【摘要】 相对于常规逆时偏移,多次波逆时偏移成像技术具有更高的成像精度。在分析多次波逆时偏移成像原理和条件的基础上,对多次波逆时偏移成像中的多次波预测、波场延拓等步骤的实现过程进行了研究。在此基础上,利用Sigsbee2B地质模型,应用基于反馈环理论的自由界面多次波衰减方法预测得到纯多次波炮集,实现了基于多卡GPU集群的多次波逆时偏移成像处理。处理结果显示,多次波逆时偏移的中浅层成像清晰,构造的成像精度明显高于常规逆时偏移。多卡GPU集群的应用可显著提高多次波逆时偏移的计算速度和效率,使得基于地震大数据体进行多次波逆时偏移成像处理成为可能。更多还原

【Abstract】 Compared to the conventional reverse time migration(RTM),RTM of multiples has a higher imaging precision.Based on the analysis of the imaging principle and conditions of RTM of multiples,the paper studied the steps of multiples prediction,wave field extrapolation and so on in the imaging process of RTM of multiples. Then,the shot gathers with only multiples were obtained by applying the surface-related multiples elimination method based on feedback loop theory to the Sigsbee2 B geological model,and the imaging processing of RTM of multiples was implemented based on the acceleration of multi-card GPU. The processing results show that the imaging result of the middle-shallow layer obtained by RTM of multiples is clear,and the imaging precision of shallow structures is obviously higher than that obtained by conventional RTM.Besides,the computational speed and efficiency can be improved significantly by the application of multi-card GPU,which makes it possible for the imaging processing of RTM of multiples based on big data.更多还原