基于初至信息的可控震源和炸药震源地震资料匹配滤波技术

复杂地表条件下炸药震源和可控震源联合激发时,两种震源采集的地震资料存在明显的相位差异,处理中经常采用极性反转或相位调整的方法去解决,但是得到的处理结果精度不高,一致性处理效果不理想。提出了基于初至信息的可控震源资料匹配滤波技术,基本思想是对同位置激发的炸药震源和可控震源单炮记录分别进行初至拾取、拉平、叠加、子波提取处理,利用两者初至子波差异求取匹配算子,然后将匹配算子与可控震源记录褶积,完成可控震源采集数据的匹配滤波处理,实现两种震源资料的相位一致性。实际资料应用结果表明,相对于常规的极性反转或相位调整,该技术具有更好的一致性处理效果。

 Phase difference is prevalent in the seismic data collected jointly using a dynamite source and vibroseis under complex surface conditions.Overcoming this problem is a challenge because the commonly used method of reversing the polarity or adjusting the phase during data processing cannot provide an effective result.This paper thus proposes a matching filter scheme applied on vibroseis data using first arrival events.First,the scheme carries out picking,flattening,stacking and wavelet extracting on the first arrival events,which are implemented on the dynamite source and vibroseis data from the same position respectively.Next,the difference between the first arrival wavelets of the vibroseis and dynamite data is used to derive the matching operator.Finally,through the matching operator convolved with the vibroseis data,the phase consistency of the two sources of data is realized.The application results on the field data showed that the proposed scheme had a better processing effect compared with conventional polarity reversal or phase adjustment.

国家科技重大专项(2016ZX05006002)资助。