A large part of the world's hydrocarbon resources are located in fractured reservoirs, and mass transfer phenomena play a crucial role in enhanced hydrocarbon recovery from these reservoirs. Pore-network models have been widely used to study kinetic and pore-scale micro-mechanisms. Molecular diffusion involves mass transfer and liquid-vapour phase change and can be simulated by a modified invasion percolation model. Despite the existence of separate pore-scale studies on molecular diffusion and gravity drainage, no articles have been published that evaluate the combined effect of both mechanisms. This study investigates the competitive roles of the two phenomena and

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