保持振幅特征的近炮点多次波消除方法

Near-source multiple elimination with amplitude preserved

随着入射角的不同，地震反射液的能量有差异。然而在采用样点调序法消除多次波时，由于未考虑地检距方向的振幅变化，因此对有效信号造成了损害，影响了该方法的使用效果。针对这一问题，本文首先采用最小二乘法线性回归来确定反射信号的振幅变化规律，再对原始数据进行相应的补偿，使各道的有效波振幅达到一致，满足了样点调序法的假设条件，从而改善了使用效果。实际资料处理结果表明，应用本文方法可有效地消除近炮点道上的多次波，并提高了叠加剖面的信噪比。

The energy of seismic reflection wave varies with the change of incident angle.To neglect the amplitude variation along offset direction in eliminating multiples byresequencing data samples will damage useful waves and thus reduce the effect ofresequencing method- To cope with this problem, we first determine amplitudevariation law of reflection signals by doing least square linear regression analysis,then conduct amplitude compensation of raw seismic data to make consistent theamplitudes of corresponding useful reflections at all traces, thus meeting the re-quirement of sample resequencing and improving the application effect- Real dataresults say that the method can be used to eliminate the multiples of near-sourcetraces to raise the signal/noise ratio of stack section.