关键词: 初次运移, 运移动力, 压力分布, 动力学方法

Abstract: This paper deals with the primary migration occurring in a strata system in which a source rock is sandwiched between two carrier beds.The various geological conditions are taken into account to model pressuring process and pressure distribution in such a system.Based on the knowledge about petroleum primary migration,the phase of hydrocarbons is assumed as free phase,and pathways as pore/gorge,micro-fractures and Kerogen frame within the source rock.A numerical basin model is used to analyze the evolution of pressures and corresponding porosity.As a result of modelling,existence of higher excess pressures in source rocks and/or the sudden decrease of overpressures in neighbor permeable carriers may offer favorable migrating conditions.After discussed influences of geological and dynamic conditions affecting on migration process, the hydrodynamic analysis may be regarded as one of the most effective methods to study primary migration processes happening geo-historically in basin scale.

Key words: primary migration, migration forces, pressure distribution, dynamic method