The availability of shale oil directly affects the degree of effective exploration and development

and the mobility of shale oil is closely related to its occurrence state. Therefore

studying the occurrence state of shale oil plays an important role in its development. The pore model is established by graphene and quartz

and the occurrence state of n-octane and its mixture in nanopores is studied by molecular simulation method. The effects of pore size

temperature

pressure

shale oil composition

wall wettability and wall composition on the occurrence state are analyzed. The results show that: ①shale oil is multi-layer adsorbed in the pores and symmetrical about the pore center

and the thickness of the adsorption layer is 0.4~0.5 nm; ②The larger the pore size of the reservoir

the higher the temperature

the lower the pressure

the lighter the molecular component

the weaker the polarity

and the higher the wall wettability are

the more unfavorable the adsorption of oil molecules on the wall is;③ In the combined wall

due to the influence of graphene wall

the adsorption amount of shale oil molecules increases with the increase of quartz wall wetting humidity. In addition

the adsorption transfer phenomenon of n-hexanoic acid and cyclohexane also occurs.