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A checkpoint-assisted interpolation algorithm of wave field reconstruction and prestack reverse time migration
Chen GuiTing1,2; Wang ZhenLi1
AbstractPre-stack reverse time migration and other geophysical methods based on wave field correlation principles have great computational and storage requirements, so it is very important to adopt appropriate wave field reconstruction methods capable of improving these two effects. Conventional reconstruction methods, such as the random boundary, is easy to produce imaging noise, and the effective boundary method is still difficult to work well in three-dimensional situations; the checkpoint method characteristically computes faster but has a high recalculation ratio. Therefore, this paper proposes a checkpoint-assisted interpolation algorithm to reconstruct the wavefield. In this method, the wavefield is sampled using the Nyquist sampling theory, making it possible to easily reconstruct the wavefield at any time which is reconstructed by polynomial interpolation between sampling wavefields, smartly handling the repetitive recursion that is a bane of computational efficiency. Numerical analysis shows that the interpolation algorithm can effectively reconstruct the wavefield and circumvent the problem of computational efficiency often caused by repeated recursion of the checkpoint technology. The experiments demonstrate that the accuracy of the cubic spline interpolation is quite high, and the Newton method is less computationally expensive and suitable for fast wavefield reconstruction. The feasibility of the interpolation algorithm is proved by the pre-stack reverse time migration of the Sigsbee model, resulting in a highly improved the computational efficiency of the wavefield reconstruction. Applying this method to a 3D model shows that the recomputation ratio of the interpolation reconstruction method is greatly reduced in the case of a small increase in storage. Compared with the efficient boundary condition method, the storage capacity is reduced by 7.1%, thereby making it a practically significant tool to achieve the 3D prestack reverse time migration.
KeywordPre-stack reverse time migration Wavefield reconstruction Recomputation ratio Interpolation algorithm Checkpointing technology
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000442058500020
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Document Type期刊论文
Corresponding AuthorWang ZhenLi
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Chen GuiTing,Wang ZhenLi. A checkpoint-assisted interpolation algorithm of wave field reconstruction and prestack reverse time migration[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(8):3334-3345.
APA Chen GuiTing,&Wang ZhenLi.(2018).A checkpoint-assisted interpolation algorithm of wave field reconstruction and prestack reverse time migration.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(8),3334-3345.
MLA Chen GuiTing,et al."A checkpoint-assisted interpolation algorithm of wave field reconstruction and prestack reverse time migration".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.8(2018):3334-3345.
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