Plane-wave least square reverse time migration for rugged topography

Least-squares reverse time migration with and without source wavelet estimation

“…The primary problems are the great computation cost and memory requirement. Fortunately, many methods, e.g., source-encoding method (Dai et al, 2012Zhang et al, 2013;, plane-wave method Li et al, 2014) and boundary-wavefield extrapolation method (Tan and Huang, 2014b;, have been developed to solve these two problems. In addition, the preconditioning (Dai et al, 2011;Liu et al, 2013) and regularization (Xue et al, 2016) methods are usually utilized to accelerate the convergence rate of LSRTM, by which the iteration numbers can be efficiently reduced.…”