密点速度分析技术在塔河油田西南部低幅构造中的应用
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摘要
随着地震勘探精度的不断提高,常规速度分析方法已不能满足精细构造分析、储层描述及各向异性研究等对速度精度的要求.研究应用高密度叠前速度求取技术,自动拾取地震记录规则波的走时、振幅、波场相干性及炮点射线参数、检波点射线参数等信息,求取不同偏移距道上波峰时间处的反射波速度,并针对地质条件,采用空变时变速度滤波、频率滤波、倾角参数滤波等手段提高速度精度.将该技术应用于塔河油田西南部TFT地区1200km2叠前三维地震资料的精细速度分析,落实了主要目的层低幅度构造,确定了构造形态和要素;通过差异速度分析、AVO反射能量包络差及速度变化规律研究,对泥盆系东河砂岩进行了储层异常区带划分.
As the ever-increasing accuracy requirement for seismic survey,conventional velocity analysis methods have been shown failure in providing adequate accuracy of velocity for fine structural analysis,reservoir characterization,and anisotropic study.We adopted high density prestack velocity analysis technology to automatically pick the traveltime,amplitude,and coherency of the regular waves,as well as the ray parameters at shot and receiver to calculate the velocity of reflection at peaks for traces of different offset.To further improve the accuracy of velocity,measures such as spatially time-variant velocity filtering,frequency filtering,and dip filtering were used according to the geology.The method has been applied to calculate the detailed velocity on prestack 3-D data set from an area covering 1200km2 in TFT,Tahe Oilfield.From which,low relief structures of main targets and its geometry and features are determined.Furthermore,the reservoir intervals are delineated by differential interformation velocity analysis,envelope difference of AVO energy,and velocity variability study in the Devonian sandstone of Donghe Formamation.
As the ever-increasing accuracy requirement for seismic survey,conventional velocity analysis methods have been shown failure in providing adequate accuracy of velocity for fine structural analysis,reservoir characterization,and anisotropic study.We adopted high density prestack velocity analysis technology to automatically pick the traveltime,amplitude,and coherency of the regular waves,as well as the ray parameters at shot and receiver to calculate the velocity of reflection at peaks for traces of different offset.To further improve the accuracy of velocity,measures such as spatially time-variant velocity filtering,frequency filtering,and dip filtering were used according to the geology.The method has been applied to calculate the detailed velocity on prestack 3-D data set from an area covering 1200km2 in TFT,Tahe Oilfield.From which,low relief structures of main targets and its geometry and features are determined.Furthermore,the reservoir intervals are delineated by differential interformation velocity analysis,envelope difference of AVO energy,and velocity variability study in the Devonian sandstone of Donghe Formamation.
引文
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[14]刘丽峰,杨怀义等.三维精细构造解释的方法流程和关键技术[J].地球物理学进展,2006,21(3):864~871.
[15]刘洪林,朱秋影.基于叠前深度偏移的AVO反演及解释[J].地球物理学进展,2007,22(3):905~912.
[16]徐向华,杨勇,别爱芳.塔河油田石炭系三角洲微地震相研究[J]石油物探,2007,46(1):32~35.
[2]高静怀,毛剑,等.叠前地震资料噪声衰减的小波域方法研究.地球物理学报,2006,49(4):1155~1163.
[3]李振春,孙小东等.复杂地表条件下共反射面元(CRS)叠加方法研究[J].地球物理学报,2006,49(6):1794~1801.
[4]王典,刘财,等.反射法地震勘探噪声消除技术研究[J].地球物理学进展,2006,21(3):957~970.
[5]袁江华,刘洪,首皓,等.面向目标的叠前角度道集提取策略[J].石油物探,2007,46(4):334~338
[6]Sun C W,Wang H W,Ruben D.Martinez.Optimized 6th or-der NMO correction for long-offset seismic data[J].Ex-panded Abstracts of 72 th Annual Internat SEG Mtg,2002,2313~2316.
[7]Frederic Billetee,Gilles Lambare,Pascal Podvin.Velocity mac-romodel estimation by stereotomography[J].Expanded Ab-stracts of 67 th Annual Internat SEG Mtg,1997,1889~1992.
[8]Ravve I,Koren Z.Exponential asymptotically bounded veloci-ty model:Presented at the 74thAnnual International Meeting,SEG,2004.
[9]陈志德,李成斌,等.三维叠前深度偏移速度分析地卡洛自动层速度拾取[J].地球物理学报,2002,45(2):246~254.
[10]Alejandro A.Valenciano,Morgan Brown,guitton.Intervalvelocity estimation using dge-preserving regularization[J].Expanded Abstracts of 74 th Annual Internat SEG Mtg,2004,2431~2434.
[11]Zvi Koren and Igor Ravve.Constrained Velocity Inversion.Expanded Abstracts of 75thAnnual Interational SEG meet-ing,2005,2289~2292.
[12]孙开峰,叶勇.泛克里格法在三维地震资料变速成图中的应用[J].石油物探,37(2):112~117.
[13]杨军,王永刚,杨彦敏等.阿尔及利亚416a—417区块构造精细成图方法[J].石油物探,2007,46(3):294~301.
[14]刘丽峰,杨怀义等.三维精细构造解释的方法流程和关键技术[J].地球物理学进展,2006,21(3):864~871.
[15]刘洪林,朱秋影.基于叠前深度偏移的AVO反演及解释[J].地球物理学进展,2007,22(3):905~912.
[16]徐向华,杨勇,别爱芳.塔河油田石炭系三角洲微地震相研究[J]石油物探,2007,46(1):32~35.
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