Evaluation on Hydrocarbon Generation of Source Rocks of Well X in Y Exploration Region

The dark color mudstones of Well X in Z Depression were taken as the object of study,the advantage of many parameters such as organic matter abundance,the type and maturity of organic matter was used to describe quantitatively or qualitatively the hydrocarbon-generating potential characteristics of the dark color mudstone,through the analysis of organic carbon(TOC),hydrocarbon potential (Pg),chloroform bitumen A ,kerogen maceral,kerogen carbon isotope,kerogen elemental composition,vitrinite reflectance(Ro) and sporinite color index(SCI),etc.The results indicate that the organic matter abundance of the source rocks in Y Region and in the 2nd member of Suhongtu Formation of Lower Cretaceous is lower ,the thermal evolution is at the lower mature stage,and the organic matter type is III,but the hydrocarbon-generating potential is the highest,it is the main hydrocarbon source rock of Z Sag.The organic matter abundance of Lower Cretaceous Bayingebi Formation and Jurassic is higher,where organic matter type isⅡ,their hydrocarbon source rock maturity is at the mature stage,while their hydrocarbon-generating potential is the lowest,therefore,they are the secondary hydrocarbon source rock of Z Sag.