Research of Hydrocarbon Source,Migration and Accumulation Characteristics of Zifusi Sag

Zifusi Sag is in the east of Jianghan Basin which located in Jiangling depression.It is rich in oil and gas resources.Commercial.oil flow has shown in the Xingouzui Formation,Jingsha Formation and Qianjiang Formation of the Eogene system.In this paper,the organic geochemical characteristics of source rocks and crude oil geochemical data are used to do the comprehensive comparison of multiple indicators of oil and gas source to determine the layer of oil and gas source.According to the contrast of crude oil and sourcerock characteristics,the crude oil of Zifusi Sag is similar to the sourcerocks of the region area and different from Meihuaiqiao area.It indicates that,the crude oil of Zifusi Sag is derived from the region area.The article used deposition,tectonic evolution and hydrocarbon-generation evolution,the combination of reservoir data,dynamic analysis of the factors of oil and gas migration control,to clarify the hydrocarbon migration in the development of the dominant channel,and identify the direction and process of hydrocarbon migration.According to the analysis,there are many factors which affect the enrichment of the oil and gas of Zifusi Sag,the most important factor is the main conduit faults of the oil and gas,the thin sand which is widely distributed is also an important channel for the lateral migration of the oil and gas.