动校拉伸及调谐效应对AVO反演的影响
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摘要
采用大炮检距地震数据进行AVO反演可以提高反演的精度及稳定性,但大炮检距地震数据存在动校拉伸和随炮检距变化的调谐效应,这会使AVO反演产生误差。基于Dong的近似公式推导出梯度的相对误差表达式,从理论上分析了动校拉伸和调谐效应对4类含气砂岩模型AVO反演的影响。制作了4类含气砂岩模型的合成地震记录,基于贝叶斯理论进行了AVO截距和梯度反演,并将反演结果与理论曲线进行了对比分析。从分析结果看,动校拉伸和调谐效应影响梯度反演的精度,对截距反演的影响较小。
The accuracy and stability of AVO inversion can be improved by adapting large offset seismic data.However,NMO stretch and offset-dependent tuning existing in large offset seismic data,which causes error of AVO inversion.Based on the Dong's approximate formula,the relative error formula of the AVO gradient was deduced, then the influence of NMO stretch and offset-dependent tuning on four AVO models was theoretically analyzed.Synthetic seismogram of four types of gas-bearing sand model was made.Based on Bayesian theorem,the AVO intercept and gradient was inversed, the inversion results were compared to the theoretical curves.From the analysis result,the NMO stretch and tuning effect impacts the accuracy of AVO gradient inversion,has smaller influence on AVO intercept inversion.
The accuracy and stability of AVO inversion can be improved by adapting large offset seismic data.However,NMO stretch and offset-dependent tuning existing in large offset seismic data,which causes error of AVO inversion.Based on the Dong's approximate formula,the relative error formula of the AVO gradient was deduced, then the influence of NMO stretch and offset-dependent tuning on four AVO models was theoretically analyzed.Synthetic seismogram of four types of gas-bearing sand model was made.Based on Bayesian theorem,the AVO intercept and gradient was inversed, the inversion results were compared to the theoretical curves.From the analysis result,the NMO stretch and tuning effect impacts the accuracy of AVO gradient inversion,has smaller influence on AVO intercept inversion.
引文
1 Buland A,Omre H.Bayesian linearized AVO inversion [J].Geophysics,2003,68(1 ):185- 198
2李景叶,陈小宏,郝振江.多波时移地震AVO反演研究[J].地球物理学报,2005,48(4):902-908
3朱兆林,赵爱国.裂缝介质的纵波方位AVO反演研究[J].石油物探,2005,44(5):499-503
4刘朋波,蒲仁海,潘仁芳,等.多方位AVO技术在裂缝检测中的应用[J].石油地球物理勘探,2008,43(4): 437-442
5牛滨华,文鹏飞.基于BSR的AVO正演估算水合物含量方法的研究[J].地球物理学报,2006,49(1):143- 1 52
6常锁亮,杨起,刘大锰,等.煤层气储层物性预测的AVO技术对地震纵波资料品质要求的探讨[J].地球物理学进展,2008,23(4):1 236-1 243
7 Dunkin J W,Levin F K.Effect of normal move out on a seismic pulse[J].Geophysics,1973,38(4):635-642
8 Lin T L,Phair R.AVO tuning[J].Expanded Abstracts of 63~(rd) Annual Internat SEG Mtg,1993,727-730
9 Dong W.AVO delectability against tuning and stretching artifacts[J].Geophysics,1999,64(2):494-503
10 Dong W.Fluid line distortion due to migration stretch [J].Expanded Abstracts of 66~(th) Annual Internat SEG Mtg,1996,1 345-1 348 Castagna J P,Swan H W.Principles of AVO cross plotting[J].The Leading Edge,1997,16(4):337-342
12 Mohammed A O.Thin-bed amplitude-versus-offset [D].Houston,U S A:University of Houston,2002.
13 Zoeppritz K.On the reflection and penetration of seismic waves through unstable layer(?)[J].Goettinger Nachr,1919,66-84
14 Shuey R T.A simplification of the Zoeppritz equations [J].Geophysics,1985,50(4):609-614
15陈建江,印兴耀,张广智.层状介质AVO叠前反演[J].石油地球物理勘探,2006,41(6):656-662
2李景叶,陈小宏,郝振江.多波时移地震AVO反演研究[J].地球物理学报,2005,48(4):902-908
3朱兆林,赵爱国.裂缝介质的纵波方位AVO反演研究[J].石油物探,2005,44(5):499-503
4刘朋波,蒲仁海,潘仁芳,等.多方位AVO技术在裂缝检测中的应用[J].石油地球物理勘探,2008,43(4): 437-442
5牛滨华,文鹏飞.基于BSR的AVO正演估算水合物含量方法的研究[J].地球物理学报,2006,49(1):143- 1 52
6常锁亮,杨起,刘大锰,等.煤层气储层物性预测的AVO技术对地震纵波资料品质要求的探讨[J].地球物理学进展,2008,23(4):1 236-1 243
7 Dunkin J W,Levin F K.Effect of normal move out on a seismic pulse[J].Geophysics,1973,38(4):635-642
8 Lin T L,Phair R.AVO tuning[J].Expanded Abstracts of 63~(rd) Annual Internat SEG Mtg,1993,727-730
9 Dong W.AVO delectability against tuning and stretching artifacts[J].Geophysics,1999,64(2):494-503
10 Dong W.Fluid line distortion due to migration stretch [J].Expanded Abstracts of 66~(th) Annual Internat SEG Mtg,1996,1 345-1 348 Castagna J P,Swan H W.Principles of AVO cross plotting[J].The Leading Edge,1997,16(4):337-342
12 Mohammed A O.Thin-bed amplitude-versus-offset [D].Houston,U S A:University of Houston,2002.
13 Zoeppritz K.On the reflection and penetration of seismic waves through unstable layer(?)[J].Goettinger Nachr,1919,66-84
14 Shuey R T.A simplification of the Zoeppritz equations [J].Geophysics,1985,50(4):609-614
15陈建江,印兴耀,张广智.层状介质AVO叠前反演[J].石油地球物理勘探,2006,41(6):656-662
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