College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China

Remigration is an imaging method that maps migrated image fields of different migration velocity fields to each other.It is mainly used for migration velocity analysis,wave mode transformation,and data regularization.Theoretically,this kind of mapping can be realized by differential operator,or by integral operator.Compared between the two,the integral operator achieves higher computational efficiency and has more adaptability to the irregularity of the input data.Given the fact,the authors worked out the depth domain remigration method based on the Kirchhoff integral theory with the basic theory and workflow of the Kirchhoff remigration.The calculation results on the gradient model and Marmousi model verify the effectiveness of this method.In addition,numerical experiments show that integral method is faster than the differential method.