弹性波阻抗公式精度及参数敏感性分析
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摘要
从表达形式、理论基础、假设条件出发,系统地介绍了7种纵波弹性阻抗的概念,比较了各弹性阻抗对4类AVO砂岩模型的近似精度,并分析各表达式对背景参数变化的敏感程度。研究结果表明,Verwest弹性波阻抗精度最高,尤其当入射角较大时,且与背景参数无关,稳定性好。
Starting from the expression form,theoretical basis and hypothetical conditions,seven kinds of P-wave elastic impedance concepts were systematically introduced.The approximate accuracy of each elastic impedance to four types of AVO sandstone models was compared,and the sensitivity of each expression to the variation of background parameters was analyzed.The results showed that Verwest elastic wave impedance has the highest accuracy,especially when the incident angle was large,and it was independent of background parameters,and has good stability.
Starting from the expression form,theoretical basis and hypothetical conditions,seven kinds of P-wave elastic impedance concepts were systematically introduced.The approximate accuracy of each elastic impedance to four types of AVO sandstone models was compared,and the sensitivity of each expression to the variation of background parameters was analyzed.The results showed that Verwest elastic wave impedance has the highest accuracy,especially when the incident angle was large,and it was independent of background parameters,and has good stability.
引文
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[7] Ma,J.The extending of elastic impedance and generalized elastic impedance expanded abstracts[J].CPS/SEG Geophys,2004:818-822.
[8] Santos,L.T.,M.Tygel.Impedance-type approximations of the P-Pelastic reflection coefficient:modeling and AVO inversion[J].Geophysics,2004(69):592-598.
[9] Bortfeld,R.Approximations to the reflection and transmission coefficients of plane longitudinal and transverse waves[J].Geophysical Prospecting,1961(9):485-503.
[10] VerWest,B.,R.Masters,A.Sena.Elastic impedance inversion:70th annual international meeting[J].SEG,2000:1580-1582.
[11] VerWest,B.Elastic impedance revisited:66th conference and exhibition[J].EAGE,2004:342.
[12] 张奎,倪逸.三种弹性波阻抗公式比较[J].石油地球物理勘探,2006,41(Z1):7-11.Zhang Kui,Ni Yi.Comparison among three elastic wave impedance formulas[J].Oil Geophysical Prospecting,2006,41(Z1):7-11.
[2] Connolly P.Elastic impedance[J].The Leading Edge,1999(18):438-452.
[3] Whitcombe,D.N.Elastic impedance normalization[J].Geophysics,2002(67):60-62.
[4] Whitcombe,D.N.,P.Connoly,P.L.Reagan,et al.Extended elastic impedance for fluid and lithology prediction[J].Geophysics,2002(67):63-67.
[5] Shuey R T.A simplification of the zoeppritz equations[J].Geophysics,1985(50):609-614.
[6] Ma,J.and Morozov,I.B.Ray-path elastic impedance expanded abstract[J].Canadian SEG Convention,2004:4.
[7] Ma,J.The extending of elastic impedance and generalized elastic impedance expanded abstracts[J].CPS/SEG Geophys,2004:818-822.
[8] Santos,L.T.,M.Tygel.Impedance-type approximations of the P-Pelastic reflection coefficient:modeling and AVO inversion[J].Geophysics,2004(69):592-598.
[9] Bortfeld,R.Approximations to the reflection and transmission coefficients of plane longitudinal and transverse waves[J].Geophysical Prospecting,1961(9):485-503.
[10] VerWest,B.,R.Masters,A.Sena.Elastic impedance inversion:70th annual international meeting[J].SEG,2000:1580-1582.
[11] VerWest,B.Elastic impedance revisited:66th conference and exhibition[J].EAGE,2004:342.
[12] 张奎,倪逸.三种弹性波阻抗公式比较[J].石油地球物理勘探,2006,41(Z1):7-11.Zhang Kui,Ni Yi.Comparison among three elastic wave impedance formulas[J].Oil Geophysical Prospecting,2006,41(Z1):7-11.