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上覆薄层对目的层反射响应有很大的影响,它可产生速度各向异性以及散射衰减引起的传播损失。在进行目的反射层成像和反射系数反演时,必须考虑这些影响。用等效介质理论来描述一套薄层中标量波(即声波或SH波)的传播可得出一个简单的一般O’Doherty-Anstey公式。该公式用几个取决于上覆反射层一维随机波动的统计参数来定义,它可与众所周知的针对目的层和保幅偏移/反演算法,以及AVO分析法综合应用。我们用弹性薄层介质中的SH波来说明该综合法的应用。结果表明,在补偿薄层对地震反射旅行时和振幅的影响方面,它是一种合适的方法 因此,目的反射层的薄层灵敏AVO参数(零偏振幅和AVO梯度)可得到更好的恢复。
The overlying layer has a significant effect on the reflection response of the target layer, which can produce velocity anisotropy and propagation losses due to scattering attenuation. These effects must be taken into consideration when imaging the target reflector and retrieving the reflection coefficient. Using equivalent medium theory to describe the propagation of a set of scalar waves (ie, sonic or SH waves) in a thin layer yields a simple general O’Doherty-Anstey equation. The formula is defined with several statistical parameters that depend on one-dimensional random fluctuations of the overlying reflector, which can be used in combination with the well-known target-oriented and amplitude preserving migration / inversion algorithms, as well as the AVO analysis. We use the SH wave in the elastic thin layer medium to illustrate the application of the synthesis method. The results show that it is a suitable method for compensating the effect of thin layers on the seismic reflection travel and amplitude and thus the thin layer sensitive AVO parameters (zero-offset amplitude and AVO gradient) of the target reflection layer can be better recovered .