利用共聚焦点方法消除复杂的近地表效应
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摘要
复杂的近地表效应会降低地震数据的质量,通常假设射线垂直地穿过近地表来消除其影响。共聚焦点方法把近地表效应当作成像问题的一部分来处理。依据等旅行时原理估算出波场的传播算子,在差异时移模板中进行算子更新,再用这些算子重建基准面。利用修正后的层析反演,把重建基准面后的数据校正到合适深度,得到近地表速度模型。对复杂的合成数据集进行处理,可消除复杂地表的影响,得到令人满意的叠加剖面。
Complex near surface effect degrades the quality of seismic data Conventionally the effect is handled by assuming that raypaths travel vertically through the near surface. With common focus-point method, we treated the effect as part of imaging problem. Operators of wavefield propagation estimated by the principle of equal trav-eltime, which would be used for redatuming, were updated in differential time shift (DTS) panels. The reda-tumed data were then corrected to the proper depths. The correctness of the method was tested on synthetic data-set.
Complex near surface effect degrades the quality of seismic data Conventionally the effect is handled by assuming that raypaths travel vertically through the near surface. With common focus-point method, we treated the effect as part of imaging problem. Operators of wavefield propagation estimated by the principle of equal trav-eltime, which would be used for redatuming, were updated in differential time shift (DTS) panels. The reda-tumed data were then corrected to the proper depths. The correctness of the method was tested on synthetic data-set.
引文
1 俞国柱.共聚焦点(CFP)成像技术述评[J].石油地球物理勘探,2002,37(4) :412-422
2 Cox M. Static corrections for seismic reflection surveys [M]. USA Tulsa: Society of Exploration Geophysicists, 1999． 531页
3 Taner M T, Berkhout A J. Statics, a physical view[J]. Extended Abstracts of 59th EAGE Conference and Technical Exhibition, 1997,28-29
4 Berkhout A. Pushing the limits of seismic imaging, part I: Prestack migration in terms of double dynamic focu-sing[J]. Geophysics, 1997, 62(3) : 937-953
5 李振春,张凯,张建磊,等.共聚焦点偏移成像方法研究[J].石油物探,2003,42(1) :16-21
6 娄晓东,曹谊,赵青.地震处理新方法--共聚焦点技术[J].勘探地球物理进展,2002,25(5) :7-17
7 Hegge R Seismic macromodel estimation by inversion of focusing operators: [Ph. D thesis]. Holland:Delft U-niversity of Technology, 2000
8 Bolte J, Verschuur D. Aspects of focusing operator up-dating[J]. Expanded Abstracts of 68th Annual Internal SEG Mtg, 1998,1604-1607
9 Hindriks C,Duijndam A. Handling near surface effects in imaging by using common focal point technology [J]. Expanded Abstracts of 69th Annual Internal SEG Mtg, 1999,575-578
10 Kelamis P G, Ericsson K E, Taner T, el al. CFP-based redaluming: Synlhelic and field data examples [J]. Expanded Abslracls of 70th Annual Inlernat SEG Mtg,2000,509-512
11 Tarantola A. Inverse problem theory [M]. Elsevier: Press, 1987． 405-408
2 Cox M. Static corrections for seismic reflection surveys [M]. USA Tulsa: Society of Exploration Geophysicists, 1999． 531页
3 Taner M T, Berkhout A J. Statics, a physical view[J]. Extended Abstracts of 59th EAGE Conference and Technical Exhibition, 1997,28-29
4 Berkhout A. Pushing the limits of seismic imaging, part I: Prestack migration in terms of double dynamic focu-sing[J]. Geophysics, 1997, 62(3) : 937-953
5 李振春,张凯,张建磊,等.共聚焦点偏移成像方法研究[J].石油物探,2003,42(1) :16-21
6 娄晓东,曹谊,赵青.地震处理新方法--共聚焦点技术[J].勘探地球物理进展,2002,25(5) :7-17
7 Hegge R Seismic macromodel estimation by inversion of focusing operators: [Ph. D thesis]. Holland:Delft U-niversity of Technology, 2000
8 Bolte J, Verschuur D. Aspects of focusing operator up-dating[J]. Expanded Abstracts of 68th Annual Internal SEG Mtg, 1998,1604-1607
9 Hindriks C,Duijndam A. Handling near surface effects in imaging by using common focal point technology [J]. Expanded Abstracts of 69th Annual Internal SEG Mtg, 1999,575-578
10 Kelamis P G, Ericsson K E, Taner T, el al. CFP-based redaluming: Synlhelic and field data examples [J]. Expanded Abslracls of 70th Annual Inlernat SEG Mtg,2000,509-512
11 Tarantola A. Inverse problem theory [M]. Elsevier: Press, 1987． 405-408
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