Study on prediction model of apparent permeability of shale gas reservoir based on molecular dynamics
Accurate prediction of the apparent permeability of shale gas reservoirs has been a major challenge for the industry,mainly due to its complex pore structure and the transport behavior of gas molecules on multiple scales,and the traditional macroscopic permeability model is difficult to cope with this complexity.To address this issue,this study integrates microscopic molecular dynamics simulations with macroscopic hydrodynamics theory to pro-pose a multi-scale model.The diffusion,adsorption and intermolecular interactions of gas molecules in nanopores are deeply explored through molecular dynamics simulations,reveal-ing the transport mechanism at the microscopic scale.Based on the key parameters obtained from the simulations,such as the diffusion coefficient,adsorption,and mean free range of the gas molecules,a modified apparent permeability model is developed in this study,which can more accurately predict the macroscopic flow behavior of the gas under the actual reservoir conditions.In addition,the model is validated and calibrated by experimental data to ensure its accuracy and applicability.Ultimately,the model provides important theoretical support for the effective development and capacity assessment of shale gas,and offers a new perspec-tive for the study of gas transport in complex pore media.
shale gas developmentmulti-scaleapparent permeability prediction modelmolecular dynamics simulation
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