Seismic Prestack Time Migration Processing Method Application Research

Migration isone of the important processing means of seismic exploration,and its purposeis to make underground reflection wave events homeaccurately. As the exploration structurebecoming more and more complex, exploration accuracy requirements are also increasing. Buttheconventional post-stack migration processing can not meet the requirements for imaging.The pre-stack time migration processing technology has achieved better results in the migrationimaging and with the rapid development of computer, the technology has been widely used.First of all, the paper systematically reviews the concept, basic principle, classification anddevelopment process of migration, focusing on the analysis of the concepts and principles ofpre-stack time migration and post-stack time migration.Thus lay a solid theoretical foundationfor subsequent analysis model testing.Secondly this paper brieflyintroduce the basic concepts and main module of the coreprocessing software (CGG processing software). According to the characteristics of thegeological structure, by constructing the corresponding geological model, the simulationcalculation of the seismic record forward and using the CGG processing software for processinganalysis. Systematically analyze the pre-stack time migration parameter selection, theestablishment of the velocity field and the key technologies of software.Summed up that thepre-stack time migration has the effect of improving the seismic data imaging of the steep dipregion, enhancing the quality of seismic data processing, accurately ascertain the complexstructure of the underground.Finally, do the analysis of pre-stack time migration and conventional migration to the2Dseismic data. Coming to the fact that relative to the conventional post-stack migration, the pre-stack time migration technology has special advantages and more extensive applicationprospects.Pre-stack time migration avoid the limitation of over-simplistic medium model, and it isnot very strict to the requirement of speedat the same time, which is more suited to the currentseismic processing.Currently the pre-stack time migration processing has seen significant effectin practical application, and I believe that with the popularization and application of practicalproduction, the technology will be constantly improvedand play a huge role in seismicprocessing.