有限单元法弹性波偏移

本文在弹性动力学问题的有限单元解的基础上,提出了一种弹性波偏移的新方法--有限单元法弹性波偏移。本方法不仅能使反射纵波得到偏移,而且能同时对反射纵波和反射横波进行偏移。 用本方法已对一种层状模型成功地进行了检验。说明了它对反射纵波和转换横波同时向下延拓和偏移是稳定的,所得到的偏移结果是令人满意的。

FINITE ELEMENT ELASTIC WAVE MIGRATION

On the basis of the finite element solution to elasto dynamic problems, we propose a new method of finite element elastic wave migration. The finite element elastic wave migration takes advantage of its flexibility in finite element space discretization of complex geological and stratigraphic structures, including lateral inhomogeneity.The method has been successfully tested for a layered model. Downward continuation of both the reflected P and converted S simultaneously is stable. The wave forms of both the reflected wave P and the converted wave S are preserved. The results are satisfactory.