应用叠前时间偏移/反偏移与CRS-OIS叠加削弱倾角歧视影响  

Dip discrimination reduction with CRS-OIS

作　　者：王征[1,2] 杨锴[3] 董水利[2] 金翔龙[1,4,5] 方念乔[1] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中海油田服务股份有限公司,天津300451 [3]同济大学海洋地质国家重点实验室,上海200092 [4]国家海洋局海底科学重点实验室,浙江杭州310012 [5]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《石油地球物理勘探》2015年第5期839-847,802,共9页Oil Geophysical Prospecting

基　　金：中海油田服务股份有限公司自主课题(E-23132012);国家自然科学基金面上项目(41274117);海洋地质国家重点实验室自主课题(MG20130304)资助

摘　　要：为了更好地削弱倾角歧视影响,将叠前时间偏移/反偏移与输出道成像方式的共反射面元叠加算法(Common Reflection Surface Stack by the Output Imaging Scheme,以下简称CRS-OIS)相结合,把常规预处理后的地震数据进行叠前时间偏移映射到成像空间,在该空间内实施CRS-OIS处理,再用相同的速度场将其反偏移到叠前数据空间。基于这种处理流程不仅得到信噪比明显提高的叠前地震数据,同时削弱了CRS叠加方法固有的倾角歧视影响。理论数据与实际资料的处理结果均证实了该法的有效性和实用性。The common-reflection-surface stack combined with output imaging scheme(CRS-OIS)is a novel technique to implement CRS stack based on a unified Kirchhoff imaging approach.It is a better option than conventional CRS stack to deal with conflicting dip problems.However,we think the CRS-OIS can do more in this aspect.In this paper,we propose a work-flow to handle dip discrimination phenomenon based on a cascaded implementation of prestack time migration,CRS-OIS and prestack time demigration.Firstly,a common offset prestack time migration is implemented.Then,a CRS-OIS is applied to the time-migrated common offset gather.Afterwards,aprestack time demigration is performed to reconstruct each unmigrated common offset gather,it is confirmed that this method can give a better solution after modeling data and field data processing test.

关 键 词：偏移/反偏移 输出道方式的共反射面元方法 数据规则化 噪声压制 倾角歧视现象 

分 类 号：P631[天文地球—地质矿产勘探]