Studies On Pre-Stack Time Migration And Its Apllication

In the process of seism data, migration is one of the foremost means , its purpose to make wave field image come back true image of geologic object in the earth. Pre-stack migration is availability means to make complex conformation become nicety of image. When the conformation is very complexity in the earth and velocity vary acute in line, foundation of post-stack of time migration is difficult to make complex conformation become nicety of image. Pre-stack of deep migration is the best means of four migration in complex conformation in theory, but it is demand velocity precision too strict to make velocity model satisfy it, it restrict pre-stack of deep migration become popular. Compare to pre-stack of deep migration, pre-stack of time migration demand velocity precision is not too much. In complex conformation and velocity vary not too much area, pre-stack of time migration could make complex conformation become nicety of image. Pre-stack of time migration is more important method in practicality. Pre-stack of time migration is become rapid group up in recently several years, it is already become routine method in the process of seism data, replace of tradition post-stack of time migration.Pre-stack of migration in the process of seism data is considered what is the relation of explode and recever, it is should from CMP to CDP of aim stratum. It is consider from CMP in the ground attribute to reflect overlay of aim stratum, it assure efficacious overlay of aim stratum distributing uniformity. By way of practice analyse shot gather trace chart, shoud from straight ray to bend ray in theory.