Seismic Reflection Tomography with 3D RTM Angle Gathers

3D angle domain common image gathers (ADCIGs) from reverse time migration (RTM) provide accurate representation of residual moveout in complex media, especially in the presence of salt. Thus, tomography with residual moveout picked from RTM angle gathers allows us to build accurate models for seismic imaging. However, RTM angle gathers bring some challenges too. Among them are spatial under-sampling and insufficient angular sampling in deep parts of the image. In this paper, we present the approaches to overcome such problems and our complete work flow to build models with 3D RTM angle gathers.