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传统的单程波动方程偏移算法对大倾角成像困难,本文基于时空域任意广角单程声波方程,通过对时间变量进行傅立叶变换得到其频率-空间域形式,利用有限差分进行离散化,设计并实现了频率-空间域有限差分叠后偏移成像算法。模型试算表明,该方法能够通过参数优化使得低阶数算子适应较大倾角地层的偏移成像。
The traditional one-way wave equation migration algorithm is difficult for imaging with large dip angle. Based on the arbitrary wide-angle one-way acoustic wave equation in time-space domain, the frequency-space domain is obtained by Fourier transform of the time variable and discretized by finite difference. Finite difference poststack migration imaging algorithm in frequency - space domain. The experimental results show that the proposed method can adapt the low-order operator to the migration imaging of larger dip strata through parameter optimization.