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我们提出一种基于标量波动方程克希霍夫积分解的层置换方法。“层置换”一词,意指用下伏层速度去代替上盖层速度,从而消除上下两层界面上射线路径的弯曲.正是这种弯曲,才引起复杂构造下面反射波的失真和混乱。如果在叠前完成层置换,那么,就能在对因复杂上盖而引起的非双曲正常时差的 CMP 资料作校正后进一步修正速度估值。因此,层置换也产生一个更好的非偏移迭加剖面,再经过叠后时间偏移就能成像.我们用具有非规则水底地形的海上资料对这种层置换方法的有效性和简单计算过程作了证实和说明。
We propose a layer permutation method based on the scalar wave equation Kirchhoff integral solution. The term “layer displacement” means that the velocity of the underlying capping layer is replaced by the velocity of the underlying layer, thereby eliminating the bending of the ray paths at the interface between the upper and lower layers. It is this curvature that causes distortion and chaos in the reflected waves below the complex structure . If the layer replacement is done before the stack, then the velocity estimate can be further corrected after corrections to CMP data for non-hyperbolic normal jet lag due to complex caps. As a result, layer displacement also results in a better non-offset superposition profile that can then be imaged by a post-stack time migration We use the sea-based data for an irregular submarine topography to demonstrate the effectiveness and simplicity of this method The process was confirmed and explained.