文档介绍：APPLIED GEOPHYSICS, , (June 2010), P. 185 - 192, 11 Figures.
DOI: -010-0243-3
Analysis plicated structure seismic wave fi elds*
Zhou Hui1♦, Wang Shang-Xu1, Li Guo-Fa1, and Shen Jin-Song1
Abstract: In western China seismic wave fi elds are plicated and have low signal
to noise ratio. In this paper, we focus plex wave fi eld research by forward modeling
and indicate that density should not be ignored in wave field simulation if the subsurface
physical properties are quite different. We use the acoustic wave equation with density in the
staggered fi nite-difference method to simulate the wave fi elds. For this purpose plicated
geologic structural model with rugged surfaces, near-surface low-velocity layers, and high-
velocity outcropping layers was designed. Based on the instantaneous wave fi eld distribution,
we analyzed the mechanism plex wave fields. The influence of low velocity
layers on the wave fi eld is very strong. A strong waveguide occurs between the top and base
of a low velocity layer, producing multiples which rate into the earth and form strong
complex wave fi elds in addition to refl ections from subsurface interfaces. For verifying the
correctness of the simulated wave fields, prestack depth migration was performed using
different algorithms from the forward modeling. The structure revealed by the stacked