利用LIFT技术衰减海上近道多次波  

Application of LIFT technology in demultiples of small offset

作　　者：李添才[1,2] 李列[3] 陈瑜[2] 万欢[2] 刘金朋[2] 丘斌煌[2] 

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130012 [2]中国海洋石油总公司采技服特普地球物理分公司,广东湛江524057 [3]中国海洋石油总公司湛江分公司,广东湛江524057

出　　处：《勘探地球物理进展》2010年第2期107-111,共5页Progress in Exploration Geophysics

基　　金：国家重大科技专项子专题"莺琼盆地高温高压区高精度地震资料采集处理技术研究"(2008ZX050000230401)资助

摘　　要：近道多次波压制是目前海上地震资料处理的一大难题,特别是在浅层气的影响下,近道多次波更是难以压制。常规近道多次波衰减技术在压制多次波的同时,有效信号也受到压制。为此,提出了一种有效衰减近道多次波的LIFT技术,该技术针对有效反射在近中远偏移距均有分布,而近道多次波主要集中在近道的特点,基于局部时窗的AVO原理模拟有效信号,从而达到信噪分离的目的。实际资料处理证实了该技术既能有效衰减近道多次波,又能很好地保留有效信号。Near-offset multiples are difficult to be removed in offshore seismic data,especially when the data were affected by shallow gas during acquisition. Traditional techniques used for near-offset multiple suppression may do harm to the effective signal. In this article,LIFT technique is adopted to attenuate multiples. The main theory is that the near-offset multiples can only distribute in near offset gathers whereas effective reflections mainly distribute in medium and large offset gathers. According to AVO theory,this method separates signals and noises in a time window. The effectiveness of this method was verified on real data.

关 键 词：地震数据处理 LIFT技术 AVO模拟 近道多次波 衰减 

分 类 号：P631.4[天文地球—地质矿产勘探]