天然气工业2026，Vol.46Issue(2)：79-90,12.DOI:10.3787/j.issn.1000-0976.2026.02.008
基于格子Boltzmann方法的超临界甲烷多层吸附模拟
Simulation of multilayer adsorption of supercritical methane based on the lattice Boltzmann method
摘要
Abstract
Adsorbed gas represents a unique occurrence state of methane in shale gas reservoirs,distinct from conventional gas.Its adsorption behaviors significantly impact the reserves assessment and production performance numerical simulation of shale gas reservoirs.The current studies on adsorbed gas using the lattice Boltzmann method(LBM)are mostly based on the monomolecule layer(or monolayer)adsorption model,which is inconsistent with findings from that reveal evident multimolecule layer(or multilayer)adsorption of shale gas in micro-and nano-pores.This discrepancy leads to an incomplete understanding of gas occurrence and transport mechanisms.To address this issue,a Lattice Boltzmann model that incorporates supercritical multilayer gas adsorption was constructed to investigate the multilayer adsorption mechanisms of supercritical methane in micro-and nano-pores on gas mass transfer.The following results are obtained.First,compared to monolayer adsorption,multilayer adsorption can more accurately represent shale gas occurrence.Second,the surface diffusion velocity of gas in the adsorption layers decreases with increasing pressure and increases with rising temperature,exhibiting a typical thermodynamic sensitivity.Third,the increase in adsorption distance weakens the confinement of pore walls on methane molecules,resulting in higher flow velocity in the second adsorption layer than in the first adsorption layer.Fourth,under decreased pore diameter,multilayer adsorption significantly enhances the contribution of surface diffusion to total flux,while intensifying flow restriction and reducing matrix permeability.The conclusion is that the Lattice Boltzmann model established in this study provides a more scientific and reasonable representation of the multilayer adsorption phenomenon of supercritical methane in shale reservoirs,offering theoretical insights into fluid occurrence and mass transfer in deep,high-pressure shale gas reservoirs.关键词
页岩气/多层吸附/格子Boltzmann方法/超临界状态/流体赋存Key words
Shale gas/Multilayer adsorption/Lattice Boltzmann method/Supercritical state/Fluid occurrence分类
能源科技引用本文复制引用
赵玉龙,甘飘,刘香禺,葛枫,赵伟,张烈辉,陈掌星,关博文,张涛..基于格子Boltzmann方法的超临界甲烷多层吸附模拟[J].天然气工业,2026,46(2):79-90,12.基金项目
国家自然科学基金优秀青年科学基金项目"页岩气多尺度非线性渗流力学"(编号:52222402),国家自然科学基金重点项目"海相页岩水平井超临界二氧化碳压裂机理与一体化模拟研究"(编号:52234003),国家自然科学基金面上项目"致密砂岩气藏注CO2增压驱替-竞争吸附-改善渗流协同提采与封存机理研究"(编号:52474047),中国石油-西南石油大学创新联合体项目"川南深层与昭通中浅层海相页岩气整体动用理论与技术"(编号:2020CX020202)、"不同构型页岩储层流体流动规律及开发优化理论与方法"(编号:2020CX030202). （编号:52222402）
