Wave-equation based Q tomography from angle-domain common image gathers

Abstract

To produce a reliable Q model, we present a new method for wave-equation migration Q analysis in angle-domain common image gathers. We develop two ways of choosing the reference images for the objective function: one using the near angles of each angle gather and one using the near angles of the reference angle gather. We apply our methods to two 2D synthetic tests. The results show that the inverted Q anomalies are well retrieved. Compared with Q analysis from the stacked image, Q estimation using pre-stack gathers can obtain a higher resolution result. In addition, Q estimation from pre-stack gathers mitigates the side lobe problems that arise in the stacked gather.