三维VSP波动方程保幅叠前深度偏移方法  

Amplitude-preserved Wave Equation Prestack Depth Migration in 3D VSP Data

作　　者：沈铭成[1] 李录明[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室(成都理工大学),成都理工大学"地球探测与信息技术"教育部重点实验室,成都610059

出　　处：《科学技术与工程》2013年第30期8995-8999,共5页Science Technology and Engineering

基　　金：国家自然科学基金(41204091);教育部博士点新教师基金(20105122120001);教育部优先发展领域基金(2011512230001)资助

摘　　要：VSP偏移成像技术在VSP资料处理中具有重要意义。为了对地下复杂构造进行精确成像,常要求对VSP数据进行三维叠前偏移处理。传统的单程波方程延拓计算时只能保证相位信息的正确性,没有对振幅做任何处理,存在保幅性较差的问题,不利于将其结果运用到岩性分析中去。以保幅型单程波偏移算子为基础,研究了三维VSP单程波动方程保幅偏移成像方法。并在实际资料中,采用了保幅型三维地震道插值方法,对非规则网格炮点采集的三维VSP数据进行插值,保证了波动方程保幅偏移的效果。Traditional 3D-VSP one-way wave equation migration methods have characteristics of high accuracy and high computational efficiency,but its poor amplitude-preserved capbility is still problem.With the introduction of three-dimensional amplitude-preserved one-way wave migration operator,prestack depth migration in 3 D-VSP data is finished,the accuracy of imaging results in the amplitude is improved.So that the imaging results could be more conducive to lithology analysis.In actual data processing,amplitude-preserved seismic trace interpolation method is used also in irregular grid arrangement shot points data,this problem is solved when we do 3 D-VSP migration in common receiver point stacks.Theoretical models and actual data processing results verificated the correctness and validity.

关 键 词：三维VSP 波动方程 叠前偏移 保幅偏移 共接收点道集 

分 类 号：P631.443[天文地球—地质矿产勘探]