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 reverberations

（1.中国石油化工集团胜利石油管理局物探公司，山东东营 257100； 2.上海赛因软件开发有限责任公司，上海 200092）

Geophysical Prospecting Company, Shengli Oilfield, SINOPEC, Dongying 257100, China

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，已有的压制海底鸣震的方法，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 seismic data quality. The existing methods of suppressing seabed reverberation 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 suppresses the seabed reverberations in common shot point domain and common receiving domain respectively, eliminating the noise effectively. The forming mechanism of variable period reverberation is discussed and the principles of the method are elaborated. The method is verified at Bohai sea area in the north of Shandong Peninsula. The results confirmed that the two-step predictive deconvolution method can effectively suppress the variable period reverberation, highlight the valid reflections, and improve the data quality.