关键词: 琼东南盆地, 地层压力, 层速度, 水动力条件, 油气运移, 油气聚集

Abstract: By an analysis of factors affecting the velocity of seismic wave,such as Lithology,propertices of porefluids,porefluid pressure,and age of sedimentation,it is considered that seismic wave velocity can reflecte the change of subsurface fluid pressure,Trend equations of interval velocity in a single formation from boarder to the centre in a basin are established,formation pressures and water potentials as well as gas potentials are easily estimated by means of an equivalent formation depth technique,and then vertical and horizontal hydrodynamic conditions are analyzed to give an interpretation of the direction of oil and gas migration and point out the possible petroleum accumulation zone.