【摘要】 江苏油田村庄密集,水网密布,工农业发达,野外采集资料品质较差。原始单炮记录上噪声类型多,分布广;深层能量弱,高频成分损失严重;深层资料信噪比低,成像困难。针对这些问题,首先对深层噪声进行了压制,保留深层的有效波信息;然后对深层的有效信号进行能量补偿,拓宽目的层频带,进行频率补偿,得到了较好的深层资料信息;最后对浅、中、深层资料进行可变扩展面元叠加,提高了资料的信噪比,在此基础上进行叠前时间偏移,使深层资料的成像质量得到了较大的改善。更多还原

【Abstract】 There are lots of villagess,rivers,developed industries and ag- riculture in Jiangsu oilfield,making the acquired seismic data a poor quality.Many kinds of noise distribute widely in original shots.En- ergy is weak and high frequencies are seriously lost in seismic data of deep layers.So S/N is low and imaging is difficult for deep lay- ers.In order to solve these problems,firstly,the deep noise was de- pressed and the effective wave preserved.Then,some measures were taken for effective signals of deep layers,including energy compensation,enlargement of target frequency width,frequency compensation.After taking these measures,good deep layer data were achieved.Finally,variable extended bin stacking was carried out on shallow,middle,and deep depths of seismic data,greatly im- proved S/N ratio.On this basis,pre-stack time migration is pro- cessed and the imaging quality of deep seismic data greatly im- proved.更多还原