吸附
分形维数
分形
油页岩
材料科学
分子动力学
热力学
体积热力学
页岩气
化学物理
化学
物理化学
物理
地质学
计算化学
数学
数学分析
古生物学
作者
Liehui Zhang,Jianchao Li,Jia Du,Yulong Zhao,Chunyu Xie,Zhengwu Tao
出处
期刊:Fractals
[World Scientific]
日期:2018-04-01
卷期号:26 (02): 1840004-1840004
被引量:25
标识
DOI:10.1142/s0218348x18400042
摘要
As one of the key status of gas in shale reservoir, adsorption gas accounts for considerable percentage of total gas amount. Due to the complexity and nanostructure of shale gas reservoir, it is very challenging to represent adsorption gas through traditional methods. However, the integration of the fractal theory and molecular dynamics (MD) simulation may provide a new perspective of understanding such nanostructure and the micro-phenomenon happening in it. The key purpose of this paper is to investigate the adsorption phenomenon in shale kerogen. By using MD simulation and grand canonical Monte Carlo (GCMC) algorithm, the adsorption of methane in 2, 5 and 10[Formula: see text]nm slit-like pores is simulated for different temperature and pressure status. According to the results, the average gas density in smaller pores is higher than that in bigger pores, and multilayer adsorption presents on some areas of pore surfaces. Then, the simulation results are analyzed using the multilayer fractal adsorption model. The analysis indicates that the number of adsorption layer increases with pressure increase: four-layer adsorption presents in 10[Formula: see text]nm pores while three-layer adsorption shows up in 2[Formula: see text]nm and 5[Formula: see text]nm pores due to pore volume limit. Fractal dimension of pore wall surface generated in this study is in the range of 2.31–2.63. Moreover, high temperature could decrease the adsorption behavior in reservoir condition.
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