规则静态噪声的自适应去噪方法
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摘要
地震勘探测线经常要穿越工业区,不可避免地受到外界多种震源和50Hz工业电的影响,造成采集资料的大面积噪声干扰,这类干扰能量强、频带宽、且具有一定的规律性,需在叠前资料处理前有效去除。针对工业区的噪声干扰特点,提出了一种自适应零相位振幅滤波方法:即假定初至前噪声的频谱在信号区基本没有变化,据此估算出信号区噪声频谱n(ω),然后计算信号频谱s(ω),并将其反变换到时间域,从而达到去噪的目的。实例表明,去噪前后叠加剖面对应的频谱,其高频段弱信号能量明显得到提高。
Because of seismic prospecting lines will across industrial zones very often,thus impacts from outside multiple sources and 50Hz industrial currents are inescapable and caused acquired data have large area noise interference.These interferences have strong energy,wide wave band and certain regularity;need to be removed before prestack data processing.In allusion to industrial zone noise characters,put forward a kind of adaptive zero-phase amplitude filtering:that is assumed spectrum of noise before first arrive is basically no change in signaling zone.Hereby estimated signaling zone noise spectrum n(ω),then calculate signal spectrum s(ω),and inverse transform to time domain,thereby denoising is accomplished.Example has indicated that stacked section corresponding spectrum before and after denoising,high frequency sector weaker signal energy has been improved obviously.
Because of seismic prospecting lines will across industrial zones very often,thus impacts from outside multiple sources and 50Hz industrial currents are inescapable and caused acquired data have large area noise interference.These interferences have strong energy,wide wave band and certain regularity;need to be removed before prestack data processing.In allusion to industrial zone noise characters,put forward a kind of adaptive zero-phase amplitude filtering:that is assumed spectrum of noise before first arrive is basically no change in signaling zone.Hereby estimated signaling zone noise spectrum n(ω),then calculate signal spectrum s(ω),and inverse transform to time domain,thereby denoising is accomplished.Example has indicated that stacked section corresponding spectrum before and after denoising,high frequency sector weaker signal energy has been improved obviously.
引文
[1]美,渥.伊尔马滋.地震数据处理.
[2]张军华,吕宁,田连正,等.地震资料去噪方法技术综合评述[J].地球物理进展,2005,20(4).
[3]陈仲委,秦德中.自适应顺序统计滤波在地震资料处理中的应用[J].石油地球物理勘探,2006,41(3).
[2]张军华,吕宁,田连正,等.地震资料去噪方法技术综合评述[J].地球物理进展,2005,20(4).
[3]陈仲委,秦德中.自适应顺序统计滤波在地震资料处理中的应用[J].石油地球物理勘探,2006,41(3).
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