相干层速度反演在叠前深度偏移中的应用
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摘要
常规时间偏移和叠后深度偏移均不能解决崎岖海底地区地震成像问题,而叠前深度偏移是解决这一问题的有效方法。叠前深度偏移的效果取决于建立的速度-深度模型的精度,而相干层速度反演方法与深度域层析成像相结合,有能力得到更为准确的速度场。基于模型,分析了影响相干层速度反演精度的因素:上层速度反演的结果会明显地影响到下层速度反演的结果和叠前深度偏移成像的质量;解释层位时,要把关键层位解释出来,不能忽略重要的上覆地层,即构造复杂时,应逐层反演。
Conventional time migration and post-stack depth migration could not be used to solve the problem of rugged seabed seismic imaging,while pre-stack depth migration was an effective way to solve the problem.The effect of pre-stack depth migration depended on speed-depth of the model,while the coherent velocity inversion combined with the tomography could obtain more accurate velocity field.Based on the model,the factors influencing the coherent velocity inversion accuracy are analyzed,the upper velocity inversion results would significantly affect the results of the lower velocity inversion and pre-stack depth migration imaging quality;the important layer must be explained,the importance of the overlying strata can not ignored,when the structure is complicated,layer-by-layer inversion should be carried out.
Conventional time migration and post-stack depth migration could not be used to solve the problem of rugged seabed seismic imaging,while pre-stack depth migration was an effective way to solve the problem.The effect of pre-stack depth migration depended on speed-depth of the model,while the coherent velocity inversion combined with the tomography could obtain more accurate velocity field.Based on the model,the factors influencing the coherent velocity inversion accuracy are analyzed,the upper velocity inversion results would significantly affect the results of the lower velocity inversion and pre-stack depth migration imaging quality;the important layer must be explained,the importance of the overlying strata can not ignored,when the structure is complicated,layer-by-layer inversion should be carried out.
引文
[1]陈礼.基于深水崎岖海底理论模型分析叠前深度偏移技术的有效性[D].武汉:中国地质大学(武汉),2005.
[2]李来林,吴清岭,何玉前,等.叠前深度成像技术分析与应用[J].石油地球物理勘探,2005,40(4):407~410.
[3]王者顺,樊佳芳,王卫江.叠前逐层成像速度建模方法及其应用[J].石油物探,2004,43(4):384~387.
[4]罗省贤,李录明.三维叠前深度偏移速度模型建立方法[J].石油物探,1999,38(4):1~6.
[5]方伍宝.三维叠前深度偏移的建模技术[J].石油物探,2002,41(2):132~135.
[6]程玖兵,王华忠,于富文,等.波动方程共炮检距道集叠前深度偏移[J].石油地球物理勘探,2001,36(5):526~529.
[7]常建华,张玉娥,林卫,等.三维叠前深度偏移处理技术应用[J].物探与化探,1999,(4):271~276.
[8]Liu Z,Bleistein N.Velocity analysis by residual moveout[A].Expanded Abstracts of 62th Annual Internat SEG Mtg[C].Ft.Belvoir:Defense Technical Information Center,1992.1034~1036.
[2]李来林,吴清岭,何玉前,等.叠前深度成像技术分析与应用[J].石油地球物理勘探,2005,40(4):407~410.
[3]王者顺,樊佳芳,王卫江.叠前逐层成像速度建模方法及其应用[J].石油物探,2004,43(4):384~387.
[4]罗省贤,李录明.三维叠前深度偏移速度模型建立方法[J].石油物探,1999,38(4):1~6.
[5]方伍宝.三维叠前深度偏移的建模技术[J].石油物探,2002,41(2):132~135.
[6]程玖兵,王华忠,于富文,等.波动方程共炮检距道集叠前深度偏移[J].石油地球物理勘探,2001,36(5):526~529.
[7]常建华,张玉娥,林卫,等.三维叠前深度偏移处理技术应用[J].物探与化探,1999,(4):271~276.
[8]Liu Z,Bleistein N.Velocity analysis by residual moveout[A].Expanded Abstracts of 62th Annual Internat SEG Mtg[C].Ft.Belvoir:Defense Technical Information Center,1992.1034~1036.
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