Abstract: Based on the basic principle on fluid potential simulation during the study on hydrocarbon migration in the petroliferous basin, this paper gives its core equation—overpressure equation, and discusses its geological significance. Moreover, case study is made and the result analysed in northern Tarim basin. Finally, the relation between fluid potential distribution and hydrocarbon migration is discussed.

Key words: Tarim basin, Fluid, Potential energy, Overpressure, Equation, Simulation, Hydrocarbon migration