地震复合波地质属性的研究方法

Method for analysing geological property of seismic complex waves

在地震资料解释中,地震复合波的地质属性问题一直没有得到很好地解决。本文针对松辽盆地砂泥岩薄互层的地质特点,提出了用波形合成追踪法研究地震复合波地质属性的方法。该方法在地震复合波正演合成过程中有五个可以识别的特征界面,其中 C 界面是地震复合波形成的主导界面;C 至 D 界面间的地层为形成地震复合波的主要地层。因此,找准 C 界面深度是建立地震复合波与钻孔地层间有机联系的关键,对地震地质层位准确标定和利用地震剖面复合波波形信息进行岩性预测极为重要。文中的应用实例表明,用该方法在松辽盆地较好地建立了地震信息与地质信息间的对应关系,解决了一些疑难地质问题,取得了较好的勘探效果。

The tough problem of geological property of seismic complex waves has not been well solved in seismic data interpretation.Synthetic waveform tracing method for analysing the geological property of seismic complex waves is pre- sented to ascertain the geological property of thin sand and shale interbeds in Songliao basin.There are five distinquishable characteristic interfaces in synthe- sizing seismograms including complex waves,in which interface C is a dominant one that produces seismic complex waves.The interbeds between interface C and interface D are major ones which produce seismic complex waves.Hence,the correct depth of interface C is the key to reasonable correlating the seismic com- plex waves with the corresponding beds in borehole;and it is of great impor- tance to good correlation of seismic horizons with the corresponding geological horizons and to lithology prediction using seismic complex waveforms. It has been illustrated that this method results in good correlation of seis- mic informations with the corresponding geological informations,the solution of some tough geological problems and quite satisfactory exploration effect in the Songliao basin.