Imaging Salt/sediment Interfaces with Three-component VSP data, Using Ray-based Interferometry-like Processes

Summary We describe two interferometry-like processes that can be used to create quasi-3D images of formation details around a well. Like with proper interferometry, the new methods allow large travel time errors accumulated over the up-to more than 50,000 ft travel path from the source to the receiver to be effectively cancelled, making the images only dependent on local velocities. In principle, the local velocities can be extracted from the data themselves, making the processes self-contained.