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Unravelling the transport characteristic of shale gas in actual extraction process is significantly important to improve the gas recovery efficiency and production. But the geological complexity of shale formations in particular makes it challenging to comprehensively cognize the transport mechanisms at multiscale. Traditional shale gas transport model based on circle nanopores system would be failed to capture the realistic transport process of shale gas in the matrix consisting of abundant micro/nano-pores with complex pore structures. Towards this end, herein multiscale simulations were performed to investigate the transport characteristic and mechanism of shale gas in micro/nano-porous shale matrix combining the molecular dynamics (MD) simulations, analytical model and pore network model. MD simulations of shale gas (methane) transport in nanopores demonstrated that the transport behavior is determined …