三维合成炮叠前深度偏移

3-D synthesized-shot prestack depth migration

中国科学院数学与系统科学研究院计算数学与科学工程计算研究所,北京100080

Academy of Mathematics and System Sciences, Institute of Computational Mathematics and Sciences/Engineering Computing, Chinese Academy of Sciences, Beijing 100080, China

对国际上标准的SEG/EAEG模型进行了三维合成炮叠前偏移研究。与三维单炮叠前深度偏移不同, 三维合成炮叠前偏移有一个叠前数据的合成过程, 由于合成后数据量大大减少, 所以合成炮偏移的计算量要比单炮偏移小得多。阐述了三维合成炮叠前偏移的实现过程, 给出了相应公式。对SEG/EAEG盐丘模型的一个数据集进行了MPI并行计算, 取得了良好的成像效果。所作的较多计算表明了三维合成炮叠前偏移的正确性和有效性, 这为野外实际数据的三维叠前深度偏移提供了另一条有效途径。

3-D synthesized-shot prestack depth migration on the international standard SEG/EAEG model was investigated. Being different from 3-D single-shot prestack depth migration, the 3-D synthesized-shot prestack depth migration involves a data synthesizing process on the prestack data. The computational cost of the synthesized-shot migration is much less than that of the single-shot migration due to the great reduction of the data volume by synthesizing process. This paper described the implementing procedure and relevant formulae of the 3-D prestack depth migration. Numerical MPI calculations for one data set of the SEG/EAEG model yielded desired imaging results. More completed calculations have shown the correctivenenss and effectiveness of the 3-D synthesized-shot prestack migration method. The new method provides an alternative for 3-D prestack depth migration.