Abstract: The underground dynamic fluid field, i.e. underground fluid potential, is an essential factor to control migration and accumulation of hydrocarbons. Reconstructions of paleo-fluid potential during each geological period following hydrocarbon generation may be helpful to proper recognition of petroleum reservoir distribution, which can be classified as ones of paleo-porosity, paleo-buried depth and paleo-pres-sure. This paper presents the evolution models and reconstruction methods for these three paleo-parameters, and makes analysis of paleo-fluid potential in Es4 during late Dongy ing and late Minghuazhen in Bonan depression. It is indicated that the Paleogene reservoir distribution is closely related to the paleo-fluid potential evolution and the oil-gas reservoirs could be found in low-energy env ironment of low paleo-fluid po-tehfi894-2017 China Academic Journal Electronic Publishing House. All rights reserved.

Key words: Bonan depression, kinetics, potential, pressure, oil-gas migration