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利用有限元和反时外推算法,在过去的二年中,我们发展了弹性波叠前有限元反时偏移方法;并对有偏移距的合成数据进行了偏移。作为对在过去二年中所写的文章的姐妹篇,本文给出了实际数据的弹性波有限元反时偏移结果。 本文所使用的实际数据是具有两个分量的共炮点(CSP)道集。偏移中所使用的速度V_p和V_a是由均方根(RMS)速度分析和Dix公式确定的。偏移前对实际数据进行了预处理。在偏移深度剖面上,偏移成像较好地勾划出反射点。而且,将水平与垂直分量偏移剖面结合起来的“调整场”偏移深度剖面,由于消除了各自分量的偏移剖面上的背景噪音,显示出更加清晰的像。
Using finite element and anti-time extrapolation algorithms, in the past two years we developed an elastic wave prestack finite element anti-time migration method, and offsetted the synthetic data offset. As a sister piece to the articles written over the past two years, this article presents the results of an elastic wave inverse finite element migration of real data. The actual data used here is a common shot point (CSP) gathers with two components. The velocities V_p and V_a used in the offset are determined by root mean square (RMS) velocity analysis and the Dix equation. The actual data is pre-processed before offsetting. At the offset depth profile, the offset image better delineates the reflection point. Moreover, the “adjusted field” offset depth profiles, which combine the horizontal and vertical component offset profiles, show sharper images due to the elimination of background noise on the offset profiles of the respective components.