Prediction of interbed multiples based on the Green's function
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摘要: 对于海洋地震资料的多次波的预测通常会采用SRME(surface related multiple elimination)方法,但是对于地震资料中的强反射层之间形成的层间多次波,SRME方法则无法实现预测。本文基于惠更斯原理,利用采集接收到的已知地震波场通过格林函数的方法来推测在强反射层之间传播的层间多次波场。首先计算各接收点在强反射层之间传播的格林函数,将接收到的波场(即当前炮集的所有接收点接收到的原始地震数据)与格林函数褶积,将得到的结果相加作为当前接收点的层间多次波的模型。进而再从原始数据中利用自适应减法减去该多次波模型,这样便完成层间多次波的预测和衰减。通过模拟数据和实际数据测试,该方法能够较好地衰减层间多次波能量。Abstract: The surface-related multiple elimination (SRME) method is usually used to predict the multiples of marine seismic data.However,it cannot be used to predict the interbed multiples formed between strong reflection interfaces in seismic data.This study,based on the Huygens principle and the received known seismic wave fields,inferred the interbed multiples propagating between the strong reflection interfaces using Green's function.First,the Green's function propagating between the strong reflection interfaces at each receiver was calculated;then the obtained Green's function was convoluted with the received wave field(the original seismic data received by all receivers of the current shot gather);finally,the sum of the results was taken as the model of the interbed multiples of the current receiver.Subsequently,subtracting the multiple model from the original data through adaptive subtraction achieved the prediction and attenuation of interbed multiples.The tests based on simulation data and actual data indicate that the method proposed in this study can effectively attenuate interbed multiples.
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Key words:
- interbed multiple /
- SRME /
- Green's function
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