Abstract：The double focusing method is a new method for special-target-oriented 3-D geometry-optimined design,which can quantitatively predict the spatial resolution,the precision of amplitude and the AVP character of seismic imaging.The ordinary analysis of CMP bin attribution is macro and overall,which emphasizes on obtaining the optimal horizontal stacking effects;but the analysis of double focusing character is special target-oriented and regional,which emphasizes on obtaining the optimal precision of migrated imaging.Therefore,combination of the two methods can complement each other and improve the effects of geometry-optimized design.Because of different media model having big difference in double focusing computation,the study of the task needs to be carried out in three steps:algorithm in homogeneous media,algorithm in layered media and algorithm in complex media.The paper finished the first step,that is the study of double focusing algorithm in homogeneous media and the development of corresponding software,which is as a supplement of 3D geometry-optimized design as a supplementary method.
