流体动力系统与油气成藏作用

在一个含油气盆地，尤其是大型复杂的含油气盆地中，往往存在多个流体动力系统，每个系统具有相对稳定的边界及相对统一的压力体系，其中的油气藏具有类似可比的成藏条件和成藏作用。流体动力系统可分为重力驱动型、压实驱动型、封存型和滞流型四种类型。不同类型的流体动力系统，由于其开放程度不同，系统内部的物质流和能量流也有强弱之分和相对重要性的差别，水动力、热动力和地应力在油气成藏中作用的相对重要性是不同的，有不同的成藏动力条件，在油气勘探中研究的思路和侧重点也不同。实践表明，用流体动力系统分析的原理研究油气藏形成和分布规律，对指导油气勘探有十分重要的意义。

FLUID DYNAMIC SYSTEMS AND THE FORMATION OF OIL AND GAS POOLS

In a petroliferous basin,especially a comples basin of great amplitude,often exist several fluid dynamic systems.Each system,in which oil and gas pools have similar formation conditions and comparable history,possesses relatively stable frontiers and unique pressure regime.Fluid dynamic systems can be classified into four types,i.e.,gravity-driven,compaction-driven,pressure compartmentation and no-flow systems.Different type of systems with different openness have different relative importance of hydrodynamic, thermodynamic and stress-induced forces in oil and gas pools formation.In oil and gas exploration,working hypothesis is different for different type of fluid dynamic systems.A case study indicates that the principal of fluid dynamic systems approach is very efficient and helpful in analyzing the formation and occurrence of oil and gas pools.