两步法预测反褶积在压制变周期鸣震中的应用

Using two-step predictive deconvolution to suppress variable period reverbertions

在滩浅海地区,由海底地形起伏引起的变周期鸣震是影响资料品质的主要干扰因素,已有的压制海底(?)震的方法,或多或少存在着一些不足,不能达到完全消除资料上鸣震干扰的目的。为此,提出了两步法预测反褶积。该方法分别从共炮点域和共检波点域对海底鸣震进行压制,可以有效地消除鸣震对资料的影响。讨论了变周期鸣震的形成机制,论述了两步法预测反褶积压制变周期海底鸣震的方法原理,在山东半岛北部渤海海域进行了方法验证。结果表明,利用两步法预测反褶积可以很好地压制变周期鸣震干扰,突出有效反射,提高资料的品质。

In neritic area,the variable period reverberation caused by seabed terrain fluctuation is the main disturbance factor to the seis- mic data quality.The existing methods of suppressing seabed re- verberation had some deficiencies more or less and so they cannot completely eliminate the reverberation interference.Therefore,the two-step predictive deconvolution method is proposed,which sup- presses the seabed reverberations in common shot point domain and common receiving domain respectively,eliminating the noise effec- tively.The forming mechanism of variable period reverberation is discussed and the principles of the method are elaborated,The method is verified at Bobai sea area in the north of Shandong Penin- sula.The results confirmed that the two-step predictive deconvolu- tion method can effectively suppress the variable period reverbera- tion,highlight the valid reflections,and improve the data quality.