基于单程波动方程的曲面波裂步傅里叶叠前深度偏移  

Curved-wave SSF prestack depth migration based on one-way wave equation

作　　者：李慧杰[1] 陈秀梅[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《电子设计工程》2016年第9期72-75,共4页Electronic Design Engineering

摘　　要：波动方程叠前深度偏移方法是当前解决复杂地质构造并精确成像的最有效方法,但常规炮集叠前数据深度偏移涉及到巨大的波场外推计算量,计算效率偏低。这里将曲面波技术与裂步傅里叶算子(SSF)相结合,提出曲面波裂步傅里叶偏移方法。该方法通过构建适合波场理论的曲面波合成算子来合成曲面波数据,然后结合适用于炮域的裂步傅里叶波场延拓算子对曲面波波场进行延拓成像,其能够保证地下目标成像质量的同时进一步极大提高成像效率。应用复杂Marmousi模型成功验证了该方法的高效性和准确性。The wave equation prestack depth migration method plays an important role in resolving the problems about seismic imaging of complex geologic bodies in the laterally varying condition. However, conventional wave equation prestack migration based on common shot gathers needs to downward continuation for every trace sample of every shot which involves a huge wave field extrapolation. Here, curved-wave Split-step Fourier prestack migration was put forward by combining curved-wave technology and SSF continuation operator. Curved records and sources were generated by putting curved-wave synthesis operator constructed by defining curved-wave base kernel and a sequence of ray parameters into use, after applying Split-step Fourier continuation operator deduced in shots records to curved records and curved sources, migration imageing result can be achieved in curved-wave field. This kind of processing approach can ensure the quality of imaging of underground targets and further improve the imaging efficiency at the same time. At last, complex Marmousi model was tested to validate the correctness and high efficiency of this method.

关 键 词：单程波动方程 曲面波合成算子 裂步傅里叶 叠前深度偏移 

分 类 号：TP0[自动化与计算机技术]