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本文介绍一种改进的迭前偏移方法,它的整个步骤是: 首先形成一些恒炮检距迭加剖面,使得覆盖次数大大减少(例如从48次减至8次).其次根据选择的各个不同炮检距作速度场V(x,y,z)的转换,然后利用所有这些不同的速度场对各自对应的恒炮检距剖面进行偏移. 最后,再对那些经过偏移的不同恒炮检距迭加剖面进行迭加,这时需要重新估算最佳迭加速度。讨论基本原理后,我们给出一些实例,以证明我们提出的这种方法的有用价值。
This paper presents an improved prestack migration method, the entire steps of which are as follows: Firstly, some constant offset recording sections are formed to reduce the number of overlaps (for example, from 48 to 8) .Secondly, (X, y, z) for different offsets, and then offset each of the corresponding constant offset sections with all these different velocity fields. Finally, Offset superposition of the offset from the superposition, then need to re-estimate the optimal superposition speed. After discussing the rationale, we give some examples to prove the usefulness of the proposed method.