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我们介绍一种地震反射数据的3-D保持振幅叠前深度偏移法(PAPsDM),它是以射线加Bom近似法为基础的。射线加Born反演方法使模型的摄动能够定量恢复。通过采用3-D非均匀平滑速度场的动态射线追踪和波前构成(WFC)方法来计算格林函数。PAPsDM在单个处理机5un SPARC20工作站上就可以实现。要特别注意CPU的效率和所需内存。我们把它应用于3-D实际海洋数据集(13G字节)。大约需要一周的CPU时间来完成7km×1km×1km的偏移图像。
We present a 3-D hold amplitude prestack depth migration (PAPsDM) method for seismic reflection data that is based on ray-plus-Bom approximations. The ray plus Born inversion method enables the model perturbation to recover quantitatively. The Green’s function is calculated by a dynamic ray tracing and wavefront composition (WFC) method using a 3-D inhomogeneous smooth velocity field. PAPsDM can be implemented on a single processor 5un SPARC20 workstation. Pay special attention to CPU efficiency and memory requirements. We apply it to the 3-D actual ocean data set (13G bytes). It takes about a week of CPU time to complete the offset image of 7 km × 1 km × 1 km.