借助广义Radon变换进行方位角校正

Azimuth correction with the aid of the generalized Radon transform

中国科学院计算数学与科学工程计算研究所, 北京100080

Institute of Computational Mathematies and Scientific/Engineering Computing, The Chinese Academy of Sciences, Binjing 100080

在三维勘探中,除界面倾斜角外,方位角是另一个必须在预处理中加以考虑的因素。本文借助于广义Radon变换,构造了一种有效的三维数据中的方位角修正方法,它将消除三维共面元道集中叠加速度对方位角的依赖关系,从而使在一个三维共面元道集中,来自不同方向的反射同相轴可以用同一个速度进行叠加。本文利用数值模拟数据和从物理模型中测量的数据分别验证了所提出的算法。

Apart from the dip angle problems in a 3-D dipping re floction cvent, the azimuth is anotheraspect that has to be taken into account in 3-D preprocessing. With the aid of the generalizedRedon transform, an effcient and convinent method for corrccting the azimuths within a 3-Deommon cell gather is proposed in this papcr. It can remove the effect of the azimuth on thestacking velocity, so that the reflection events contributing to the same ce1l from diffcrent sourcereceiver directions can be aligned with the samc velocity. This method is illustrated with cxamplesof both synthetie data as well as watertank model data.