【摘要】 松辽盆地中浅层之上地层的压实程度低,对地震波吸收衰减作用明显,对高频成分的衰减尤为严重,如何恢复和补偿被大地吸收的地震波高频成分,从而提高地震资料的垂向分辨率,解决薄储层地震识别问题,是地震资料处理急需解决的技术难题.本文基于零偏VSP数据的初至波主频率随深度下降的关系,应用主频偏移法逐点求得随深度变化的地层品质因子Q;按照坳陷盆地层状介质的特点,依据地震速度和主要反射界面将目的层上部坳陷期地层划分为多层常数Q模型,实现Q值场的时变和空变.在叠前、叠后地震数据体上,采用增益控制Q值高频补偿和相位校正技术,提高地震资料的分辨率.大庆油田常家围子三维地震工区应用该技术的成果数据,频带展宽5Hz以上,主要反射层同相轴连续性增强,层间反射细节突出,与测井及VSP数据的匹配程度提高,为该区油藏评价研究奠定了资料基础.更多还原

【Abstract】 The strata overlaid on the target zone in Songliao Basin have not been compacted highly,that lead seismic waves being obviously attenuated as they travel through,especially for the high frequency seismic components.How to recovery or compensate the attenuated high frequency components in order to improve the seismic resolution is a tough issue for seismic data processing.In this paper,based on the relationship that the frequency of direct wave of zero-offset VSP data is decreased as the depth increasing,the earth quality factor Q in each depth is calculated by using the main frequency shift method.On the light of seismic velocity and major reflector,the strata have vertically been divided into multi layers and each of them has a consistent Q.Then the Q model of subsurface is build of time and space variation.We present a method for seismic data high frequency compensation and phase correction on pre-stack and post-stack seismic data of Changjiaweizi 3D seismic survey,Daqing oilfield.The results demonstrate that the seismic frequency band is extended more then 5Hz,the major reflectors are transversely toned up,the internal reflections among layers are boosted up and the seismic data is tied highly with well logging and VSP data.That provides benefits for reservoir evaluation of this area.更多还原