When gas transport in tight shale reservoirs at the nanoscale, the major transport mechanism is slip flow or diffusion, or others?
Well,
Depending on(Nature of migration)
Free movement (slip flow) occurs for oil and hydrocarbons in general, but
Diffusion migration is most likely caused by gas migration and light hydrocarbons.
Sincerely
Gas transport in tight gas reservoirs can generally be described by both free molecular diffusion (collision between the gas molecules) and Knudsen diffusion (collision between the gas molecule and the pore wall surface) as the associated pore size distribution has relatively a broader range, say, between 10 - 1000 nm.
On the other hand, the gas transport through shale gas reservoirs is characterized by both free gas as well as by adsorbed gas - as the pore size distribution is relatively small (1 - 100 nm). Dominant free gas could lead to free molecular diffusion, while the dominant adsorbed gas might lead to Knudsen diffusion.
If the pore size falls below 1 nm, then, surface diffusion would play a critical role.
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