Accumulation dynamics and distribution of litho-stratigraphic reservoirs in South Songliao Basin

According to the relationship of the vertical positions between source rocks and reservoirs,the lithostratigraphic reservoirs were divided into 3 types as below-source, in-source and above-source. From the viewpoint of fluid dynamics, the relationship of the pressure energy and potential energy between source and reservoir in different lithostratigraphic reservoirs was studied based on the analysis of fluid potential composition characteristics. The pressure and potential differences, which constitute the fluid potential, were analyzed,and 3 driving mechanisms were proposed as below-source pressure difference driving, in-source fluid pressure difference driving and above-source potential difference driving. Also presented are petroleum accumulation dynamics and oil-gas migration-accumulation mechanisms of below-source, in-source and above-source lithostratigraphic reservoirs in the South Songliao Basin, and the controlling factors of the petroleum accumulation and distribution for the 3 types of reservoirs.