一种简便的海洋P-SV转换波叠前偏移成像处理方法
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摘要
在莺歌海盆地,地震模糊区的成像一直是勘探工作中的一大难题,1998年在该地区采集了多波地震资料,通过对P-SV波的处理,在模糊带成像方面取得了较好的处理效果[1]。在对常规P-SV波处理中的偏移技术等存在的特殊问题进行分析的基础上,提出了一种P-SV波叠前偏移处理的方法,该方法将输入道分选成共转换散射点道集(CCSP),在CCSP道集中,双程旅行时和等效炮检距之间满足双曲线关系,故而使得常规处理P-P波的Kirchhof叠前偏移在此也可以运用,至于速度分析它也可以运用P-P波的速度分析方式来进行,因此采用该方法简化了转换波的处理,同时也提高了P-SV波的成像效果。
How to improve the obscure-zone images is a very difficult problem in seismic exploration in Yinggehai basin.In order to resolve this problem,multi-wave seismic data were acquired in 1998 in the area.Through P-SV wave processing,good imaging was achieved in obscure zone.On the basis of analysis on special problems,in migration of processing P-SV waves,a new prestack migration technique for P-SV waves was put forward.This technique sorted raw data into common converted scattering points to form CCSP gather.In the CCSP gather,two-way travel time and equivalent offset accord with hyperbola relationship,so Kirchhoff prestack time migration used to conventional P-P wave can be applied to it.Velocity analysis can also be processed by P-P wave method. Therefore this technique simplifies P-SV processing flow and improves P-SV image result.
How to improve the obscure-zone images is a very difficult problem in seismic exploration in Yinggehai basin.In order to resolve this problem,multi-wave seismic data were acquired in 1998 in the area.Through P-SV wave processing,good imaging was achieved in obscure zone.On the basis of analysis on special problems,in migration of processing P-SV waves,a new prestack migration technique for P-SV waves was put forward.This technique sorted raw data into common converted scattering points to form CCSP gather.In the CCSP gather,two-way travel time and equivalent offset accord with hyperbola relationship,so Kirchhoff prestack time migration used to conventional P-P wave can be applied to it.Velocity analysis can also be processed by P-P wave method. Therefore this technique simplifies P-SV processing flow and improves P-SV image result.
引文
[1]何汉漪.海上多波地震在莺歌海盆地的应用[J].中国海上油气(地质),1999,13(5):310-315.
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[3]董敏惺.多波多分量地震勘探[M].北京:石油工业出版社,2002:114-145.
[4]陈志宏,任科英.地球物理综合解释技术与莺歌海盆地东方区集束勘探[J].石油地球物理勘探,2001,36(增刊):132-138.
[5]JOHN T E.Prestack migration of P-wave and Sv-wave[D].California:Stanford University,1996.
[6]任青春.转换波地震资料处理方法研究[J].吐哈油气,2006,11(1):90-92.
[7]王建民.徐家围子断陷区二维三分量地震资料解释研究[J].石油物探,2008,41(1):61-67.
[2]牛毓荃.石油物探新技术系列调研成果[M].北京:石油工业出版社,1996.
[3]董敏惺.多波多分量地震勘探[M].北京:石油工业出版社,2002:114-145.
[4]陈志宏,任科英.地球物理综合解释技术与莺歌海盆地东方区集束勘探[J].石油地球物理勘探,2001,36(增刊):132-138.
[5]JOHN T E.Prestack migration of P-wave and Sv-wave[D].California:Stanford University,1996.
[6]任青春.转换波地震资料处理方法研究[J].吐哈油气,2006,11(1):90-92.
[7]王建民.徐家围子断陷区二维三分量地震资料解释研究[J].石油物探,2008,41(1):61-67.
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