Abstract: Based on the interpretation of 3-D seismic data from the Shengbei Structural Zone,Taibei Depression, Tuba Basin, the authors employ the time-thickness method to analyze thestructural evolution of the main target Sanjianfang Formation in the Yenshan and Himalaya Age.It is thought that the Shengbei-2 structure is a paleostructure of Yenshan Age, developinginheritedly in Himalaya Age. Its structural development is well matched with the hydrocarbongeneration and drainage peak of the Shengbei source rocks. Spatially, the Shengbei-2 structure liesat the high position of the slope of oil-generating depression, which is a predominant direction ofhydrocarbon migration. It has a beneficial condition of forming reservoir in two ages andpreserving hydrocarbon. The Shengbei-3 structure is formed in the early Himalaya Age, locatingin the uplift area within depression. Its reservoir-forming time is during the Himalaya Age.