Application of Iterative Least-Squares Migration in Different Geological Settings

Least-squares migration has over the last few years become the new standard in high-end seismic imaging. In this paper we utilize iterative least-squares migration in different geological settings from shallow complex structures to deeper sub-chalk and sub-salt targets. We evaluate how least-squares migration can improve the wavenumber content, suppress illumination effects from acquisition design and velocity anomalies and reveal finer structural detail compared to conventional migration. By utilizing the one-way extrapolators, the inversions can be done for the full frequency range supported by the data at an acceptable cost.