用于地震面波分离的倾角中值滤波法
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摘要
针对西部地区受近地表低降速带影响、反射地震资料中浅层面波干扰严重和野外采集资料信噪比低的情况,根据面波的特性,基于中值滤波法,提出一种用于地震面波分离的倾角中值滤波法。该方法利用面波的线性特征和反射波的非线性特征对面波分离,达到增强反射波的目的。理论模型和实际资料应用结果表明:该方法能够在叠前有效分离面波,提高资料的信噪比、分辨率,满足浅层高分辨资料处理的需求。
This paper is an effort to address low noise-signal ratio occurring in seismic data acquisition due to the influence of near-surface low velocity zone in western areas and more disturbance of surface wave in shallow seismic data.The paper proposes the dip median filtering method designed for the separation of seismic surface wave,depending on surface wave features and median filtering method.This method works by separating surface wave using the linear feature of surface wave and the non-linear feature of reflected wave and thus strengthening reflected wave.The theoretical model and practical data application show that the method,capable of effectively separating surface wave before prestacking and improving noise-signal ratio and resolution ratio of data,could fulfill the need of shallow high resolution data processing.
This paper is an effort to address low noise-signal ratio occurring in seismic data acquisition due to the influence of near-surface low velocity zone in western areas and more disturbance of surface wave in shallow seismic data.The paper proposes the dip median filtering method designed for the separation of seismic surface wave,depending on surface wave features and median filtering method.This method works by separating surface wave using the linear feature of surface wave and the non-linear feature of reflected wave and thus strengthening reflected wave.The theoretical model and practical data application show that the method,capable of effectively separating surface wave before prestacking and improving noise-signal ratio and resolution ratio of data,could fulfill the need of shallow high resolution data processing.
引文
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[8]何樵登.地震勘探原理和方法[M].北京:地质出版社,1985.
[2]张华,潘冬明,张兴岩.二维小波变换在去除面波干扰中应用[J].石油物探,2007,46(2):147-150.
[3]桂丽华.基追踪在面波分离与压制中的应用[D].成都:西南交通大学,2010.
[4]谢金伟.浅层反射资料降噪技术研究[D].长沙:中南大学,2011.
[5]胡光瑞,郑志航,戚飞虎.二维数字信号处理Ⅱ[M].北京:科学出版社,1985.
[6]李承楚.关于中值滤波的理论基础[J].石油地球物理勘探,1986,21(4):372-379.
[7]聂爱兰.叠前地震信号多线束倾角中值滤波方法[D].西安:长安大学,2005.
[8]何樵登.地震勘探原理和方法[M].北京:地质出版社,1985.
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