起伏地表条件下的弹性波叠前逆时偏移

目前，地震勘探条件复杂、地下地质构造多样的“双复杂”地区的地震勘探面临着诸多挑战，特别是地表起伏条件给地下复杂构造精确成像带来了困难。通过研究起伏地表条件下的弹性波叠前逆时偏移方法，采用简洁有效的处理方法解决起伏地表的自由边界条件；利用有效边界的边界存储策略解决弹性波叠前逆时偏移中存储量大的问题。数值实验结果证明该方法能够准确地重建震源波场，SEG加拿大起伏地表逆掩断层模型进一步验证了提出方法的有效性。

Elastic wave prestack reverse time migration on undulating surfac

At present, seismic exploration is facing many challenges in the "double complex" area, especially the undulating surface make it difficult to accurately image the underground complex structures. In this paper, we have studied the elastic wave prestack reverse time migration method for undulating surface, and a simple and effective treatment method was adopted to solve the free boundary conditions of undulating surface. In addition, the storage strategy of the effective boundary was used to solve the problem of big storage of elastic wave prestack reverse time migration. The numerical experimental results also show that this method can accurately reconstruct the source wave field. Finally, test of SEG Canadian overthrust fault model for undulating surface has further verified the effectiveness of the method proposed in this paper.