大规模并行处理机三维叠前深度偏移

3-D prestack depth migration on massive parallel processing system

1. 中国地质大学, 北京 100083;2. 中国新星石油公司北京计算中心, 北京 100083

China University of Geosciences, Beijing 100083

三维叠前深度偏移是研究复杂构造成像的有力工具, 大规模并行处理机的并行效率为短周期完成三维叠前深度偏移奠定了基础。三维叠前深度偏移主要包括三个部分：旅行时计算、Kirchhoff求和、速度分析。利用深度偏移后的道集是否拉平进行速度分析, 可以进一步修改速度模型。对中国东部实际资料处理表明了三维叠前深度偏移和偏移速度分析的优点, 说明了用时间偏移进行复杂构造成像和圈闭分析的危害, 三维叠前深度偏移减小了钻井风险。

3-D prestack depth migration is a powerful tool for complicated structure imaging. The parallel effi-ciency of massive parallel processing system lays a foundation for fulfilling the 3-D prestack depth migra-tion within short time. The 3-D prestack depth migration principally includes three parts: travetime cal-culation, Kirchhoff summation, and velocity analysis. The velocity model can be further modified by ve-locity analysis in accordance with Whether the depth-migrated gather is datuming or not.The real data processing in eastern China area shows the merits of 3-D prestack depth migration andmigration velocity analysis, and the danger of performing complicated structure imaging and trap analysisby time migration is explained. In brief, the 3-D prestack depth migration reduces the drilling risk.