AVO约束稀疏脉冲反演技术在濮城油田储层预测中的应用
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摘要
AVO约束稀疏脉冲反演技术相对于普遍应用的弹性阻抗反演(EI)能够生成实际的岩石属性,反演结果可以直接用于后续的油藏描述研究和地震解释。在AVO正演模拟、角道集数据分析以及测井数据进行含气储层敏感参数分析的基础上,通过应用Aki-Richards近似方程对濮城油田沙一段含气储层进行了AVO约束稀疏脉冲反演研究。研究表明,濮城油田沙一段含气储层为第三类AVO异常,纵、横波阻抗两参数联合可以有效区分含气储层。通过反演结果直接提取了沙一段含气砂岩的平面分布特征和剖面特征,结果表明,AVO约束稀疏脉冲反演技术对于储层的定量预测具有较好的实用性。
Compared with elastic impedance inversion,AVO constrained sparse spike inversion could provide practical rock attribute,the result could be applied directly for reservoir characterization and seismic interpretation.Based on AVO forward modeling,AVO response analysis of partical stack seismic data and parameters of sensitiveness analysis of gas reservoir,AVO constrained sparse spike inversion was applied in Es1 gas reservoir discrimination of Pucheng Oilfield by using Aki-Richards approximation,The result shows that AVO response of Es1 gas reservoir is third class AVO abnormity,gas reservoir could be discriminated by P-impedance and S-impedance simultaneously.The plane distributive and cross sectional characters of Es1 gas reservoir are discriminated directly with the inversion result.The research shows that AVO constrained sparse spike inversion is practical for the quantitative discrimination of reservoirs.
Compared with elastic impedance inversion,AVO constrained sparse spike inversion could provide practical rock attribute,the result could be applied directly for reservoir characterization and seismic interpretation.Based on AVO forward modeling,AVO response analysis of partical stack seismic data and parameters of sensitiveness analysis of gas reservoir,AVO constrained sparse spike inversion was applied in Es1 gas reservoir discrimination of Pucheng Oilfield by using Aki-Richards approximation,The result shows that AVO response of Es1 gas reservoir is third class AVO abnormity,gas reservoir could be discriminated by P-impedance and S-impedance simultaneously.The plane distributive and cross sectional characters of Es1 gas reservoir are discriminated directly with the inversion result.The research shows that AVO constrained sparse spike inversion is practical for the quantitative discrimination of reservoirs.
引文
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[2]Zoeppritz K,Erdbebenwellen V B.On the reflection and penetration of seismic waves through unstable layers[J].Goettinger Nachr,1919,1:66～84.
[3]Frasier C W.Discrete time solution of plane P-SV waves in a plane layered medium[J].Geophysics,1970,35(2):197～219.
[4]Connolly P.Elastic impedance[J].The Leading Edge,1999,18(4):438～452.
[5]Helgesen J,Magnus I,Prosser S.Comparison of constrained sparse spike and stochastic inversion for porosity prediction at Kristinfield[J].The Leading Edge,2000,19(4):400～407.
[6]Quakenbush M,Shang B,Tuttle C.Poisson impedance[J].The Leading Edge,2006,25(2):128～138.
[7]甘利灯,赵邦六,杜文辉,等.弹性阻抗在岩性与流体预测中的潜力分析[J].石油物探,2005,44(5):504～508.
[8]Aki K I,Richards P G.Quantitative Seismology:Theory and Methods[M].San Francisco:W H Freeman and Company,1980.
[9]Fred J H.地震振幅解释[M].北京:石油工业出版社,2006.
[10]Rutherford S R,Williams R H.Amplitude-versus-offset variations in gas sands[J].Geophysics,1989,54(6):680～688.
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