面向目标的叠前角度道集提取策略
|
摘要
为解决三维叠前角度道集的生成和存储问题,在局部谐波分解思路的基础上,将二维情形下的角度道集生成技术推广到三维情形。方法的基本原理是:通过定义局部角度变换、波数和空间域滤波因子,给出入射波及散射波的角度域表达形式;利用上(下)行波的角度道集三角展开系数,结合相关成像条件,生成反射系数角度道集的三角展开系数体,并由指数映射,获得反射系数角度道集。在具体实现时,利用面向目标的大步长波场延拓,实现快速、准确,针对目标层的偏移成像,同时,在角度域计算谐波分解三角展开系数;采用炮域并行思路,将主节点和各节点的计算加以分解,以节省各节点中间环节的角度道集存储空间,各节点只计算三角展开系数,在主节点回收并生成系数数据体;然后,根据具体目标需求,输出相应的角度道集。由此,极大地减少了角度道集数据存储量,解决了计算效率及存储空间问题。利用中国东部某油田的三维地震资料对方法进行了测试,结果表明方法可行实用。
To solve the problems of the generation and storage for 3-D prestack angle gathers,based on the idea of local harmonic decom- position,the 2-D angle gathers generation technology was extended to 3-D.The principles of this method are as follows.The expres- sions for incident wave and scattered wave in angle domain are presented through defining local angle transform and filtering fac- tors in wave-number domain and spatial domain.Utilizing the trig- onometric expansion coefficients of angle gathers for up-and down- going waves,together with relevant imaging conditions,the trigo- nometric expansion coefficients cube of reflectivity angle gathers is generated.Furthermore,with exponential mapping,reflectivity angle gathers are obtained.When coding the program,the research result of object-oriented large-step wavefield extrapolation is also resorted to realize the high efficient,accurate and target-aimed im- aging.Meanwhile,the trigonometric expansion coefficients of har- monic decomposition are calculated in angle domain.The program adopts shot domain parallel scheme where the computation for host-node and that for servant-nodes are separated so as to free servant-nodes from saving angle gathers in middle procedures. Thus,the main duty for servant-nodes is to compute trigonometric expansion coefficients,while that for host-node is to reclaim them and generate a coefficients cube.Then,according to specific de- mands for target profile or cube,corresponding angle gathers are formed.Thanks to the schemes above,rather less disk space is e- nough for generating angle gathers.So,the problems of computing efficiency and storage are solved.The result of test,with 3D seis- mic data from an oilfield in Eastern China,shows that this method is feasible and practical.
To solve the problems of the generation and storage for 3-D prestack angle gathers,based on the idea of local harmonic decom- position,the 2-D angle gathers generation technology was extended to 3-D.The principles of this method are as follows.The expres- sions for incident wave and scattered wave in angle domain are presented through defining local angle transform and filtering fac- tors in wave-number domain and spatial domain.Utilizing the trig- onometric expansion coefficients of angle gathers for up-and down- going waves,together with relevant imaging conditions,the trigo- nometric expansion coefficients cube of reflectivity angle gathers is generated.Furthermore,with exponential mapping,reflectivity angle gathers are obtained.When coding the program,the research result of object-oriented large-step wavefield extrapolation is also resorted to realize the high efficient,accurate and target-aimed im- aging.Meanwhile,the trigonometric expansion coefficients of har- monic decomposition are calculated in angle domain.The program adopts shot domain parallel scheme where the computation for host-node and that for servant-nodes are separated so as to free servant-nodes from saving angle gathers in middle procedures. Thus,the main duty for servant-nodes is to compute trigonometric expansion coefficients,while that for host-node is to reclaim them and generate a coefficients cube.Then,according to specific de- mands for target profile or cube,corresponding angle gathers are formed.Thanks to the schemes above,rather less disk space is e- nough for generating angle gathers.So,the problems of computing efficiency and storage are solved.The result of test,with 3D seis- mic data from an oilfield in Eastern China,shows that this method is feasible and practical.
引文
1陈凌，吴如山，王伟君．基于Gabor-Daubechies小波束叠前深度偏移的角度域共成像道集[J]．地球物理学报，2004，47(5)：876～885
2 Prucha M,Biondi B,Symes W.Angle-domain common image-point gathers by wave-equation migration[J]. Expanded Abstracts of 69~(th) Annual Internat SEG Mtg, 1999,824～827
3 Sava P C,Fomel S.Angle-domain common-image gathers by wavefield continuation method[J].Geo- physics,2003,68(3):1065～1074
4 Biondi B,Symes W.Angle-domain common-image gathers for migration velocity analysis by wavefield- continuation imaging[J].Geophysics,2004,69(5): 1283～1298
5 Soubaras R.Angle gathers for shot-record migration by local harmonic decomposition[J].Expanded Ab- stracts of 73~(rd) Annual Internat SEG Mtg,2003,889～892
6胡中平，孔祥宁，潘宏勋等．叠前深度域地震属性技术研究及展望[J]．石油物探．2004，43(增刊)：28～30
7张宇．振幅保真的单程波方程偏移理论[J]．地球物理学报，2006，49(5)：1410～1430
8刘洪，袁江华，陈景波等．大步长波场深度延拓的理论[J]．地球物理学报，2006，49(6)：1779～1793
9张文生，张关泉．SEG/EAEG盐丘模型的三维分步傅里叶炮集叠前深度偏移[J]．石油物探，2002，41(4)：396～399
10刘礼农，周立宏，朱振宇等．复杂观测系统下的三维波动方程叠前深度偏移[J]．地球物理学进展，2002，17 (4)：658～662
11张文生，张关泉，宋海斌．高精度混合法叠前深度偏移及其并行实现[J]．地球物理学报，2001，44(4)：542～551
12张文生，张关泉，郝现军．Marmousi模型单炮叠前深度偏移的广义相位屏法及其并行实现[J]．石油物探，2000，39(3)：1～7
13赵景霞，张叔伦，孙沛勇等．三维并行合成震源记录叠前深度偏移[J]．地球物理学报，2006，49(1)：225～233
14张文生．三维合成炮叠前深度偏移[J]．石油物探，2003，42(4)：448～451
15孟祥宾，杨淑卿，徐兆涛等．波动方程叠前深度偏移并行计算及其应用效果[J]．勘探地球物理进展，2004，27 (3)：213～217
16朱振宇，刘洪，李幼铭．波动方程叠前深度偏移及并行计算在南黄海地区的应用[J]．地球物理学进展，2003，18(2)：302～305
17张军华，雷凌，仝兆歧．PC-Cluster技术的国内外现状与发展趋势[J]．石油物探，2003，42(4)：557～561
18杨辉，高亮，刘洪等．微机群并行实现Marmousi模型叠前深度偏移[J]．地球物理学进展，2001，16(3)：68～75
19赵连功，刘洪．地震勘探数据资料处理软件集成化研究现状和发展趋势[J]．地球物理学进展，2003，18(4)：598～601
20王云专，杨立伟，李素华．剩余时差校正及泊松比反演[J]．地球物理学进展，2006，21(1)：214～218
21黄中玉，赵金州．纵波和转换波AVO联合反演技术[J]．石油物探，2004，43(4)：319～322
22叶勇，郑雄．偏移速度分析技术新进展[J]．勘探地球物理进展，2003，26(2)：136～142
2 Prucha M,Biondi B,Symes W.Angle-domain common image-point gathers by wave-equation migration[J]. Expanded Abstracts of 69~(th) Annual Internat SEG Mtg, 1999,824～827
3 Sava P C,Fomel S.Angle-domain common-image gathers by wavefield continuation method[J].Geo- physics,2003,68(3):1065～1074
4 Biondi B,Symes W.Angle-domain common-image gathers for migration velocity analysis by wavefield- continuation imaging[J].Geophysics,2004,69(5): 1283～1298
5 Soubaras R.Angle gathers for shot-record migration by local harmonic decomposition[J].Expanded Ab- stracts of 73~(rd) Annual Internat SEG Mtg,2003,889～892
6胡中平，孔祥宁，潘宏勋等．叠前深度域地震属性技术研究及展望[J]．石油物探．2004，43(增刊)：28～30
7张宇．振幅保真的单程波方程偏移理论[J]．地球物理学报，2006，49(5)：1410～1430
8刘洪，袁江华，陈景波等．大步长波场深度延拓的理论[J]．地球物理学报，2006，49(6)：1779～1793
9张文生，张关泉．SEG/EAEG盐丘模型的三维分步傅里叶炮集叠前深度偏移[J]．石油物探，2002，41(4)：396～399
10刘礼农，周立宏，朱振宇等．复杂观测系统下的三维波动方程叠前深度偏移[J]．地球物理学进展，2002，17 (4)：658～662
11张文生，张关泉，宋海斌．高精度混合法叠前深度偏移及其并行实现[J]．地球物理学报，2001，44(4)：542～551
12张文生，张关泉，郝现军．Marmousi模型单炮叠前深度偏移的广义相位屏法及其并行实现[J]．石油物探，2000，39(3)：1～7
13赵景霞，张叔伦，孙沛勇等．三维并行合成震源记录叠前深度偏移[J]．地球物理学报，2006，49(1)：225～233
14张文生．三维合成炮叠前深度偏移[J]．石油物探，2003，42(4)：448～451
15孟祥宾，杨淑卿，徐兆涛等．波动方程叠前深度偏移并行计算及其应用效果[J]．勘探地球物理进展，2004，27 (3)：213～217
16朱振宇，刘洪，李幼铭．波动方程叠前深度偏移及并行计算在南黄海地区的应用[J]．地球物理学进展，2003，18(2)：302～305
17张军华，雷凌，仝兆歧．PC-Cluster技术的国内外现状与发展趋势[J]．石油物探，2003，42(4)：557～561
18杨辉，高亮，刘洪等．微机群并行实现Marmousi模型叠前深度偏移[J]．地球物理学进展，2001，16(3)：68～75
19赵连功，刘洪．地震勘探数据资料处理软件集成化研究现状和发展趋势[J]．地球物理学进展，2003，18(4)：598～601
20王云专，杨立伟，李素华．剩余时差校正及泊松比反演[J]．地球物理学进展，2006，21(1)：214～218
21黄中玉，赵金州．纵波和转换波AVO联合反演技术[J]．石油物探，2004，43(4)：319～322
22叶勇，郑雄．偏移速度分析技术新进展[J]．勘探地球物理进展，2003，26(2)：136～142
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心