几种P-SV转换波反射系数近似公式的比较
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摘要
多波多分量勘探利用了纵波和转换波的AVO属性来了解复杂的构造、岩性、裂隙裂缝的情况,以及确定地下流体的性质等。影响AVO属性的因素有很多,其反演的多解性很强,将纵波和转换波的AVO属性综合起来应用,就会大大减少多解性,还可以得到更多的岩石物理参数,并能提高一些参数的精度。AVO近似方程可以对单一的纵波、转换波,或纵、横波联合进行AVO岩性参数拟合反演。为此,对P-SV转换波反射系数近似公式进行了讨论和总结,并用理论模型对近似公式的特点和精度进行了分析。
Multiwave and multicomponent exploration is u-sing AVO attributes of compressional and converted waves to discriminate complex structures, lithology, and fractures as well as to determine underground fluids over past years. P and S waves, which are affected by different petrophysical parameters, appear different characteristics. Because P wave is related to Lame coefficients λ and μ,S wave is related just to μ. AVO influenced by several factors. AVO inversion exists multi resolution strongly. The simultaneous inversion of P-P and P-SV will not only reduces multi resolution but also gets more petrophysical parameters and improves precision of parameters greatly. Approximate expressions are applicable to AVO inversion, such as P-P, P-SV, jointed inversion P-P and P-SV. This article summarizes three styles of AVO attribution inversions of converted wave and analyzes feature and precision respectively, preparing for simultaneous inversion of P-P and P-SV.
Multiwave and multicomponent exploration is u-sing AVO attributes of compressional and converted waves to discriminate complex structures, lithology, and fractures as well as to determine underground fluids over past years. P and S waves, which are affected by different petrophysical parameters, appear different characteristics. Because P wave is related to Lame coefficients λ and μ,S wave is related just to μ. AVO influenced by several factors. AVO inversion exists multi resolution strongly. The simultaneous inversion of P-P and P-SV will not only reduces multi resolution but also gets more petrophysical parameters and improves precision of parameters greatly. Approximate expressions are applicable to AVO inversion, such as P-P, P-SV, jointed inversion P-P and P-SV. This article summarizes three styles of AVO attribution inversions of converted wave and analyzes feature and precision respectively, preparing for simultaneous inversion of P-P and P-SV.
引文
1石玉梅,姚逢昌,曹宏.多波多分量天然气勘探技术的进展[J].勘探地球物理进展,2003,26(3):172~177
2徐丽萍,杨勤勇.多波多分量地震技术发展与展望[J].勘探地球物理进展,2002,25(3):47-52
3徐仲达,郝晓红,徐翔之,等.用VSP数据中下行P-SV转换横波求取横波速度[J].石油物探,2002,41(3):274~278
4张卫红,徐亦鸣,刘丽.VSP转换波成像技术及实例分析[J].石油物探,2003,42(1):42~48
5 Aki K I, Richards P G. Quantitative seismology[M]. San Francisco:W H Freeman and Co,1980. 144-154
6郑晓东.AVO理论和方法的一些新进展[J].石油地球物理勘探,1992,27(3):305~317
7周竹生.P-SV波和SH波的AVO分析[J].石油地球物理勘探,1993,28(4):430~438
8甘永忠.用P-SV波叠加剖面合成横波层速度剖面[J].石油地球物理勘探,1995,30(1):56-61
9 Stewart R, Zhang Q,Guthoff F. Relationships among e-lastic-wave values: RPP ,RPS ,RSS,vp, vs,ρ,σ and κ. The CREWES Research Report, http: //www. crewes. org/ Reports/1995/1995 - 10. pdf
2徐丽萍,杨勤勇.多波多分量地震技术发展与展望[J].勘探地球物理进展,2002,25(3):47-52
3徐仲达,郝晓红,徐翔之,等.用VSP数据中下行P-SV转换横波求取横波速度[J].石油物探,2002,41(3):274~278
4张卫红,徐亦鸣,刘丽.VSP转换波成像技术及实例分析[J].石油物探,2003,42(1):42~48
5 Aki K I, Richards P G. Quantitative seismology[M]. San Francisco:W H Freeman and Co,1980. 144-154
6郑晓东.AVO理论和方法的一些新进展[J].石油地球物理勘探,1992,27(3):305~317
7周竹生.P-SV波和SH波的AVO分析[J].石油地球物理勘探,1993,28(4):430~438
8甘永忠.用P-SV波叠加剖面合成横波层速度剖面[J].石油地球物理勘探,1995,30(1):56-61
9 Stewart R, Zhang Q,Guthoff F. Relationships among e-lastic-wave values: RPP ,RPS ,RSS,vp, vs,ρ,σ and κ. The CREWES Research Report, http: //www. crewes. org/ Reports/1995/1995 - 10. pdf
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