By seismic migration, the complexity of seismic wave field in imaging domain is reduced, and the difference between signal and noise characteristics becoming larger, which is convenient for purification processing. The S/N ratio of seismic data after de-noising, demultiplex and regularization in imaging domain is greatly improved, and then it is converted back to data domain for subsequent processing through reverse migration.
Through migration/reverse migration, the effective reflection energy on seismic gather is strengthened, convenient for interpreting velocity spectrum and stack imaging.
偏移反偏移处理后提高道集信噪比，提高速度分析的可靠性
Through the stack section processed by migration/reverse migration, the original weak signals in middle and deep strata was significantly strengthened, which provides a solid foundation for subsequent study.
The common reflection bin stacking (CRS) technology extends the seismic reflection signal from a reflection point to a reflection surface, which is a leap in seismic processing technology. It can significantly improve the imaging quality of PSTM and PSDM by increasing fold number, improving seismic reflection illumination, and signal-to-noise ratio.
By CRS stacking technology, the effective signal on a single shot record is strengthened greatly, laying a solid foundation for improving S/N ratio of seismic data.
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CRS处理前后道集对比（CDP5000） | CRS处理前后道集对比（CDP8000） |
The following figure shows the comparison of pre-stack time migration results before and after CRS processing. The S/N ratio of the original processing results in deeper zone is low, existing a lot of blank reflections; In results processed by CRS, the deep effective signal in deeper zone is enhanced and the S/N ratio is greatly improved.
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