泊松阻抗地震属性在刚果A区块油气检测中的应用
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摘要
叠前地震反演是根据振幅随炮检距或入射角的变化规律所反映的地下岩性和孔隙流体性质,来预测油气和估计地层岩性参数的一项技术,但直接应用叠前地震反演的结果还存在反演的属性随着地层埋深的增加而存在明显的压实背景趋势的影响,以及分析描述储层孔隙内流体特征时,经常存在单个属性难以有效识别孔隙内流体类型的不足。泊松阻抗是由叠前地震反演结果推导出的属性,它将泊松比和密度两种属性融合为单一的泊松阻抗属性,其泊松阻抗属性有助于实现将含油气储层从围岩中进行有效分离,达到识别砂岩孔隙内流体的目的。将泊松阻抗作为一种新的油气检测地震属性应用于西非深水勘探区块的烃类检测中,其钻前预测与实钻结果完全一致,从而证实了泊松阻抗钻前预测油气的可靠性和准确性,取得了较好的应用效果,显示了泊松阻抗作为一种新的油气检测地震属性的独特作用。
Amplitude versus offset or incidence angle variations phenomenon could reflect the properties of lithology and fluid underground.Prestack seismic inversion is a technique using AVO to detect oil and gas distribution and calculate lithologic parameters of target formations.However,the results of prestack inversion are always influenced by the compaction trend which increases versus the buried depth.Moreover,one single attribute is difficult to identify the reservoir fluid type.poisson's impedance is an attribute derived from prestack inversion results,which integrates poisson's ratio and density.It is useful to separate oil-bearing reservoir from background rock,thus,it could help to identify the fluid in sandstone pore.poisson impedance is used as a new seismic attribute to detect oil and gas in deep water exploration area in west-Africa,the results fit well with the drilling data,which verifies that poisson's impedance is a reliable and precise attribute and it plays a unique role in oil and gas detection.
Amplitude versus offset or incidence angle variations phenomenon could reflect the properties of lithology and fluid underground.Prestack seismic inversion is a technique using AVO to detect oil and gas distribution and calculate lithologic parameters of target formations.However,the results of prestack inversion are always influenced by the compaction trend which increases versus the buried depth.Moreover,one single attribute is difficult to identify the reservoir fluid type.poisson's impedance is an attribute derived from prestack inversion results,which integrates poisson's ratio and density.It is useful to separate oil-bearing reservoir from background rock,thus,it could help to identify the fluid in sandstone pore.poisson impedance is used as a new seismic attribute to detect oil and gas in deep water exploration area in west-Africa,the results fit well with the drilling data,which verifies that poisson's impedance is a reliable and precise attribute and it plays a unique role in oil and gas detection.
引文
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[14]苗永康,王玉梅,吴国忱,等.济阳坳陷Y3地区基于地震资料的流体识别方法[J].石油物探,2010,49(1):62-67.MIAO Y K,WANG Y M,WU G C,et al.Study on fluid identification method based on seismic data in Y3area of Jiyang Depression[J].GPP,2010,49(1):62-67.(In Chinese)
[15]WYLLIE M R J,GREGORY A R,GARDNER L W.Elastic wave velocities in heterogeneous and porous media[J].Geophysics,1956,21(1):41-70.
[2]田振平.叠前波阻抗反演方法[J].石油地球物理勘探,1995,30(2):192-200.TIAN Z P.Wave impedance inversion before stack[J].OGP,1995,30(2):192-200.(In Chinese)
[3]沈凤,钱绍新,刘雯林,等.AVO多参数反演在气层检测和储层定量研究中的应用[J].石油学报,1994,15(2):11-20.SHEN F,QIAN S X,LIU W L,et al.The application of AVO multiple parameter inversion in gas sand detection and reservoir quantitative examination[J].Acta Petrolei Sinica,1994,15(2):11-20.(In Chinese)
[4]MUKERJI T,JORSTAND A,AVSETH P,et al.Mapping lithofacies and pore-fluid probabilities in a North SEA reservoir seismic inversions and statistical rock physics[J].Geophysics,2001,66(4):988-1001.
[5]LATIMER R B,DAVISON R R.An interpreter's guide to understanding and working with seismic-derived acoustic impedance data[J].The Leading Edge,2000,19(3):242-256.
[6]孙豪志,范侦祥.弹性波介质中纵、横波速度反演[J].石油地球物理勘探,1994,29(6):678-684.SUN H Z,FAN Z X.P and S-wave velocity inversions in elastic medium[J].OGP,1994,29(6):678-684.(In Chinese)
[7]魏超,郑晓东,李劲松.非线性AVO反演方法研究[J].地球物理学报,2011,54(8):2110-2116.WEI C,ZHENG X D,LI J S.A study on nonlinear AVO inverse method[J].Chinese J Geophys,2011,54(8):2110-2116.(In Chinese)
[8]COOKE D A,SCHNEIDER W A.Generalized linear inversion of reflection seismic data[J].Geophysics,1983,48(6):665-676.
[9]CONNOLLY P.Elastic impedance[J].The Leading Edge,1999,18(4):438-453.
[10]QUAKENBUSH M.Poisson impedance[J].The Leading Edge,2006,25(2):128-138.
[11]孙喜新.泊松阻抗及其在平湖砂岩气藏检测中的应用[J].石油地球物理勘探,2008,43(6):699-703.SUN X X.Poisson impedance and application to detect Pinghu sandstone gas reservoir[J].OGP,2008,43(6):699-703.(In Chinese)
[12]LINDSETH R O.Synthetic sonic logs-a process for stratigraphic interpretation[J].Geophysics,1979,44(1):3-26.
[13]CASTAGNA J P,BATZLE M L,Eastwood R L.Relationships between compression and shear-wave velocities in elastic silicate rocks[J].Geophysics,1985,50(2):571-581.
[14]苗永康,王玉梅,吴国忱,等.济阳坳陷Y3地区基于地震资料的流体识别方法[J].石油物探,2010,49(1):62-67.MIAO Y K,WANG Y M,WU G C,et al.Study on fluid identification method based on seismic data in Y3area of Jiyang Depression[J].GPP,2010,49(1):62-67.(In Chinese)
[15]WYLLIE M R J,GREGORY A R,GARDNER L W.Elastic wave velocities in heterogeneous and porous media[J].Geophysics,1956,21(1):41-70.
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