Molecular dynamics of methane flow behavior through realistic organic nanopores under geologic shale condition: Pore size and kerogen types

•Kerogen-based nanopores with desirable pore-size and kerogen types are constructed.•MD is used to investigate methane behavior confined within kerogen-based nanopores.•Methane density distribution inside kerogen-based nanopores is 3D heterogeneous.•Methane flow capacity through realistic shale organic nanopores is underestimated.