检波点与震源能量比值在偏移成像条件中的作用分析

Applications of the receiver-source energy ratio in the imaging conditions

利用检波点能量与震源能量比值构造衰减系数,研究波场各频率成分在自相关与反褶积两类成像条件中偏移成像的作用.分析检波点能量与震源能量比值分布特征,有利于克服反褶积型成像条件中分母趋于零时计算不稳定现象,也有助于平滑检波点波场与震源波场;检波点能量与震源能量比值超出正常范围容易导致偏移结果中出现照明不均匀现象.本文方法有助于改善反褶积型成像条件的偏移计算,也有助于应用照明技术指导偏移成像结果的振幅校正.

This paper discusses the migration result of different frequency wavefields in both crosscorrelation and deconvolution imaging conditions by the construction of attenuation coefficients which are based on the receiver-source energy ratio.The distribution characteristics of the receiver-source energy ratio can be used to overcome the instability in the deconcolution imaging condition if the nominator approaches to zero,and smooth both the receiver and the source wavefields.If the receiver-source energy ratio exceeds a reasonable range,it will lead to illumination irregularity in the migration results.The ideas in this paper can be used to improve the migration processing,and to guide the illumination technology of making the amplitude correction in the migration results.