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陈生昌 ,曹景忠 ,马在田 .基于 Rytov近似的叠前深度偏移方法 .石油地球物理勘探 ,2 0 0 1,36 (6 ) :6 90～ 6 97本文在频率—波数域和频率—空间域实现了一种基于 Rytov近似的叠前深度偏移方法 ,并在二维空间作了 Marmousi模型炮集数据的处理。通过与 Split- Step Fourier和 Phase- Screen等叠前深度偏移方法的比较 ,我们认为基于 Rytov近似的叠前深度偏移方法不仅在效果上优于前两者 ,而且还能更好地处理速度横向变化。在散射波场的计算中 ,我们使用了一个比 Huang L等 (1999) [3 ] 的方法更稳定的散射波场计算公式 ,扩大了 Rytov近似的应用范围 ,使基于 Rytov近似的叠前深度偏移方法能够适应更剧烈的横向速度变化。
Chen Shengchang, Cao Jingzhong, Ma Zaitian. Prestack Depth Migration Method Based on Rytov Approximation. Petroleum Geophysical Prospecting, 2 0 0 1, 36 (6): 6 90 ~ 6 97 In this paper, the frequency-wavenumber domain and frequency- A prestack depth migration method based on Rytov approximation is proposed and the Marmousi model shot data is processed in two dimensions. By comparing with the prestack depth migration methods such as Split-Step Fourier and Phase-Screen, we think that the prestack depth migration method based on Rytov approximation is not only better than the former two in terms of effect, but also can better handle the speed Lateral changes. In the calculation of scattering wavefield, we use a more stable scattering wavefield calculation formula than the method of Huang L et al. (1999) [3], expanding the application range of Rytov approximation, making the prestack depth bias based on Rytov approximation Shifting method to adapt to more dramatic changes in lateral velocity.