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引言在许多探区,浅层通常具有很强的非均匀性。这种非均匀性能够产生散射面波。当这些散射波掩盖住了来自地下深部的体波反射时就会降低地震数据的质量。靠近接收线散射的面波(纵测线方向的散射波)可用通用的滤波技术加以消除(Yilmaz,1987)。但远离接收线散射的面波(横测线方向散射波)却是滤波所无法完全消除的,因为这些波类似于体波反射。在以前的论文中,我们已经用模拟数据(Blonk和Herman,1994)和野外数据(Blonk等,1995)探讨过消除散射面波的反向散射法。目前,我们把注意力集中在质点速度的垂向分量上,这就意味着面波和体波反射可以根据相应的相位速度差异加以识别。
INTRODUCTION In many exploration zones, the shallow layers usually have strong inhomogeneities. This inhomogeneity can produce scattered surface waves. When these scattered waves obscure the reflection of body waves from deep underground, the quality of the seismic data is reduced. Surface waves scattered near the receive line (scattered waves in the inline direction) can be removed using common filtering techniques (Yilmaz, 1987). However, the surface waves scattered away from the receiving line (scattered waves in the transverse direction) can not be completely eliminated by the filtering, because these waves are similar to the reflection of bulk waves. In previous papers, we have explored the backscattering method that eliminates scattered surface waves using simulation data (Blonk and Herman, 1994) and field data (Blonk et al., 1995). At present, we focus on the vertical component of the particle velocity, which means that the surface wave and the body wave reflection can be identified according to the corresponding phase velocity differences.