Migration velocity analysis is one of the key steps in pre stack depth migration whose accuracy directly affects the quality of pre stack depth migration.
偏移速度分析是叠前深度偏移的关键步骤之一，它的准确与否直接影响叠前深度偏移的质量。
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Remarkable achievements were obtained in the research, development and application of three dimensional seismic exploration and its depth migration before stack technique as well as software system.