吉林大学学报(地球科学版) ›› 2024, Vol. 54 ›› Issue (2): 470-478.doi: 10.13278/j.cnki.jjuese.20220230

• 地质与资源 • 上一篇    下一篇

钠基蒙脱石狭缝中CH4-CO2竞争吸附与CO2埋存

龚凤鸣1,侯大力1,2,强贤宇1,向雪妮1,黄思婧1,韩鑫1,余洋阳1,顾康福1   

  1. 1.成都理工大学能源学院, 成都610059

    2.油气藏地质及开发工程国家重点实验室(成都理工大学), 成都610059

  • 出版日期:2024-03-26 发布日期:2024-04-09
  • 基金资助:

    四川省科技厅应用基础研究项目(2021YJ0352)

CH4-CO2 Competitive Adsorption and CO2 Sequestration in Na-Montmorillonite  Silt

Gong Fengming1, Hou Dali1,2, Qiang Xianyu1, Xiang Xueni1, Huang Sijing1,Han Xin1, Yu Yangyang1, Gu Kangfu1   

  1. 1. Energy College, University of Chengdu Technology, Chengdu 610059, China

    2. State Key Laboratory of Oil Gas Reservoir Geology and Development Engineering (University of Chengdu Technology),

    Chengdu 610059, China

     

    Abstract: 

  • Online:2024-03-26 Published:2024-04-09

摘要:

页岩主要由有机质干酪根和无机质黏土矿物等组成,其中干酪根和黏土矿物对CH4的吸附作用是页岩吸附气的主要来源。为了研究无机质黏土矿物中CH4吸附行为、CH4-CO2竞争吸附行为和CO2埋存规律,利用钠基蒙脱石来表征页岩中的黏土矿物,基于巨正则蒙特卡洛方法,利用Lammps软件开展不同压力、温度和孔径下的流体吸附模拟。结果表明:随着压力增大,各孔径下CH4超额吸附量先增加后减少,并在11~12 MPa间达到峰值;随着温度升高,各孔径下CH4超额吸附量逐渐减少;随着孔径的增大,CH4超额吸附量逐渐减少。小孔径下,CH4在钠基蒙脱石中主要以吸附态赋存,随着孔径的增大,CH4在钠基蒙脱石中处于吸附态和游离态共存的状态,并且钠基蒙脱石对CH4的作用类型为物理吸附。CO2的驱替效率随CO2初始压力的升高而增大,随孔径的增大而增大。CO2埋存量随温度的升高而降低,随注入压力的升高而升高,随孔径的增大而降低。CO2与CH4竞争吸附比随压力的增大而降低,随孔径的增大而升高。

关键词: 钠基蒙脱石, 狭缝, 巨正则蒙特卡洛法, 竞争吸附, CO2埋存

Abstract:

Shale is mainly composed of organic kerogen and inorganic clay minerals, and the adsorption of kerogen and clay minerals on CH4 is the main source of shale adsorbed gas. In order to study the adsorption behavior of CH4, competitive adsorption behavior of CH4-CO2 and the law of CO2 embedding in inorganic clay minerals, using Na-montmorillonite to characterize clay minerals in shale, and using Lammps software to simulate fluid adsorption at different pressures, temperatures and pore sizes based on the grand canonical Monte Carlo method. The results show that with the increase of pressure, the excess adsorption capacity of CH4 increases first and then decreases at each pore size, and reaches a peak value between 11 and 12 MPa. With the increase of temperature, the excess adsorption amount of CH4 decreased gradually at each pore size. With the increase of pore size, the excess adsorption amount of CH4 decreased gradually. At small pore size, CH4 mainly exists in the form of adsorption in Na-montmorillonite, and with the increase of pore size, the adsorption state and the free state of CH4 coexist in Na-montmorillonite, and the action type of Na-montmorillonite on CH4 is physical adsorption. The CO2 displacement efficiency increases with the increase of initial CO2 pressure and pore size. CO2 storage decreases with increasing temperature, increases with increasing injection pressure, and decreases with increasing pore size. The competitive adsorption ratio of CO2 and CH4 decreased with the increase of pressure and increased with the increase of pore size.

Key words: Na-montmorillonite, silt, grand canonical Monte Carlo method; , competitive adsorption, CO2 sequestration

中图分类号: 

  • TE122
[1] 蔡灵慧, 余烨, 郭建华, 黄俨然, 郭原草.

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