常规滤波方法对浅海多次波压制不能取得理想效果. 通过改变模型表面边界条件, 求解波动方程实现多情 景地震数值模拟.利用自由边界条件模拟时获得含海平面强反射多次波地震记录, 而利用吸收边界条件时得到理想 条件下无多次波地震记录.对比分析多次波对有效地震信号的影响得到海平面强反射多次波改变了有效地震信号的 振幅、频率和相位. 利用归一化方法计算得到压制多次波滤波器算子, 并作用于含海平面强反射多次波地震记录. 叠 加地震剖面对比分析表明,归一化滤波器算子较好的压制了地震记录中的多次波, 提高地震资料分辨率. 最后, 根据 多次波产生条件,给出了利用实际区域简化地质模型的地震数值模拟结果计算归一化滤波器算子的方法, 从而利用 该方法压制实际地震数据中多次波.The conventional filtering method can not work well in marineseismic multiple attenuating for shallow water. Seismic numerical simulationin different conditions was done by solving wave equation and changing the surface border conditions. Seismic with multiple produced by strong reflectionof seasurfacecan be modeled withfree border conditions , and seismic without multiplecan be modeled withabsorbing border conditions. That the multiple produce by strong reflectionof seasurface has changed amplitude, frequency and phase of the effectivereflected wave, canbe seen after the compare of seismic simulatedindifferent border conditions . Thefiltering operators for attenuating multiple can be calculated bythe normalized method, and thenthey are worked onthe seismic with multiple . The compares betweenthe stacked seismic sections showthat the normalized filtering operators work well in attenuating the seismic multiple, andthe seismic resolutionisi mproved after process . Thereafter, according the conditions affecting the multiple, the method to calculate normalized filtering operator for real seismic acquired in shallow sea fields is presented. They can be calculated using seismic si mulated based on the simplified model of real conditions ,in which the sea water depth, the shots’depthand thereceivers’depth are morei mportant . Keywords multiple, normalization, wave equation, numerical si mulation, filtering operator
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第 2 2 卷 第1 期 地 球 物 理 学 进 展 Vol .22 No .12007 年2 月( 页码:200~206) PROGRESS IN GEOPHYSICS Feb . 2007
Study on multiple attenuation method based on match filterLI Jing- ye1 , 2 , CHEN Xiao- hong 3 , RUI Zhen- hua3
( 1 . Key Laboratory f or Hydrocarbon Accumulation Mechanism, Ministry of Educati on , Chi na PetroleumUniversity , Beijing 102249 , China ;2 . Basi n & Reservoir Research Center in Chi na Petroleum Uni versit y , Beiji ng 102249 , Chi na ;
3 . Key Lab of Geophysical Ex plor ati on of CNPC , China Pet role um Universit y , Bei ji ng 102249 , China)
Abstract The conventional filtering method can not work well in marine seis mic multiple attenuating for shallow wa-ter . Seis mic numerical simulation in different conditions was done by solving wave equation and changing the surfaceborder conditions . Seismic with multiple produced by strong reflection of sea surface can be modeled with free borderconditions , and seis mic without multiple can be modeled with absorbing border conditions . That the multiple produceby strong reflection of sea surface has changed amplitude , frequency and phase of the effective reflected wave , can beseen after the compare of seis mic simulated in different border conditions . The filtering operators for attenuating mul-tiple can be calculated by the normalized method , and then they are worked on the seis mic with multiple . The com-pares bet weenthe stacked seis mic sections show that the nor malized filtering operators work well in attenuating theseis mic multiple , and the seis mic resolution is i mproved after process . Thereafter , according the conditions affectingthe multiple , the method to calculate nor malized filtering operator for real seismic acquired in shallow sea fields ispresented . They can be calculated using seis mic si mulated based on the simplified model of real conditions , in whichthe sea water depth , the shots’depth and the receivers’depth are more i mportant .Keywords multiple , nor malization , wave equation , numerical si mulation , filtering operator