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基于几何级数展开的鬼波压制方法*
引用本文:陈宝书,吴玉,陶杰,管西竹,刘春城,符力耘.基于几何级数展开的鬼波压制方法*[J].应用声学,2020,39(1):29-35.
作者姓名:陈宝书  吴玉  陶杰  管西竹  刘春城  符力耘
作者单位:中海油研究总院有限责任公司,中国科学院地质与地球物理研究所,中海油研究总院有限责任公司,中海油研究总院有限责任公司,中海油研究总院有限责任公司,中国石油大学华东
基金项目:国家科技重大专项(2016ZX05026-001-002)资助
摘    要:海上拖缆地震数据采集,检波器位于海平面以下,由于海平面的反射作用,检波器接收到的除了上行的一次波,还包括下行的鬼波,因为一次波和鬼波的干涉作用,导致地震信号的有效频带变窄,分辨率降低。为了恢复信号的有效频带,需要进行鬼波压制的宽频处理。该文提出了一种基于逆鬼波算子几何级数展开的鬼波压制技术。几何级数的每一项都是一个波场传播算子,级数的叠加可以实现鬼波的压制,通过对几何级数的截断,可以得到只含上行波的反射信号。数值算例证明了该文方法的有效性,因为波场延拓算子在频率波数域进行,借助快速傅里叶变换,该文方法的效率很高。

关 键 词:地震鬼波压制  逆鬼波算子  几何级数  频率波数域
收稿时间:2019/9/19 0:00:00
修稿时间:2019/12/25 0:00:00

Seismic deghosting based on geometric series expansion
CHEN Baoshu,WU Yu,TAO Jie,GUAN Xizhu,LIU Chuncheng and FU Liyun.Seismic deghosting based on geometric series expansion[J].Applied Acoustics,2020,39(1):29-35.
Authors:CHEN Baoshu  WU Yu  TAO Jie  GUAN Xizhu  LIU Chuncheng and FU Liyun
Institution:CNOOC Research Institute Co. Ltd,Institute of geology and geophysics, Chinese Academy of Sciences,CNOOC Research Institute Co. Ltd,CNOOC Research Institute Co. Ltd,CNOOC Research Institute Co. Ltd,China University of Petroleum (East China)
Abstract:Deghosting is a longstanding problem in marine seismic processing. Due to the presence of the free-surface, the interference between up- and down-going wavefields are present in the recorded data, resulting in notches in the amplitude spectrum of the recorded data. This leads to a reduction of the useful frequency bandwidth and therefore damages seismic resolution. It is desirable to remove the ghost events from the recorded data to gain broader bandwidth data. In this paper, we propose a deghosting method based on the geometric series approximation of the inverse ghost operator. Each item of the geometric series can be viewed as wave field propagation operator. The superposition of this series can achieve ghost suppression. By truncating the geometric progression, a reflected signal containing only the upward wave can be obtained. Numerical examples demonstrate the effectiveness of the proposed method. Because we can perform wavefield extrapolation in the FK domain. This method is also efficient by the use of FFT
Keywords:seismic  deghosting  inverse ghost operator  geometric series  FK domain
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