Abstract: The organic matters retained in argillaceous source rocks are of various occurrences, including free state and mineral-binding state organic matters which have quite different geochemical natures and different significance in detailed source rock evaluation. However, a comprehensive quantitative characterization technique for both occurrences has not been established yet. With the argillaceous source rocks sampled from the middle Es3, the lower Es3 and the upper Es4 of the Shahejie formation, Dongying sag, and based on the analysis on the changes of pyrolysis parameters during the processes of solvent extraction and sequential chemical treatment including the variations of free hydrocarbon, cracked hydrocarbon and TOC, the paper measures the abundance of the organic matters with different occurrences quantitatively and establishes a quantitative characterization method of retained organic matters with different occurrences. The results show that the quantity of soluble organic matters of mineral-binding state is quite large in the organic matters retained in source rocks. Traditional evaluation methods such as Rock-Eval pyrolysis method and chloroform bitumen A method have some limitations. Profound study on the geochemical characteristics of the organic matters of mineral-binding state will widen the knowledge of hydrocarbon generation theory and retained hydrocarbon occurrences