Elastic Gaussian Beam Migration for 4C Ocean Bottom Seismic Data

Three component (3C) elastic Gaussian beam migration is attractive for its efficiency, flexibility, and accuracy. However, when it is used for ocean bottom seismic data, the incomplete boundary condition will yield some nonphysical artifacts. To solve this problem, we extend our proposed elastic Gaussian beam migration from 3C to 4C by using the pressure wave which is 4th component to represent the stress tensor on the ocean bottom. When applying a decomposition matrix to 4C data during imaging, different wave modes are seperated and the receiver-ghost is removed simultaneously. Additionally, angle-domain common-image gathers (ADCIGs), which can be utilized for migration velocity analysis and the joint PP & PS AVA inversion, are generated during the migration. A synthetic experiment validates the method for a 4C ocean bottom data migration.