三维VSP波动方程保幅叠前深度偏移方法
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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 3D-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 3D-VSP migration in common receiver point stacks.Theoretical models and actual data processing results verificated the correctness and validity.
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 3D-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 3D-VSP migration in common receiver point stacks.Theoretical models and actual data processing results verificated the correctness and validity.
引文
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4 陈生昌,马在田,陈林.三维VSP数据的波动方程偏移成像.天然气工业,2008;28(3):51—53
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6 张关泉.波动方程的上行波和下行波的耦合方程组.应用数学学报,1993;16(2):251—263
7 张宇.振幅保真的单程波方程偏移理论.地球物理学报,2006;49(5):1410—1430
8 Stoffa P L,Fokkema J T,Freire R M D,et al.Split-step Fourier migration.Geophysics,1990;55(4):410—421
9 李录明,罗省贤.相移加校正变范围三维叠前深度偏移.成都理工大学学报,1999;26(4):329—334
10 刘定进,印兴耀.傅立叶有限差分法保幅叠前深度偏移方法.地球物理学报,2007;50(1):268—276
11 沈铭成,李录明,刘明洋,等.基于ADIPI的单程波三维VSP正演模拟方法.煤田地质与勘探,2011;39(5):59—62
12 张军华.在f-k域实现三维波场道内插.石油地球物理勘探,2003;38(1):27—30
13 李录明,罗省贤.三维叠前深度偏移速度模型建立方法.石油物探,1999;38(4):1—4
2 方伍宝,陈林.三维VSP资料波动方程叠前深度偏移研究.石油物探,2006;45(5):527—531
3 王华忠,徐蔚亚,王建民,等.VSP数据波动方程叠前深度偏移成像及立体地震成像.石油地球物理勘探,2001;36(5):517—525
4 陈生昌,马在田,陈林.三维VSP数据的波动方程偏移成像.天然气工业,2008;28(3):51—53
5 张关泉.波场分裂、平方根算子与偏移.马在田.反射地震学论文集.上海:同济大学出版社,2000:16—20
6 张关泉.波动方程的上行波和下行波的耦合方程组.应用数学学报,1993;16(2):251—263
7 张宇.振幅保真的单程波方程偏移理论.地球物理学报,2006;49(5):1410—1430
8 Stoffa P L,Fokkema J T,Freire R M D,et al.Split-step Fourier migration.Geophysics,1990;55(4):410—421
9 李录明,罗省贤.相移加校正变范围三维叠前深度偏移.成都理工大学学报,1999;26(4):329—334
10 刘定进,印兴耀.傅立叶有限差分法保幅叠前深度偏移方法.地球物理学报,2007;50(1):268—276
11 沈铭成,李录明,刘明洋,等.基于ADIPI的单程波三维VSP正演模拟方法.煤田地质与勘探,2011;39(5):59—62
12 张军华.在f-k域实现三维波场道内插.石油地球物理勘探,2003;38(1):27—30
13 李录明,罗省贤.三维叠前深度偏移速度模型建立方法.石油物探,1999;38(4):1—4