2D Imaging and Depth Tomography by Plane Wave Decomposition

Depth imaging and depth velocity analysis are performed in the variable angle domain. First the input is sorted into common receiver gathers. The gathers are converted into p gathers by a slant stack transformation. Migration is carried out by forming p sections and downward continuing each section separately. Velocity updating is done by grid tomography which detects nonflatness in the migrated p gathers and updates the velocity section accordingly.