摘要
针对常规Born近似傅氏偏移方法对于剧烈横向变速介质不能精确成像的状况而提出了变参考慢度Born近似傅氏偏移,理论上解决了任意速度变化地质模型的偏移成像问题。此外,为进一步提高复杂地层的成像精度和波场延拓算子的稳定性,对散射波场的计算公式作了改进。将改进的方法运用于盐丘模型的正演和偏移试验,并与常规Born近似偏移方法相比较,可明显看出变参考慢度Born近似傅氏偏移方法在效果上要优于后者,其处理速度横向变化的能力大大增强。
Due to situation that conventional Born approximation Fourier migration method can not image accurately the media with acute lateral variation of velocity,this paper puts forward variational reference slowness Born approximation Fourier migration method. It can theoretically solve the migration image problem of arbitrary velocity change model. In addition,in order to raise the image accuracy of complex layer and the stability of wavefield extrapolation formula, the scattered wavefield formula is improved. After applying this method to the forward modeling and migration of salt dame model, a better result than the conventional Born approximation migration method can be got. The ability of dealing with lateral velocity variation is greatly increased.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2003年第4期555-558,共4页
Journal of Jilin University：Earth Science Edition
基金
国家973项目资助(G1999043311)
关键词
Born近似
散射波场
速度横向变化
波场延拓
GREEN函数
变参考慢度
傅氏偏移
地震勘探
migration
Born approximation
scattered wavefield
lateral variation of velocity
wavefield extrapolation
Green function
variational reference slowness
