A separation method of up-going and down-going wavefields for dual-sensor seismic data

被引：0
|
作者：
Gao S.-W. [1 ]
Qian Z. [1 ]
Sun P. [1 ]
Fang Y. [1 ]
Li J. [1 ]
Ma G. [1 ]
机构：
[1] Geophysical Research & Development Center, BGP, CNPC, Zhuozhou, 072750, Hebei
来源：
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | 2020年 / 55卷 / 05期
关键词：
Dual-sensor seismic data; Energy matching factor; Separation contribution factor; Signal-to-noise ratio; Up-going and down-going wavefields; Wavefield separation;
D O I：
10.13810/j.cnki.issn.1000-7210.2020.05.007
中图分类号：
学科分类号：
摘要：
The separation of the up-going and down-going wavefields is a key step in the data processing of dual-sensor seismic data.Aiming at the dis-advantage that the up-going wavefield separated by conventional methods contains the down-going wavefield, and the down-going wavefield contains the down-going wavefield, that is, the up-going and the down-going wavefields can not be separated completely, this paper introduces three energy matching factors and four wavefield separation contribution factors.Three energy matching factors are the energy matching factor of dual-sensor data, the up-going wavefield energy matching factor of the down-going wavefield, and the down-going wavefield energy matching factor of the up-going wavefield.Four wavefield separation contribution factors are the up-going wavefield contribution factor of the hydrophone data, down-going wavefield contribution factor of the hydrophone data, the up-going wavefield contribution factor of geophone data, and down-going wavefield contribution factor of the geophone data.The up-going and down-going wavefield separation equations are established.The optimal energy matching factors of the up-going and down-going wavefields of dual-sensor seismic data are computed and determined by an iteration algorithm.Then the wave field separation contribution factors are directly calculated to realize the complete separation of the up-going from down-going wavefields of dual-sensor seismic data.The separated up-going wavefield data not only eliminates the ghost multiple interferences, but also widens the effective frequency band.The signal-to-noise ratio and resolution of the seismic data are improved too, and the high-fidelity up-going and down-going wavefields are provided for subsequent joint deconvolution and migration imaging processing.The effectiveness and practicability of this method are illustrated by synthetic and real data examples. © 2020, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：991 / 996
页数：5
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