炮记录SSF叠前时间偏移  

SSF prestack time migration in shot record

作　　者：王有新[1] 葛大明[1] 孙朋朋[1] 王磊[1] 孙瑞艳[1] 张达[1] WANG You-xin;GE Da-ming;SUN Peng-peng;WANG Lei;SUN Rui-yan;ZHANG Da(Geophysical Research Institute of Shengli Oilfield Branch Co., Dongying Shandong 257022, China)

机构地区：[1]胜利油田分公司物探研究院,山东东营257022

出　　处：《油气地球物理》2016年第3期1-6,共6页Petroleum Geophysics

摘　　要：偏移算法按照类型分为射线法和波场法,在实际处理中,叠前时间偏移主要使用射线法,而叠前深度偏移则经常使用射线法和波场法。射线法计算量小,能够适应纵横向速度变化,但是一般认为其振幅特性不如波场法。理论上,波场递推算法均可应用于叠前时间偏移,而要求引用层速度则限制了实际应用。借用SSF算法,将逐步递推改为单步外推,从而允许引用均方根速度,通过时间单步外推满足速度纵向变化,通过空间相对时移适应速度横向变化,成为具有实用价值的波场法叠前时间偏移方法。Migration algorithm might be divided into 2 categories: wave-based type and ray-based type. Ray-type isused in both PSTM and PSDM, and wave-type is merely adopted in PSDM in processing. Generally, ray method iscapable of velocity variation in time and space with less computation, but it is hard to reach an optimum amplitudeperformance. In theory, wave-field extrapolation could be used in PSTM, but it is rejected by layer velocityrequirement. Based on SSF algorithm, RMS velocity is introduced by replacing step by step downwardcontinuation with one step extrapolation, time variation is realized by vertical step at each time, and spacevariation is possible by lateral residual time shifting, PSTM could be implemented by wave field extrapolation inpractice.

关 键 词：叠前时间偏移 SSF 算法 炮记录偏移 

分 类 号：P631.4[天文地球—地质矿产勘探]