High-Resolution Angle Gathers from Iterative Least-Squares Migration

Using wave-equation migration and demigration in the extended subsurface domain, we introduce a practical least-squares migration for the inversion of angle-domain common-image gathers. Through synthetic and field data examples, we demonstrate that least-squares migration provides high-resolution angle-domain common-image gathers with extended angle range, enhanced illumination, and balanced amplitudes. Similarly, the stacked images show better structural fidelity, improved resolution, balanced illumination, and reduced artifacts.