Prestack reverse-time depth migration of arbitrarily wide-angle wave equations
HE Bing-shou ZHANG Hui-xing ZHANG Jing Marine Geo-science College,Ocean University of China,Qingdao 266100,China
Based on arbitrarily wide-angle wave equations,a reverse-time propagation scheme is developed by substituting the partial derivatives of depth and time with central differences. The partial derivative of horizontal direction is replaced with high order difference. The imaging condition is computed by solving the eikonal equations. On the basis of above techniques,a prestack reverse-time depth migration algorithm is developed. The processing exam-ples of synthetic data show that the method can remove unwanted internal reflections and decrease the migration noise. The method also has the advantage of fidelity and is applicable of dip angle reflector imaging.