【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。更多还原

【Abstract】 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.更多还原