如何高质量、快速完成叠前时间偏移是一个非常困难的课题。
Therefore, this paper introduces a method of prestack time migration in dealing with such a mass of data.
由于无需对不同百分比速度模型重复计算旅行时，多次叠前时间偏移所耗费CPU时间并不多。
The consumed CPU time of the multiple migration is not too much, because multiple travel-time calculations for the different percentages of the velocity model are unnecessary.
叠前时间偏移是一项理论与经验紧密结合的应用技术，处理过程中每一环节均会对成像产生影响。
Prestack time migration processing is an application technology of combination of theory and experience. Each stage will have an impact on migration imaging.
结果表明：叠前时间偏移技术能够有效地提高构造复杂地区煤层的成像效果，提高煤田地震资料的信噪比和分辨率。
The results demonstrated that this technology can improve imaging of coal seams in structure complicated areas and coalfield seismic data signal-to-noise performance and resolution effectively.
对比分析了叠前深度偏移、叠后时间偏移和叠前时间偏移结果，分析表明，叠前深度偏移技术能较好地改善该区复杂构造的成像质量，提高资料的信噪比和分辨率。
Analysis of the results suggest that poststack depth migration has more advantages in improving S/N ratio, resolution and image effect than poststack time migration and prestack time migration.
叠前逆时偏移需要计算成像点的初至时间。
Prestack reverse time migration requires computing the first breaks time of imaging points.
叠前逆时偏移需要计算成像点的初至时间。
Prestack reverse time migration requires computing the first breaks time of imaging points.
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