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3D偏移常用交替方向隐格式来实现 ,即将 3D平方根算子沿相互垂直的 2个方向分裂 ,这会导致明显的方位各向异性误差 (分裂误差 ) ,将算子沿多方向分裂是消除这种误差的有效手段。根据螺旋变换的思想 ,采用 4方向分裂法 ,用频率域差分法和混合法进行了三维叠后深度偏移 ,其优点是避免了不同方向求解时由于非矩形区域而带来的编程复杂性 ,明显消除了分裂误差 ,数值算例验证了该方法的正确性 ,且该方法具有较好的一般性和适用性。
3D offset commonly used alternating direction implicit format to achieve, the 3D square root operator perpendicular to the two directions along the split, which will lead to significant azimuthal anisotropy error (split error), the operator is divided in many directions to eliminate this Effective means of error. According to the idea of helical transformation, the 4-direction splitting method is adopted, and the 3-D poststack depth migration is carried out by using the frequency-domain difference method and the hybrid method. The advantage of this method is that it avoids the programming complexity caused by non-rectangular areas in different directions, The splitting error is obviously eliminated. The numerical example verifies the correctness of the method, and the method has good generality and applicability.