改进衰减边界在TI介质正演模拟中的应用

Application of Improved Damping Boundary Condition in TI Media Forward Simulation

对边界的处理是正演模拟中很重要的部分,对各向异性介质来说,由于方程更复杂,独立弹性参数更多,所以边界处理也更为复杂。针对传统的衰减边界条件,对其衰减因子进行改进,在同样宽度的衰减带情况下效果更好,并应用到复杂的各向异性介质正演模拟中。通过数值模拟试验证明改进的衰减边界实施简单,在较薄的衰减带内能够较好的消除人工边界反射。

Boundary processing was very important in forward modeling.For anisotropic media,wave equation was more complex,independent elastic parameters would be more,therefore the anisotropic media modeling boundary conditions were more difficult to be handled with.In allusion to the traditional damping boundary condition,its damping factors are improved and the boundary condition obtained can be used in complex anisotropic media modeling.The test demonstrates that the improved damping boundary condition can eliminate the most of the artificial reflections in thin damping zones.