Geochemical Characteristics of Hydrocarbon Source Rocks in Western Sichuan Depression

According to the analysis of organic carbon content,dissolved organic-matter,group components characteristics and vitrinite reflectance of the source rocks in Western Sichuan depression,it can be found that organic carbon content is varying from 0.53% to 62.02% with an average of 5.9%. Correspondingly in thermal evolution Ⅱ type kerogen takes a main part,most of them are high-mature,in the period of hydrocarbon generation. According to the analysis of chromatogram of organic saturated hydrocarbon in hydrocarbon source rock,it can be seen that the sedimentary environment of this area is inland peat paludal facies.