覆盖密度对叠前偏移成像效果的影响  

Influence of Seismic Coverage Density on Prestack Migration Imaging Effect

作　　者：彭晓 李献民 夏建军 王正军 杨万祥 李见 

机构地区：[1]中国石油东方地球物理公司新疆物探处,乌鲁木齐830016

出　　处：《新疆石油地质》2014年第1期105-108,共4页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05019-004)

摘　　要：常规稀疏三维地震,由于线距大导致覆盖密度不足,理论分析和实际采集实例,当炮点距和道距基本满足空间采样定理时,应充分重视炮线距和检波线距方向的空间采样密度。减小炮线距和检波线距提高覆盖密度,可扩大三维空间带宽,达到提高叠前偏移成像精度的目的,同时叠前偏移道集以及成像数据体信噪比也可得到明显改善。In conventional sparse 3D seismic acquisition,the large line interval leads to poor seismic coverage density.The theoretical analysis and seismic acquisition examples demonstrate that when the shooting distance and the trace-to-trace interval basically meet the spatial sampling theorem,we should pay full attention to the spatial sampling density in direction of shooting line spacing and geophone line spacing.Reducing such two spacings to improve the coverage density can expand 3D space bandwidth and achieve the aim of enhancing the prestack migration imaging accuracy,allowing the prestack migration trace gathers and the signal-to-noise ratio of imaging data to be significantly improved.

关 键 词：覆盖密度 叠前偏移成像 信噪比 成像分辨率 

分 类 号：P631.443.4[天文地球—地质矿产勘探]