关键词: 叠后时间偏移, Kirchhof f积分法;相移加内插( PS PI)方法, Stolt偏移

Abstract:

In the most areas of SongLiao Basin in China, the primary target strata prospected at present is characterized as thin interbed,and the sandstone type is mainly the delta branch channel sand varying fast,having poor continuity and being 2～5 meters thick.Specially at FuYang oil layer,the channel changes frequently,the stratum contrast characters are not clear and lack of distinct contrast marks,so it is indicated that the reflection energy of these sections is weak,the continuity is poor, the wave wiggle changes a little,the tuning effect is heavy on seismic section,and the development of the faults and the rolling changes of the structure destroyed the completeness of the channel. All those factors increased the difficulties for reservoir prediction.By a lot of theory studies and practical work,it has been proved that applying seismic reservoir inversion techniques and full 3D visualization interpretation techniques can recognize the main channels and predict favorable reservoir more easily depending on the reasonable use of the existing seismic data and the accurate demarcations of reservoir.

Key words: poststack time migration, Kirchhoff integral method, phase shift plus interpolation(PSPI)method, Stolt migration