江苏低信噪比地区深层地震资料处理方法研究

Deep seismic data processing method used in low S/N ratio area of Jiangsu oilfield

（1.中国石油大学（华东）地球资源与信息学院，山东东营257061；2.中国石油化工股份有限公司江苏油田分公司物探技术研究院，江苏南京210046）

Liu Jianfang,College of Geo-Resources and Information,China University of Petroleum,Dongying 257061,China

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。

There are lots of villagess, rivers, developed industries and agriculture in Jiangsu oilfield,making the acquired seismic data a poor quality. Many kinds of noise distribute widely in original shots. Energy 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 layers.In order to solve these problems,firstly,the deep noise was depressed 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 improved S/N ratio.On this basis,prestack time migration is processed and the imaging quality of deep seismic data greatly improved.