Abstract：Practical methods for 2-D wave equation prestack depth migration are being further developed and completed.The paper only compared four representative methods,that is Split-Step Fourier(SSF),Fourier Finite-Difference(FFD),Ueneralized Screen Propagators(GSP) and Finite-Difference in Space-Frequency Domain(XWFD).All these methods have the following thinking:the velocity field is split into background field and disturbed field,the wavefield continuation of background field is completed by phase-shift method and migrated imaging of disturbed field is fulfilled by different methods,so each method has his own characters.The paper tested and analyzed the pulse responses corresponding to four methods and migrated imaging processing was carried out by using Marmousi model and real seismic data separately at the same time,the calculated results are more ideal.The comparison of the results in these wave equation migration methods with those by Kirchhoff method is also carried out.The analyses showed the former is superior to the latter in resolution and imaging capacity for weak signal.
