variant velocity ray-tracing depth migration
...射线变速深度偏移 [gap=1415]igration; time-depth conversion by using the interval velocity as the parameter; variant velocity ray-tracing depth migration ..
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variant velocity ray-tracing depth migration
变速度射线追踪深度偏移
以上为机器翻译结果，长、整句建议使用 人工翻译 。