海上地震勘探外源干扰快速压制方法
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摘要
外源信号与地震震源信号没有明显的地球物理特征差异,其频谱与有效信号频谱完全重叠,同时外源信号的反射同相轴符合地震时距曲线规律,因此用滤波等常规噪声压制方法无法压制外源干扰。本文提出一种外源干扰快速压制算法,利用外源干扰的时距曲线和正常时差可以得到外源干扰的信号源位置,再利用时距曲线模拟出任意位置处的干扰模型,以此校正炮集记录,拉平外源干扰。最后,应用LIFT去噪方法分离有效信号与外源干扰。LIFT去噪方法在信号模型建立和数据重构过程中提取估算剩余信号,能够获得更好的信噪比和信号保持。这种海上外源快速压制算法简便、高效,通过对实际三维地震资料进行处理,证实了该方法的有效性。
The geophysical differences between outsource perturbation and seismic source signal are quite small.The spectrum rang of outsource perturbation is the same with that of effective signal,and the reflection events of outsource perturbation conform to time-distance curve.Therefore,it is hard to suppress outsource perturbation by using traditional noise suppression technology such as filtering.Outsource perturbation of the rapid suppression technology was put forward in this paper.The perturbation source can be estimated according to the equation of time-distance curve and normal move.Then,noise model of everywhere can be simulated with time-distance curve,the shot gather record can be corrected,and outsource perturbation will be leveled off.In the end,the effective signal and the outsource perturbation will be separated by using Leading Intelligence Filter Technology.Residual signal will be estimated in the process of signal modeling and data reconstruction in LIFT de-noise method.Therefore,the signal to noise ratio will be high and it is more superior to the effective signal reservation.It is convenient and efficient to suppress outsource perturbation in offshore seismic data by this method.When it comes to 3-D practical seismic data,this method is proved to be effective.
The geophysical differences between outsource perturbation and seismic source signal are quite small.The spectrum rang of outsource perturbation is the same with that of effective signal,and the reflection events of outsource perturbation conform to time-distance curve.Therefore,it is hard to suppress outsource perturbation by using traditional noise suppression technology such as filtering.Outsource perturbation of the rapid suppression technology was put forward in this paper.The perturbation source can be estimated according to the equation of time-distance curve and normal move.Then,noise model of everywhere can be simulated with time-distance curve,the shot gather record can be corrected,and outsource perturbation will be leveled off.In the end,the effective signal and the outsource perturbation will be separated by using Leading Intelligence Filter Technology.Residual signal will be estimated in the process of signal modeling and data reconstruction in LIFT de-noise method.Therefore,the signal to noise ratio will be high and it is more superior to the effective signal reservation.It is convenient and efficient to suppress outsource perturbation in offshore seismic data by this method.When it comes to 3-D practical seismic data,this method is proved to be effective.
引文
[1]郭建卿,张保庆,赵贻水,等.墨西哥湾海洋地震数据处理案例分析[J].石油地球物理勘探,2007,42(增刊):132～135.
[2]Choo J,Sudhakar V.A new processing technique to LIFT noise and multiple[R].CSEG and Canadian Society of Petroleum Geologists Joint National Con-vention,Calgary,2003.
[3]李来林,魏大力.LIFT去噪方法在地震资料处理中的应用[J].石油物探,2007,46(2):193～195.
[2]Choo J,Sudhakar V.A new processing technique to LIFT noise and multiple[R].CSEG and Canadian Society of Petroleum Geologists Joint National Con-vention,Calgary,2003.
[3]李来林,魏大力.LIFT去噪方法在地震资料处理中的应用[J].石油物探,2007,46(2):193～195.
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