当前位置: X-MOL 学术Explor. Geophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Reproduction wavefield reverse time migration
Exploration Geophysics ( IF 0.9 ) Pub Date : 2021-03-22 , DOI: 10.1080/08123985.2021.1903810
Dawoon Lee 1 , Wookeen Chung 1 , Woohyun Son 2 , Young Seo Kim 3
Affiliation  

The reverse time migration (RTM) aims to image subsurface reflectors by incorporating with the two-way wave equation. RTM has advantages that it does not have dip limitations and can generate subsurface images clearly even in the case of complex geological structures in the near surface. We have proposed a reproduction wavefield reverse time migration (RWRTM) algorithm implemented with backward reproduced wavefield instead of the back-propagation of the observed data. Reproduced wavefield can be achieved by using the same modelling algorithm used in the source propagation. In general acquisition systems, e.g. streamer in marine or surface geophone in land, conventional RTM back-propagates data acquired on the top grid points in the numerical domain while RWRTM back-propagates reproduced data located on all grid points in the numerical domain, which lead to the generation of migration images with less migration noises and well-balanced migrated events. To validate RWRTM, numerical tests are conducted. For our examples, RWRTM images have better resolution, improved continuity of structure, reduced migration noises, and balanced amplitude compared to the conventional RTM.



中文翻译:

再现波场逆时偏移

逆时偏移 (RTM) 旨在通过结合双向波动方程对地下反射器进行成像。RTM的优点是没有倾角限制,即使在近地表复杂地质结构的情况下也能清晰地生成地下图像。我们提出了一种再现波场逆时偏移 (RWRTM) 算法,该算法使用反向再现波场而不是观测数据的反向传播来实现。再现波场可以通过使用与源传播中使用的相同建模算法来实现。在一般采集系统中,例如海洋中的拖缆或陆地中的地面检波器,传统的 RTM 反向传播在数值域中的顶部网格点上获取的数据,而 RWRTM 反向传播位于数值域中的所有网格点上的再现数据,这导致生成具有较少迁移噪声和良好平衡的迁移事件的迁移图像。为了验证 RWRTM,进行了数值测试。对于我们的示例,与传统 RTM 相比,RWRTM 图像具有更好的分辨率、改进的结构连续性、减少的迁移噪声和平衡的幅度。

更新日期:2021-03-22
down
wechat
bug