波动方程叠前深度偏移技术及其应用

Wave equation pre-stack depth migration technology and application

简要介绍了波动方程叠前深度偏移技术的发展趋势,讨论了P道集波动方程速度分析技术,推导出了共方位角波动方程叠前深度偏移方法的计算公式。利用上述技术和方法,借助国产神威I型机,完成了埕北地区130km2三维地震资料的叠前深度偏移,实现了共方位角波动方程偏移算子的并行运算,并行效率达到了线性加速。偏移结果表明,此方法能有效改善地震数据的成象精度,适用于构造复杂地区。

This paper briefly introduces the developing trend of wave equation pre-stack depth migra-tion technology, discuses p-gather wave equation velocity analysis technology, and educes the calculate formula ofcommon-azimuth wave equation pre-stack depth migration method. 130 square kilometers pre-stack depth migrationof 3D seismic data from Chengbei Area has been processed by the method, with domestic No 1 Shenwei super comput-er, and realized the parallel arithmetic of operator of common-azimuth wave equation pre-stack depth migration, itsparallel efficiency reached linearity acceleration. The migrated results show that the image precision of seismic datacan be effectively improved by this method, especially suitable for complex structural area.