各向异性介质三维纵横波联合叠前反演方法及应用
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摘要
为了提高储层预测精度,本文利用三维三分量资料及前期处理结果,以各向异性(TI)介质弹性波传播理论为基础,研究了多波精确振幅特征方程,进而推出三维各向异性介质纵横波联合叠前岩性参数反演方法。该方法利用叠前NMO道集,将5个岩性参数在同一方程联合求解,可同时获得5个反演参数。为保持反演参数的独立性,可直接反演地层纵波速度、横波速度、密度及另两个各向异性系数,进而计算出地层的弹性参数、弹性阻抗(EI)及弹性阻抗梯度(EIG)等共13个岩性、弹性参数,用于对岩性及流体的识别和描述。文中采用的纵横波联合叠前反演方法可提高反演的可靠性和精度,经实际三维多波地震数据处理证明了方法的适用性。
In order to raise precision in reservoir prediction,3D3C seismic data and previous processing results were used,based on elastic wave propagation theory in anisotropic medium,multi-wave accurate amplitude characteristic equation (Amplitude Versus Angle) was studied,as a result the PP-PS joint pre-stack lithology inversion method for 3D anisotropic medium was developed.The NMO gathers were used in this method,5 lithologic parameters were jointly solved in one equation so that 5 inversion parameters were obtained at the same time.In order to keep the independence of the inversion parameters,P wave velocity,Share wave velocity,density,and 2 other anisotropic parameters of the formation can be directly inverted,then 13 lithologic and elastic parameters including elastic parameter,elastic impedance,elastic impedance gradient and so on were calculated and were used to identify and describe the lithology and fluid.The PP-PS joint pre-stack inversion method can improve the reliability and accuracy of the inversion,3D multi-wave seismic data processing of the field data proved the suitability of the method.
In order to raise precision in reservoir prediction,3D3C seismic data and previous processing results were used,based on elastic wave propagation theory in anisotropic medium,multi-wave accurate amplitude characteristic equation (Amplitude Versus Angle) was studied,as a result the PP-PS joint pre-stack lithology inversion method for 3D anisotropic medium was developed.The NMO gathers were used in this method,5 lithologic parameters were jointly solved in one equation so that 5 inversion parameters were obtained at the same time.In order to keep the independence of the inversion parameters,P wave velocity,Share wave velocity,density,and 2 other anisotropic parameters of the formation can be directly inverted,then 13 lithologic and elastic parameters including elastic parameter,elastic impedance,elastic impedance gradient and so on were calculated and were used to identify and describe the lithology and fluid.The PP-PS joint pre-stack inversion method can improve the reliability and accuracy of the inversion,3D multi-wave seismic data processing of the field data proved the suitability of the method.
引文
[1]李录明,罗省贤.多波AVA及岩性预测.石油地球物理勘探,1996,31(2):190～204
[2]雍杨,李录明,罗省贤.多波AVA地层参数反演.矿物岩石,2003,23(1):117～120
[3]雍杨,李录明,罗省贤等.TI介质多波AVA方程及参数反演.石油物探,2004,43(1):11～15
[4]罗省贤,李录明.三维叠前深度偏移速度模型建立方法.石油物探,1999,38(4):1～6
[5]李录明,罗省贤.P-SV转换波速度分析方法及解释方法.石油地球物理勘探,1995,30(1):66～74
[6]罗省贤,李录明,陈春继.VTI介质多波速度与各向异性系数求取及应用.物探化探计算技术,2005,27(3):214～218
[7]王明春,李录明,罗省贤.TI介质多波AVA联合反演岩性参数方法及应用.天然气工业,2007,27(4):49～52
[8]彭真明等.叠前弹性阻抗在储层气水识别中的应用.天然气工业,2007,27(4):43～45
[9]Goodway W,Chen Tand Downton J.I mproved AVO fluid detection and lithology discri mination using Lame petrophysical parameters:“λρ”,“μρ”,“λ/μflu-id stack”,from P and S inversions.SEG Technical Program Expanded Abstracts,1997,16:183～186
[10]Stewart R R.Joint P and P-SV inversion.The CREWES Research Report,1990,3:112～115
[11]Mahmoudian F and Margrave G F.Three parameter AVOinversion with PP and PS data using offset bin-ning.SEG Technical Program Expanded Abstracts,2004,23:240～243
[12]Si mmons J L and Backus M M.Waveform-based AVOinversion and AVO prediction-error.Geophys-ics,1996,61(6):1575～1588
[2]雍杨,李录明,罗省贤.多波AVA地层参数反演.矿物岩石,2003,23(1):117～120
[3]雍杨,李录明,罗省贤等.TI介质多波AVA方程及参数反演.石油物探,2004,43(1):11～15
[4]罗省贤,李录明.三维叠前深度偏移速度模型建立方法.石油物探,1999,38(4):1～6
[5]李录明,罗省贤.P-SV转换波速度分析方法及解释方法.石油地球物理勘探,1995,30(1):66～74
[6]罗省贤,李录明,陈春继.VTI介质多波速度与各向异性系数求取及应用.物探化探计算技术,2005,27(3):214～218
[7]王明春,李录明,罗省贤.TI介质多波AVA联合反演岩性参数方法及应用.天然气工业,2007,27(4):49～52
[8]彭真明等.叠前弹性阻抗在储层气水识别中的应用.天然气工业,2007,27(4):43～45
[9]Goodway W,Chen Tand Downton J.I mproved AVO fluid detection and lithology discri mination using Lame petrophysical parameters:“λρ”,“μρ”,“λ/μflu-id stack”,from P and S inversions.SEG Technical Program Expanded Abstracts,1997,16:183～186
[10]Stewart R R.Joint P and P-SV inversion.The CREWES Research Report,1990,3:112～115
[11]Mahmoudian F and Margrave G F.Three parameter AVOinversion with PP and PS data using offset bin-ning.SEG Technical Program Expanded Abstracts,2004,23:240～243
[12]Si mmons J L and Backus M M.Waveform-based AVOinversion and AVO prediction-error.Geophys-ics,1996,61(6):1575～1588
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