用P-SV转换波资料研究储层各向异性

Reservoir anisotropy analysis using P-SV wave data.

四川盆地的油气层大多为裂缝一孔隙里储集层。这种特殊的地质条件，很适合用横波的偏报特性寻找储层的裂缝发育带。为此，在该盆地灵音寺地区，采集了高质量的P－SV转换波资料。通过资料处理发现，穿越下二叠统储层的转换波发生了明显的分裂现象，快、慢根波的振幅差异、各向异性系数的大小均与储层裂缝强度的横向变化紧密相关。由此说明，利用P－SV转换波资料是检测裂缝发育带的有效方法。

Hydrocarbon reservoirs in Sichuan basin are usually some fractured and porousreservolrs. ln such speclal geological condition, S-wave polarization can be usedfavourably to detect dense fissure belt in reservoir. Field seismic acquisition offeredquality P-SV wave data in Lingyinsi area. We can see from the processed seismic da-ta that converted waves which go through the low Permian system branch very obvi-ously,and that anlsotropy coefficient and amplitude difference between fast S-waveand slow S-wave are closely related to lateral fissure variation of hydrocarbon reser-voir. The phenomena mean that P-S wave data can be a useful tool for detecting fis-sure belts in hydrocarbon reservoir.