Evaluation of Hydrocarbon Source Rocks of Ganquan Formation in Dahulishan Region,Ejina Banner

Based on the data of cross sections and organic geochemistry measurements,the distribution characteristics,organic matter abundance,organic matter type and organic matter maturity index of hydrocarbon source rock are analyzed of Ganquan Formation in Dahulishan Region. The result shows that the thickness of dark mudstone is 240. 1 m and was deposited in shallow marine shelf environment. TOC content ranges from 0. 35 to 2. 87 weight percent with an average value of about 1. 01 weight percent. According to the relationships between the ratios of Pr / n-C17and the ratios of Ph / n-C18,Steranes C27-C28-C29triangle figure,the organic matter type is dominantly Ⅱ1 type. The characteristics of vitrinite reflectance,clay mineral show that the source rocks turn into over-mature stage,which is probably affected by dynamic metamorphism. It is concluded that the hydrocarbon source rocks of Ganquan Formation have good hydrocarbon generation potential.