基于优化系数的有限差分叠前深度偏移方法  

Finite difference prestack depth migration based on optimal coefficient

作　　者：罗仁泽[1] 黄元溢[1] 闽超[1] 张玮[2] 傅丽容 高明 

机构地区：[1]油气藏地质及开发工程国家重点实验室,西南石油大学,四川成都610500 [2]塔里木油田库车勘探开发项目经理部,新疆库尔勒841000 [3]川庆钻探地球物理勘探公司,四川成都610225 [4]四川石化南充炼油厂,四川南充637000

出　　处：《石油地球物理勘探》2012年第3期399-403,354-355+518,共5页Oil Geophysical Prospecting

基　　金：油气藏地质及开发工程国家重点实验室(成都理工大学)开放基金资助项目(PLC201104);国家973计划专项经费(2011CB403002-5)

摘　　要：针对复杂陡倾构造及横向速度剧烈变化区地震资料的成像问题,本文提出了切比雪夫有理逼近优化系数有限差分叠前深度偏移方法.文中采用切比雪夫有理逼近求取有限差分频散方程的优化系数,进而改进有限差分叠前深度偏移方法,实现陡倾构造及横向速度变化剧烈地区地震资料的成像。通过对15°及45°方程与精确频散方程的相对误差的计算,以及对Marmousi模型进行偏移成像,证明在陡倾构造及横向速度变化剧烈的地区,应用切比雪夫有理逼近优化系数的有限差分叠前深度偏移方法具有更好的成像效果。To solve the problem of seismic data imaging in the areas with complex structure and strong lateral velocity variation,an improved finite difference prestack depth migration method with rational Chebyshev approximation optimal coefficient is proposed in this paper.Using novel rational Chebyshev approximation to optimize the coefficient of difference frequency dispersion equation,seismic data imaging in the areas with complex structure and strong lateral velocity variation are improved.The relative error between the 15° and 45° equation and precise frequency dispersion equation are calculated and Marmousi model is migrated and imaged.Both numerical simulation and field data show that this improved method obtains better seismic images in the areas with high dip structure and strong lateral velocity variation than those conventional methods.

关 键 词：优化系数 有限差分 叠前深度偏移 切比雪夫有理逼近 陡倾角 

分 类 号：P631[天文地球—地质矿产勘探]