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波动方程叠前深度偏移是解决复杂构造成像问题的有效手段。偏移速度分析和AVA/AVO分析都需要在共成像点道集完成,而共成像点道集对偏移速度的敏感性又直接决定了偏移速度分析的可行性,也影响到偏移速度迭代收敛的次数。利用双平方根保幅偏移算子,在波场延拓过程中抽取共成像点道集,保持了振幅的能量特征,有利于AVA/AVO分析。偏移距域和射线参数域共成像点道集对偏移速度较敏感,能够满足偏移速度分析的需要,两者联合应用有利于提高偏移速度分析的精度。
Wave equation prestack depth migration is an effective method to solve the problem of complex structure imaging. Offset velocity analysis and AVA / AVO analysis need to be completed in the common imaging point gathers, and the sensitivity of common imaging gathers to offset velocity directly determines the feasibility of migration velocity analysis and also affects the migration velocity The number of iterations converge. Using double square root amplitude preserver migration operator, the common imaging point gathers are extracted during the wave field continuation, and the energy characteristics of the amplitude are maintained, which is in favor of AVA / AVO analysis. The common imaging point gathers of offset and ray parameters are sensitive to migration velocity, which can meet the need of migration velocity analysis. The combination of the two can improve the accuracy of migration velocity analysis.