叠前弹性参数反演在塔木察格的应用
|
摘要
地震资料的处理和反演从叠后走向叠前是现行地震勘探的发展趋势。以叠前时间偏移和AVO反演技术相结合的叠前弹性参数反演方法是当今研究的热点,该方法为岩性和隐蔽性油气藏的勘探提供了较为有效的识别方法。依据弹性波传播的基本理论和平界面反射透射的Zoeppritz方程,本文给出了计算弹性参数的三项公式。算法实现是先将叠前时间偏移的CRP道集转化为角度道集,然后用最小平方法进行优化求解,得到弹性参数的各属性剖面,最后对计算结果进行反演和分析以对储层的含油气性进行有效预测。本文给出了理论模拟数据的反演计算,其反演结果的计算误差较小,可见本文给出的弹性参数反演计算的精度是很高的。将文中给出的叠前弹性参数反演方法应用于海拉尔—塔木察格盆地研究区块,与现行商业软件就纵波阻抗反演结果进行对比分析,本文方法的分辨率较高,且由钻井资料证实该方法对储层的预测精度较高。理论和实际地震数据的反演计算表明本文算法具有高分辨率、高精度和实用性强的特点。
It is the development trend in seismic exploration from the poststack to prestack seismic data processing and inversion.Prestack elastic parameter inversion which combine prestack time migration and AVO inversion algorithm is the focus research topic in seismic data processing and interpretation,the elastic parameter inversion provide a valid way for explore lithological and complex reservoir.The three term formula to calculate the elastic parameter is given in this paper according to the fundamental theory of elastic wave propagation and the Zoeppritz equation based on wave reflection and transmission on horizontal subsurface.In the algorithm,the first step is to get angle gather from CRP(common reflection point) gather after the prestack time migration,and then solve the least-square equation,the result is attribute profiles of elastic parameters.Based on analysis and inversion of the gotten elastic parameter profile,we can predict the possible oil reservoir in the block under researched.The precision of elastic parameter inversion algorithm is high,the inversion result of theoretical data demonstrates that the error is small.The inversion algorithm is applied in Hailaer-Tamsag basin,via the compare analysis between Jason,the poststack wave impedance inversion software and the prestack elastic parameter inversion,the algorithm in this paper has high resolution.The high reservoir prediction precision is verified by the drilling data.The calculated result in theoretical model and field seismic data demonstrate that the proposed technique is validity and applicable,at the same time has high-resolution and high-precision.
It is the development trend in seismic exploration from the poststack to prestack seismic data processing and inversion.Prestack elastic parameter inversion which combine prestack time migration and AVO inversion algorithm is the focus research topic in seismic data processing and interpretation,the elastic parameter inversion provide a valid way for explore lithological and complex reservoir.The three term formula to calculate the elastic parameter is given in this paper according to the fundamental theory of elastic wave propagation and the Zoeppritz equation based on wave reflection and transmission on horizontal subsurface.In the algorithm,the first step is to get angle gather from CRP(common reflection point) gather after the prestack time migration,and then solve the least-square equation,the result is attribute profiles of elastic parameters.Based on analysis and inversion of the gotten elastic parameter profile,we can predict the possible oil reservoir in the block under researched.The precision of elastic parameter inversion algorithm is high,the inversion result of theoretical data demonstrates that the error is small.The inversion algorithm is applied in Hailaer-Tamsag basin,via the compare analysis between Jason,the poststack wave impedance inversion software and the prestack elastic parameter inversion,the algorithm in this paper has high resolution.The high reservoir prediction precision is verified by the drilling data.The calculated result in theoretical model and field seismic data demonstrate that the proposed technique is validity and applicable,at the same time has high-resolution and high-precision.
引文
[1]贾承造,赵文智,邹才能,等.岩性地层油气藏勘探研究的两项核心技术[J].石油勘探与开发,2004,31(3):3~9.
[2]Fatti,J.L.,Vail,P.J.,Smith,G.C.,Strauss,P.J.,and Levitt,P.R..1994.Detection of gas in sandstone reservoirsusing AVO analysis:A 3-D seismic casehistory using the Geostack technique.Geophysics,59,1362~1376.
[3]Duffaut K.and Landr?M..2007.Vp/Vsratio versus differential stress and rockconsolidation-A comparison between rockmodels and time-lapse AVO data.Geophysics,72(5):81~94.
[4]彭苏萍,高云峰,杨瑞召,等.AVO探测煤层瓦斯富集的理论探讨和初步实践—以淮南煤田为例[J].地球物理学报,2005,48(6):1475~1486.
[5]孟宪军,慎国强,王玉梅,等.叠前AVA地震纵横波阻抗同步反演技术研究[J].石油物探,2004,43:53~55.
[6]甘利灯,赵邦六,杜文辉,等.弹性阻抗在岩性和流体预测中的潜力分析[J].石油物探,2005,44(5):504~508.
[7]Shuey,R..1985.A simplification ofZoeppritz equations.Geophysics,50,609~614.
[8]Ursin,B.,and Tjaland,E..1992.Information content of the elasticreflection matrix.62nd Ann.,Mtg.,Soc.Expl.Geophys.,ExpandedAbstracts,796~799.
[9]Debski,W.,and Tarantola,A..1995.Information on elastic parameters obtainedfrom the amplitudes of reflected waves.Geophysics,60,1426~1436.
[10]Tarantola,A..1986.A strategy fornonlinear elastic inversion for seismicreflection data.Geophysics,51,1983~1903.
[2]Fatti,J.L.,Vail,P.J.,Smith,G.C.,Strauss,P.J.,and Levitt,P.R..1994.Detection of gas in sandstone reservoirsusing AVO analysis:A 3-D seismic casehistory using the Geostack technique.Geophysics,59,1362~1376.
[3]Duffaut K.and Landr?M..2007.Vp/Vsratio versus differential stress and rockconsolidation-A comparison between rockmodels and time-lapse AVO data.Geophysics,72(5):81~94.
[4]彭苏萍,高云峰,杨瑞召,等.AVO探测煤层瓦斯富集的理论探讨和初步实践—以淮南煤田为例[J].地球物理学报,2005,48(6):1475~1486.
[5]孟宪军,慎国强,王玉梅,等.叠前AVA地震纵横波阻抗同步反演技术研究[J].石油物探,2004,43:53~55.
[6]甘利灯,赵邦六,杜文辉,等.弹性阻抗在岩性和流体预测中的潜力分析[J].石油物探,2005,44(5):504~508.
[7]Shuey,R..1985.A simplification ofZoeppritz equations.Geophysics,50,609~614.
[8]Ursin,B.,and Tjaland,E..1992.Information content of the elasticreflection matrix.62nd Ann.,Mtg.,Soc.Expl.Geophys.,ExpandedAbstracts,796~799.
[9]Debski,W.,and Tarantola,A..1995.Information on elastic parameters obtainedfrom the amplitudes of reflected waves.Geophysics,60,1426~1436.
[10]Tarantola,A..1986.A strategy fornonlinear elastic inversion for seismicreflection data.Geophysics,51,1983~1903.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心