【摘要】 叠前偏移是解决强横向变速情况下复杂构造成像的一种有效手段,在碳酸盐岩成像处理研究中,利用波动方程叠前偏移较叠后偏移能获得分辨率高、保幅性好的偏移成果,孔洞能得到很好的刻画,串珠聚焦程度好,归位更加合理,能真实反映地下的构造形态,提高碳酸盐岩岩溶地形的地震预测成功率。对时间偏移和深度偏移在理论方法、适用性和处理剖面效果方面进行了分析对比,在地下构造复杂或横向速度变化较大时,叠前深度偏移能获得更好的效果。速度建模是影响叠前偏移成像技术的核心问题之一,获得准确的层速度是叠前深度偏移成功的关键。更多还原

【Abstract】 Prestack migration has been an effectively method in some areas with complicated structure and dramatic lateral variation in velocity.In comparison with the wave equation pre-stack migration method to post migration method,the pre-stack migration method in seismic imagery processing of fracture-cave in carbonate rock has ability to obtain high resolution and amplitude-preserved migration results,finely portray the fracture-cave,and highly draw a string of beads.The migration results can reflect real structure underground and enhance the success rate of seismic prediction in carbonate karst area.We compare the pre-stack time migration method with the pre-stack depth migration method in theory,applicability and processing seismic section,and find out that the pre-stack depth migration method can obtain the profitable result in some areas with complicated structure and dramatic lateral variation in velocity.Velocity modeling is an important technique in wave equation pre-stack depth migration,so an accurate interval velocity is a key for wave equation pre-stack depth migration.更多还原