In order to better understand the formation rate and extent of submerged oil under the effect of SPM, this study selected three crude oils as test oils, which were taken from the Bohai southern oilfield (YYH), Liaohe Oilfield (LH) and Middle East (ZD), respectively. The interaction between kaolin and the test crude oils were studied. The results showed that the adsorption kinetics of the three test oils are basically similar, and the rate of sinking oils tends to be stable after exponential growth. The adsorption of the crude oils by kaolin satisfies the Langmuir isotherm, which belongs to monolayer adsorption. The saturated adsorption capacities of YYH, LX and ZD were 914, 1297 and 2083mg/g, respectively. When the concentration of SPM was 500mg/L, the maximum sinking rates of YYH, LX and ZD were 37%, 45% and 59%, respectively. Based on the adsorption mechanism, we discussed the distribution characteristics of dispersed oil droplets at the particle-water interface, and provided a model to calculate the relationship between the sinking rates and the concentration of SPM. This study can provide basic data and scientific basis for the study of numerical models of submerged oil formation and drift diffusion.
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