面向目标控制照明的合成波源偏移

The migration of synthetic waves for target-oriented controlled illumination

1. 同济大学海洋与地球科学学院暨地质教育部重点实验室,上海 200092;2. 加州大学圣克鲁兹分校模拟和成像实验室暨地球物理与行星物理研究所,美国加州 CA 95064

Key Lab of Marine Geology under the Ministry of Education, School of Ocean and Earth Science, Tongji University, Shanghai 200092, China

应用Fourier有限差分算子,研究目标控制照明的合成波源偏移成像。平面波源与小束波源这些合成波源在目标控制照明下的偏移,都是通过增强对目标区域的有效照明来改善成像质量,通过减少非目标区域的计算冗余来提高计算效率。由分析和应用合成平面波源偏移和控制照明技术扩展开去,综合考虑平面波源和小束波源的合成与偏移,并通过有效照射合成波源的概念,分析合成波源的有利照明,进行面向目标区域的控制照明和合成波源偏移。最后,对具有速度强横向变化和陡倾角反射的复杂2D盐丘模型数据,做了相应的合成波源偏移数值试验。

Wave equation-based Fourier propagator or FFDoperator,which can provide refined image, is used in the migration of synthetic wayes for target-orientedillumination. Synthetic seismic waves including planewaves and beam waves. Target-oriented controlled il-lumination migration with synthetic waves achieveshigh quality images by enhancing the effective illumi-nation of the targets and improves computation effi-ciency by decreasing the computation at non-targetedareas. In this paper, we compared the two kinds ofsynthetic seismic wave migration approaches. The i-dea of efficient illumination is applied to direct the il-lumination analysis and migration. Synthetic seismicwave migration is tested on a complex 2-D salt modelwith strong lateral velocity variations and steep dip-ping reflectors.