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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。
3D prestack depth migration is a powerful tool for the study of complex structure imaging. The parallel efficiency of large-scale parallel processors lays the foundation for 3D prestack depth migration in short period. Three-dimensional prestack depth migration mainly includes three parts: travel time calculation, Kirchhoff summation, velocity analysis. Using the depth-shifted gathers to level off the velocity analysis, the velocity model can be further modified. The advantages of 3D prestack depth migration and migration velocity analysis are demonstrated for the actual data processing in eastern China. The hazards of complex structural imaging and trap analysis using time migration are illustrated. The 3D prestack depth migration reduces drilling risk .