Application Of Pre-stack Depth Migration Processing Technique In F Area

With the further of oil and gas exploration and development to the complex structure area,pre-stack time migration imaging is often not accurate in the underground structure,and pre-stack depth migration is an effective technical means to solve accurate imaging of complex structure.At present,the most widely used in production of pre-stack depth migration is the Kirchhoff integral method.This method follow the Snell's law of wave propagation,with high deviation Angle,no dispersion,occupy less resources,and computing the efficiency high characteristic.It can adapt to the irregular sampling observation system.The key of pre-stack depth migration is the high quality of the common middle point gathers and the precise velocity volume.Based on a large number of theories,this paper obtains a set of perfect pre-stack depth migration process through experimental research.It aims to solve the problem of fracture and small fault imaging in the eastern boundary,improve the contact relation of the target layer and improve the imaging effect of the base.First of all,we introduce the principle of depth migration technique of Kirchhoff integral method,and analysis advantages and disadvantages.Give the corresponding solution to improve the imaging precision.Secondly,the key link of pre-stack depth migration velocity model and optimize the depth domain research,analysis and comparison of different initial interval velocity model building method,put forward the ideas and the application layer to determine the initial structural position tomography method,the principle of optimal velocity model.Finally,according to the data characteristics of the research area,reasonable treatment scheme and process are adopted to ensure the quality of the common center point.Pre-stack depth migration has the ability of the complex structure imaging,its core is to establish the accurate velocity model,through the migration velocity analysis and tomographic imaging method,iterative optimal velocity model can make the pre-stack depth migration good focus imaging.The pre-stack time migration is to solve the imaging problem when the tilted strata exist,and the pre-stack depth migration is to accurately image the complex structure of the transverse velocity changes.In this study,the pre-stack depth migration of Kirchhoff in F region was studied,and the treatment effect was significantly improved compared with that of the old data,and the processing process was worthy of application and promotion.