Abstract：The characteristic of n-alkane distributions of 8 kinds of marine fuel,8 kinds of Middle East crude oil and 13 kinds of non-Middle East crude oil were analyzed by GC-FID.The diagnostic ratios with the geochemical significance and the strong anti-weathering such as n-C17/Pr,n-C18/Ph,Pr/Ph, LMW/HMW,CPI and (n-C19+n-C20)/(n-C19~n-C22) were used as modeling parameters,Fisher discriminant of these 29 kinds of oils were performed.Since n-C17/Pr and n-C18/Ph were collinear and n-C17/Pr of marine fuel had obviously changes during weathering,n-C17/Pr cannot be used as a modeling parameter.The Wilks's lambda distribution of modeling corresponded to P value of 0,which indicated the discriminant model was valid,and the identification accuracy of model was 93.1%.The identification accuracy of oils after short-term weathering for 30 days could also reach 93.1%,this meant that the established model was also applicable to identification of weathered oil spills.
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