Yuhong, Li Pengpeng, Sun Zexiang, Fu Deliang, 2019. Impact on Microscopic Pore Structure and Adsorption Behavior of Carbon Dioxide on Shale under High Pressure Condition. Earth Science, 44(11): 3773-3782. doi: 10.3799/dqkx.2019.107
    Citation: Zhang Chen, Zhou Shixin, Chen Ke, Li Jing, Chen Kefei, Zhang Yuhong, Li Pengpeng, Sun Zexiang, Fu Deliang, 2019. Impact on Microscopic Pore Structure and Adsorption Behavior of Carbon Dioxide on Shale under High Pressure Condition. Earth Science, 44(11): 3773-3782. doi: 10.3799/dqkx.2019.107

    高压条件下CO2对页岩微观孔隙结构影响及其在页岩中的吸附特征

    doi: 10.3799/dqkx.2019.107
    基金项目: 

    国家重大专项 2016ZX05003002-004

    国家重大专项 2016B-0502

    国家重大专项 2017ZX05036003-007

    中国科学院先导专项 XDB10010103

    国家自然科学基金项目 41072105

    国家自然科学基金项目 41872147

    详细信息
      作者简介:

      张臣(1992-), 女, 博士, 主要从事非常规油气勘探开发、二氧化碳地质存储相关研究

      通讯作者:

      周世新

    • 中图分类号: P618

    Impact on Microscopic Pore Structure and Adsorption Behavior of Carbon Dioxide on Shale under High Pressure Condition

    • 摘要: 为了解高压条件下二氧化碳(CO2)对页岩微观孔隙结构改造及吸附行为,以四川盆地焦页6井页岩为研究对象,通过低温N2吸附和重量法等温吸附实验,研究了不同温压条件下CO2处理前后的页岩微观结构特征及CO2在页岩中的吸附行为.研究表明随处理温度升高,CO2作用后的页岩比表面积呈下降趋势,平均孔径和孔体积呈上升趋势,微孔、中孔比例减少,宏孔比例增大.CO2会改变页岩孔隙结构,改变程度与温度呈正相关关系.研究同时表明页岩对CO2的过剩吸附量随压力增大而增加直至达到最大值,后随压力增大而减小;绝对吸附量随压力增大而增加,在40 MPa之后,吸附量趋于稳定.页岩对CO2的吸附行为与温度压力有关,在高压条件下,Langmuir模型依然能较好地拟合CO2在页岩中的吸附.

       

    • 图  1  页岩孔体积(a)和比表面积(b)分布特征

      Fig.  1.  Pore size distribution (a) and pore specific surface distribution (b) of shale

      图  2  页岩原始样品N2吸附-脱附曲线

      Fig.  2.  N2 adsorption-desorption isotherms of original shale

      图  3  页岩扫描电镜图和能谱图

      Fig.  3.  The SEM and EDS images of shale

      图  4  不同温度条件下超临界CO2作用后页岩的N2吸附-脱附曲线

      Fig.  4.  N2 adsorption-desorption isotherms of shale samples after supercritical CO2 treatment at different temperatures

      图  5  不同温度条件下超临界CO2作用后页岩孔隙结构参数

      Fig.  5.  Pore structure parameters of shale samples after supercritical CO2 treatment at different temperatures

      图  6  页岩的CO2过剩吸附曲线(a)和绝对吸附曲线(b)

      Fig.  6.  Excess adsorption isotherms (a) and absolute adsorption isotherms (b) of CO2 on shale

      表  1  四川盆地焦石坝地区焦页6井页岩矿物组分

      Table  1.   Mineral compositions of Jiaoye 6 shale in Jiaoshiba area of Sichuan basin

      井名 深度(m) 全岩矿物组分(%) 粘土矿物组成(%)
      石英 斜长石 钾长石 方解石 白云石 黄铁矿 粘土矿物 绿泥石 伊利石 伊/蒙混层
      焦页6 2 770.0 53.6 7.7 1.3 2.7 3.5 3.0 22.0 29.0 42.0 29.0
      下载: 导出CSV

      表  2  页岩孔隙结构特征和CO2吸附特征

      Table  2.   Pore structure and CO2 adsorption characteristics of shale samples

      样品 微孔比例(%) 中孔比例(%) 宏孔比例(%) DFT孔体积(10-3cm3·g-1) BET比表面积(m2·g-1) 平均孔径(nm) Langmuir吸附量(mg·g-1) PL (MPa) R2
      原始 30 49 21 9.64 13.57 6.35 - - -
      T=40 ℃ 23 43 34 14.21 11.40 6.51 9.29 1.47 0.992
      T=60 ℃ 21 44 35 10.24 12.17 7.42 6.94 1.05 0.994
      T=80 ℃ 18 46 36 11.08 10.59 7.82 6.88 0.94 0.997
      T=100 ℃ 20 42 38 12.93 10.45 7.39 4.31 0.99 0.998
      下载: 导出CSV
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