The oil-gas system and the porous media are interaction system. The three phases of vapor, liquid and solid (rock) will co-exist in the porous media when the pressure is under the saturation pressure.
The interaction energy between adsorbent and adsorbate was obtained by solid-liquidinteraction equation.
利用固—液相互作用方程，求取了吸附剂—吸附质相互作用能。
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Further analysis indicates that the above phenomena mainly result from the characteristic interaction between the liquid substrates and the solid films.