一种考虑噪声干扰的地表风化层Q值反演方法

Weathered-layer Q-value inversion method with consideration of noise

风化层对地震波的吸收十分强烈，补偿风化层对地震波的吸收，可以提高地震记录的分辨率。反演风化层的品质因数Q是补偿吸收作用的重要一步。现今有很多反演Q值的方法，但各种方法求出的Q值的可靠性均与信噪比有关。当记录信噪比较低时，没有任何一种现行方法能求出可靠的Q值。本文提出一种考虑噪声干扰近地表风化层的Q值反演方法，并用理论记录和实际记录作了实验，得到了较好的效果。

Weathered layer absorbs seismic waves greatly. Compensation for the absorption due to weathered layer can improve resolution of seismic data. The inversion ofquality factor Q of weathered layer is an important step in absorption compensation. There are many Q-value inversion methods; but the reliability of the Q valuesestimated by the methods is related to seismic signal/noise ratio. None of the methods can offer reliable Q value in the case of low seismic signal/noise ratio. Hence wedevelop a new weathered-layer Q-value inversion method that considers noise. Thetrial results of real and theoretical data show good effect.