Dibenzofuran and its alky homologues(DBFs)possess the same structure and characteristics as dibenzothiophenes and carbazoles

and their relative and total abundances are constrained by thermal-maturation and migration fractionation.Based on the hydrogen bond mechanism and the polarity caused by dipoles

dibenzofuran can also produce migration fractionation effect similar to that of carbazoles during oil migration.This paper states the chemical mechanism of the migration fractionation caused by dibenzofurans during its migration process and calculates the relative abundances of dibenzofurans by using deuterium substituted dibenzofuran as internal standard.Taking oil samples from the Tahe oilfield as typical marine oil example and those from the Fu- shan depression of Beibuwan Basin as non-marine oil example

this paper studies the depositional environment and organic matter thermal maturity by using DBFs-related geochemical parameters.By comparing with the total content of carbazoles

it is concluded that the total content of DBFs can also be used as effective geochemical parameters for tracing of oil charging pathways.