Research on suppressing free surface multiples based on Marchenko theory

被引：0
|
作者：
Wang X. [1 ]
Wang X. [1 ]
Xie J. [1 ]
Zeng H. [1 ]
Zhao Y. [1 ]
机构：
[1] Northwest Branch of Exploration and Development Research Institute of CNPC, Lanzhou
来源：
Acta Geophysica Sinica | 2021年 / 64卷 / 05期
关键词：
Focus function; Green function field; Marchenko; Surface-related multiple;
D O I：
10.6038/cjg2021O0040
中图分类号：
学科分类号：
摘要：
The conventional multiple prediction method based on virtual source position Marchenko autofocusing is only applicable to the multiple models without free surface and is limited to the suppression of interlayer multiples. This method must remove all surface-related multiples from the reflection response before retrieving the up and downgoing Green's function fields. This work improved the Marchenko equation to compute up and downgoing Green's function, and obtained the Green's function including primaries, internal multiples, and surface-related multiples. The modified Marchenko autofocusing prediction method can predict surface-related multiples. Using a horizontally layered model data and model data with dip, it was proved that the modified Marchenko method can yield relatively ideal results in prediction of surface-related multiples and interlayer multiples of seafloor, and avoids the defect that the conventional SRME surface-related multiple attenuation method needs a near route to reconstruct, thus can effectively improve the signal-to-noise ratio and resolution of seismic data. © 2021, Science Press. All right reserved.
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页码：1683 / 1689
页数：6
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