基于格林函数的层间多次波预测

doi:10.11720/wtyht.2022.1618

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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.

Key words： interbed multiple SRME Green's function surface-related multiple

Received: 25 December 2021 Published: 03 January 2023

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	Articles by authors
	Qiang XU
	Shuang XU
	Wei WANG
	Hai-Kun WANG

Cite this article:

Qiang XU,Shuang XU,Wei WANG, et al. Prediction of interbed multiples based on the Green's function[J]. Geophysical and Geochemical Exploration, 2022, 46(6): 1512-1517.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1618 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I6/1512

Interlayer multiples propagation diagram

Forward velocity model

Forward shot before and after interlayer multiple suppression
a—forward shot record;b—after suppressing interlayer multiples;c—predicted multiple model

Forward stackbefore and after interlayer multiple suppression
a—forward stack record;b—after suppressing interlayer multiples;c—difference of subtraction between fig. a and fig. b

Comparison of multiple prediction models using different layer velocities

Shot before and after interlayer multiple suppression
a—original shot record;b—after interlayer multiple suppression;c—interlayer multiple prediction mode

Comparison of stack before and after multiple suppression of marine seismic data
a—original stack section;b—stack after the attenuation of interlayer multiples

Autocorrelation of stack section before and after multiple suppression
a—autocorrelation of original stack section;b—stack profile autocorrelation after interlayer multiples suppression

Velocity spectrum of stack section before and after multiple suppression
a—raw data velocity spectrum;b—velocity spectrum after interlayer multiples suppression

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