A MODELLING EXPERIMENT AND MECHANISM ANALYSIS OF OIL ACCUMULATION IN POD-LIKE SANDBODY

In this paper,the oil-accumulation process of pod-like water sandbody is studied by physical moelling experiments.It is considered that the comprehensive action of capillary pressure and hydrocarbon-expul sive pressure under a hydrostatic condition results in oil-water-alternating oil accumulation in sandbody.Among all experiments,the pod-like sandbody surround by nsource rocks" has the fastest oil-accumulationcourse,and that outside"source rocksn and linked up by fractures has slower one.Also,the oil accumula tion in pod-like sandbody under nsource rocks" is slower than that upper nsource rocksn.