叠前AVO技术在番禺天然气区的应用实例研究
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摘要
珠江口盆地番禺天然气区PY35-2圈闭面积大,受断层控制分为南块和北块。在该地区开展了地震储层含气性预测方法的研究与应用工作。研究结果表明:叠前AVO属性能准确预测PY35-2圈闭南块储层的含气性,这一点南块的验证井PY35-2-5井已经证实;而位于圈闭北块的验证井PY35-2-3井实钻结果表明圈闭北块含气砂岩的AVO特征与南块含气储层特征不一致。为进一步研究该区南北块AVO响应特征,研究了储层泊松比及反射系数特征与AVO类型的对应性,从理论上分析落实了南北块含气砂岩的AVO特征。研究认为,番禺天然气区PY35-2圈闭的AVO特征存在多样化的特点。
Because the trap area and the sandstone reservoir transverse changing of Panyu Gas Field were very big,it was separated into north and south parts by fault.In this paper,the study and application in gas detection were carried out.The result shows that the transverse changes of sandstone reservoir are influenced by fault and the change is very big.Pre-stack AVO attribute can detect the gas accurately.And the Test Well 5 is proven for this detection.But the Test Well 3 proves the AVO character of north which is difference with the one in the south.The Poisson's ratio and reflection coefficients of the sandstone are studied by using the geophysical theory,of which the north is varied with the one in the south and the AVO characters in both regions,the AVO characters are in Panyu Gas Field.
Because the trap area and the sandstone reservoir transverse changing of Panyu Gas Field were very big,it was separated into north and south parts by fault.In this paper,the study and application in gas detection were carried out.The result shows that the transverse changes of sandstone reservoir are influenced by fault and the change is very big.Pre-stack AVO attribute can detect the gas accurately.And the Test Well 5 is proven for this detection.But the Test Well 3 proves the AVO character of north which is difference with the one in the south.The Poisson's ratio and reflection coefficients of the sandstone are studied by using the geophysical theory,of which the north is varied with the one in the south and the AVO characters in both regions,the AVO characters are in Panyu Gas Field.
引文
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[3]杨文采.地球物理反演理论和方法[M].北京:地质出版社,1997.
[4]雍扬.TI介质多波AVA方程及参数反演[J].石油物探,2004,44(1):11～16.
[5]孟宪军,姜秀娣.叠前AVA广义非线性纵、横波速度反演[J].石油地球物理勘探,2004,39(6):645～650.
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[7]Castagna J P,Herbert WS,Douglas J F.Framework for AVO gradient and intercept interpretation[J].Geophysics,1998,63:948～956.
[8]Koefoed O.On the effect of Poisson's rations of rock strata on the reflection coefficients of plane waves[J].Geophysical Prospection,1955,(3):381～387.
[9]Castagna J P,Batzle ML,Eastwood R L.Relationships between compressional-wave and shear-wave velocities in clastic silicate rocks[J].Geophysics,1985,50:571～581.
[2]殷八斤,曾灏,杨在岩.AVO技术的理论和实践[M].北京:石油工业出版社,1995.191～325.
[3]杨文采.地球物理反演理论和方法[M].北京:地质出版社,1997.
[4]雍扬.TI介质多波AVA方程及参数反演[J].石油物探,2004,44(1):11～16.
[5]孟宪军,姜秀娣.叠前AVA广义非线性纵、横波速度反演[J].石油地球物理勘探,2004,39(6):645～650.
[6]Shuey R T.Asi mplification of the zoeppritz equations[J].Geophysics,1985,50(4):609～634.
[7]Castagna J P,Herbert WS,Douglas J F.Framework for AVO gradient and intercept interpretation[J].Geophysics,1998,63:948～956.
[8]Koefoed O.On the effect of Poisson's rations of rock strata on the reflection coefficients of plane waves[J].Geophysical Prospection,1955,(3):381～387.
[9]Castagna J P,Batzle ML,Eastwood R L.Relationships between compressional-wave and shear-wave velocities in clastic silicate rocks[J].Geophysics,1985,50:571～581.
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