Zhang Hongjing1,2, Zhou Hui1,2, Chen Hanming1,2, Lin He1,2, Wang Jie1,2
1. State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;
2. CNPC Key Laboratory of Geophysical Prospecting,China University of Petroleum(Beijing),Beijing 102249,China
Abstract:To attenuate artificial edge reflections arising at truncation boundary,stable and effective absorbing boundary conditions(ABC) should be applied in seismic numerical simulation.In this paper,we use a high accurate one-way wave equation,named arbitrarily wide-angle wave equation(AWWE),as ABC in second-order acoustic wave equation simulation.We give out the corresponding discrete formulation of the boundary condition using the finite-difference method.Meanwhile,the corner regions are carefully treated.The numerical simulations of a homogeneous medium and 2D Marmousi model show that AWWE boundary condition can adapt to a wide range of incident angle and has a better absorption effect than second-order paraxial approximations(CE2 in short).The computation efficiency of the AWWE boundary condition is almostidentical to CE2.In addition,such an ABC has noinfluence to the interior stability.