| 几种相对振幅保持的叠前偏移方法对比分析 |
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| 引用本文： | 张丽艳,刘洋,陈小宏.几种相对振幅保持的叠前偏移方法对比分析[J].地球物理学进展,2008,23(3):852-858. |
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| 作者姓名： | 张丽艳 刘洋 陈小宏 |
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| 作者单位： | 中国石油大学CNPC物探重点实验室,北京,102249 |
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| 基金项目： | 中国石油天然气集团公司资助项目 |
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| 摘 要： | 本文首先介绍了几种振幅保持的叠前偏移方法,通过对这几种方法进行对比分析可以看出每种方法所考虑的影响因素不同,所以它们的加权函数不同.第一类加权函数没有考虑焦散和孔径的影响;第二类加权函数考虑了焦散的影响,但是没有考虑孔径的影响,第三类加权函数既考虑了焦散的影响又考虑了孔径的影响,而第四类加权函数是从波动方程出发,通过分解上、下行波场,根据成像条件来求取加权函数的.然后通过模型验证了共炮检距保幅偏移方法的有效性,从而说明了保幅偏移对振幅的补偿作用.最后考虑了偏移孔径与权函数的关系,它们之间主要通过连续窗函数μ(ξ,sξt)来控制,这样才能有效地消除偏移过程中所产生的噪声.
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| 关 键 词： | 振幅保持 叠前偏移 权函数 偏移孔径 |
| 收稿时间： | 2008-1-25 |
| 修稿时间： | 2008-3-14 |
Comparative analysis of several relative amplitude-preserving prestack migration methods |
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| ZHANG Li-yan,LIU Yang,CHEN Xiao-hong.Comparative analysis of several relative amplitude-preserving prestack migration methods[J].Progress in Geophysics,2008,23(3):852-858. |
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| Authors: | ZHANG Li-yan LIU Yang CHEN Xiao-hong |
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| Institution: | (CNPCKeyLabofGeophysicalExploration,ChinaUniversityofPetroleum,Beijing102249) |
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| Abstract: | This article firstly summarizes several amplitude-preserving prestack migration methods.As they consider different affecting factors they use different weight functions.The first weight function does not consider the affection of the migration aperture and caustic.The second function only considers caustic.The third weight function considers not only aperture but also caustic.The fourth weight function is based on wave equation.It is derived according to the imaging condition by decomposing upgoing wavefield and downgoing wavefield.Then the validity of amplitude-preserving migration is proved by the model,which shows the compensation effect of amplitude-preserving migration on the amplitude.Finally the relationship between the migration aperture and weight functions are discussed.It is mainly controlled by a continuous taper function to remove noise effectively during migration. |
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| Keywords: | amplitude-preserving prestack migration weight function migration aperture |
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