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    基于Ono-Kondo格子模型的页岩气超临界吸附机理探讨

    周尚文 王红岩 薛华庆 郭伟 李晓波

    周尚文, 王红岩, 薛华庆, 郭伟, 李晓波, 2017. 基于Ono-Kondo格子模型的页岩气超临界吸附机理探讨. 地球科学, 42(8): 1421-1430. doi: 10.3799/dqkx.2017.543
    引用本文: 周尚文, 王红岩, 薛华庆, 郭伟, 李晓波, 2017. 基于Ono-Kondo格子模型的页岩气超临界吸附机理探讨. 地球科学, 42(8): 1421-1430. doi: 10.3799/dqkx.2017.543
    Zhou Shangwen, Wang Hongyan, Xue Huaqing, Guo Wei, Li Xiaobo, 2017. Discussion on the Supercritical Adsorption Mechanism of Shale Gas Based on Ono-Kondo Lattice Model. Earth Science, 42(8): 1421-1430. doi: 10.3799/dqkx.2017.543
    Citation: Zhou Shangwen, Wang Hongyan, Xue Huaqing, Guo Wei, Li Xiaobo, 2017. Discussion on the Supercritical Adsorption Mechanism of Shale Gas Based on Ono-Kondo Lattice Model. Earth Science, 42(8): 1421-1430. doi: 10.3799/dqkx.2017.543

    基于Ono-Kondo格子模型的页岩气超临界吸附机理探讨

    doi: 10.3799/dqkx.2017.543
    基金项目: 

    国家重点基础研究发展计划(973计划)项目 2013CB2281

    详细信息
      作者简介:

      周尚文(1987-), 男, 工程师, 主要从事页岩气实验方法和技术研究

    • 中图分类号: P624.7

    Discussion on the Supercritical Adsorption Mechanism of Shale Gas Based on Ono-Kondo Lattice Model

    • 摘要: 页岩气吸附机理的研究对于页岩气成藏和储量评价具有重要意义.甲烷在地层温度和压力条件下处于超临界状态,页岩气的吸附实际上为超临界吸附,但其机理目前尚不明确.在建立Ono-Kondo格子模型的基础上,结合低温氮气吸附和高压甲烷等温吸附实验,对龙马溪组页岩的微观孔隙结构和超临界吸附曲线进行了分析.结果表明,页岩中发育的孔隙尺度较小,比表面积较大,吸附气主要赋存于微孔和中孔中;页岩的等温吸附曲线在压力较大时,必然存在下降的趋势,这并非异常现象,而是超临界甲烷过剩吸附量的本质特征.Ono-Kondo格子模型对页岩高压等温吸附曲线的拟合效果很好,相关系数均在0.99以上,说明该模型可以表征页岩纳米孔隙中超临界甲烷的吸附特征.基于拟合得到的吸附相密度可将过剩吸附量转换为绝对吸附量,并直接计算地层温度和压力下甲烷的吸附分子层数,计算层数均小于1,表明甲烷分子并没有铺满整个孔隙壁面.因此受流体性质、吸附剂吸附能力和孔隙结构3个方面的影响,页岩气的吸附机理为单层吸附,不可能为双层甚至多层吸附.

       

    • 图  1  甲烷在狭缝孔隙中吸附的格子模型

      Fig.  1.  The sketch of lattice model for methane adsorption in slit pores

      图  2  低温氮气吸附实验结果分析

      Fig.  2.  Analysis of experimental results of nitrogen adsorption at low temperature

      图  3  高压等温吸附曲线实验测试结果

      Fig.  3.  Experimental results of high pressure isothermal adsorption curve

      图  4  Ono-Kondo格子模型曲线拟合结果

      Fig.  4.  High pressure isothermal adsorption curve fitting results by Ono-Kondo lattice model

      图  5  吸附相体积、吸附分子层数和吸附气比例计算结果

      Fig.  5.  Calculation results of the adsorbed phase volume, the number of adsorbed layers and the proportion of adsorbed gas

      表  1  样品比表面和孔体积分析结果

      Table  1.   Analysis results of specific surface area and pore volume of shale samples

      样品编号 TOC(%) Stotal(m2/g) Smicro(m2/g) Smeso(m2/g) Vtotal(cm3/g) Vmicro(cm3/g) Vmeso(cm3/g)
      X3-1 3.1 9.83 2.22 7.64 0.023 05 0.001 15 0.021 84
      X3-2 4.3 11.81 3.22 8.91 0.023 14 0.001 68 0.021 72
      X3-3 3.7 12.17 3.64 8.81 0.022 84 0.001 91 0.021 25
      X3-4 3.5 11.90 3.45 8.78 0.024 18 0.001 80 0.022 66
      注:Stotal为BET方程计算的样品总比表面积,m2/g;Smicro为t-plot方法计算的微孔比表面积,m2/g;Smeso为BJH方程计算的中孔比表面积,m2/g;Vtotal为BET方程计算的样品总孔体积,cm3/g;Vmicro为t-plot方法计算的微孔体积,cm3/g;Vmeso为BJH方程计算的中孔体积,cm3/g.
      下载: 导出CSV

      表  2  Ono-Kondo格子模型参数拟合结果

      Table  2.   Results of parameter fitting by Ono-Kondo lattice model

      样品编号 am
      (mmol/g)
      εs/
      kT
      ρmc
      (g/cm3)
      nabs-f
      (mmol/g)
      相关系数
      R2
      X3-1 0.038 2 -3.234 0.263 7 0.069 52 0.996
      X3-2 0.045 5 -3.496 0.305 1 0.084 65 0.993
      X3-3 0.043 8 -3.369 0.284 5 0.079 64 0.994
      X3-4 0.039 1 -3.536 0.318 7 0.074 16 0.997
      注:nabs-f为地层压力条件下的页岩绝对吸附量.
      下载: 导出CSV
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    • 收稿日期:  2017-01-22
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