Abstract：Prestack depth migration by controlled illumination is a fast and geologic-target-oriented migration technique.It can improve the image quality of the targets by controlling the directional characteristics of incident source wavefields at the targets.We proposed a method for surface controlled illuurination of multi-geologic targets,which directed to complex media, appropriately selected multiple targets and controlled the source wavefields illumination of multiple targets at the same time to obtaro the fine image of structures at the multi-targets.The Marmousi model was used for numerical computation of the method and the results were used to compare with that migrated from the method for surface controlled illumination of single-target and with the migrated results of conventional shot gathers and plane wave as well.The resuits showed that prestack depth migration by illuurination of multi-geologic targets not only can greatly improved the imaging quality in multi-targets area,but also has higher computational effort for ordinary migration in shot domain.
