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炮域波动方程叠前深度偏移是一种实用化的成像算法,特别在稀疏炮集宽方位角观测系统采集的数据成像中非常有效。本文将偏移距定义为叠前偏移中下行震源波场和上行接收点波场之间的位移,在偏移过程中提取偏移距域共成像点道集,利用最早应用于炮—检偏移的径向记录道映射方法,将偏移距域道集转换到角度域。计算过程包括多偏移距成像和炮—检点坐标系向中心点坐标系的转换。该方法能够在炮集偏移过程中生成随角度变化的反射波成像结果,但在稀疏炮集观测系统下,共成像道集的质量仍会受到炮点假频的影响。
Gunfield wave equation Prestack depth migration is a practical imaging algorithm that is particularly effective in the data acquisition of sparse gun azimuth observing systems. In this paper, the offset is defined as the displacement between the down-going source wave field and the up-going receiving point wave field in the prestack migration. At the offsetting time, the common imaging point gathers are extracted, Offset radial track mapping method to convert offset domain gathers to angle domain. The calculation process includes multi-offset imaging and conversion of the gun-checkpoint coordinate system to the center point coordinate system. This method can generate reflected wave imaging results with angle variation during shot offset, but the quality of co-shot gathers will still be affected by shot aliasing in the case of sparse shot acquisition system.