基于逆散射级数法的鬼波压制方法  

Deghosting method based on inverse scattering series

作　　者：王芳芳[1,2] 李景叶[1,2] 陈小宏[1,2] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学CNPC物探重点实验室,北京102249

出　　处：《地球物理学报》2013年第5期1628-1636,共9页Chinese Journal of Geophysics

基　　金：国家科技重大专项课题(2011ZX05023-005-005);国家自然科学基金项目(41074098)联合资助

摘　　要：鬼波问题是影响海上地震资料分辨率和保真度提高的最重要因素之一.详细论述了逆散射级数理论和逆散射级数法鬼波压制原理,说明了逆散射级数方法进行鬼波压制理论的完善性和对鬼波描述的精确性.实现了基于逆散射级数理论的鬼波压制方法,方法以波动方程和Lippmann-Schwinger方程为基础,在频率-波数-波数域内构造与鬼波相关的压制算子,在不需要对地下介质作任何假设条件下实现地震数据驱动鬼波压制,并通过改善消除鬼波的压制算子,提高算法的稳定性.资料处理试验与处理结果分析表明,基于逆散射级数鬼波压制方法能在实现鬼波压制的同时较好保留有效反射波的信息,从而补偿地震资料低频损失和提高地震数据的保真度.数据处理试验还表明,研究方法能对低信噪比的地震资料进行有效的鬼波压制处理.建立了基于逆散射级数鬼波压制处理流程.Deghosting is one of the most important factors for enhancing resolution and higher fidelity in marine seismic exploration.Inverse scattering theory and a deghosting method based on that theory are deeply discussed.This method based on inverse scattering theory is perfect and exact for deghosting.The method based on wave equation and Born series directly removes ghosts in frequency-wavenumber-wavenumber domain and makes no assumptions about the earth.The method becomes more stable through improving deghosting operator.The method has been tested with simple synthetic data and Pluto model data and obtained positive and encouraging results.Testing to date has shown that this method can reserve primaries while deghosting and boost the low frequencies and enhance seismic fidelity.And testing also proves that this method works well for low S/N seismic data.And a deghosting flowchart is presented.

关 键 词：鬼波压制 逆散射级数 海上地震 信噪比 波动方程 

分 类 号：P631[天文地球—地质矿产勘探]