低幅构造分析方法研究——以塔里木盆地三道桥构造为例
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摘要
提高地震采集和处理的分辨率,建立高精度的地震速度场和高分辨率的地震反演资料,是研究低幅度构造的有效方法。根据研究区以往的地震、地质资料,从地震速度研究着手,通过对大量地震速度谱分析,用平滑平均速度的方法建立了精细的三维变速场,并利用高阶统计量方法提取地震子波进行高分辨率地震反演,大大提高了薄储层的解释精度。通过分析研究重新落实了三道桥构造,对低幅度构造研究取得了较好的效果,为该区下一步油气勘探井位部署提供了可靠依据。
To improve the seismic acquisition and process resolution, to build high-accuracy seismic velocity field and high-resolution seismic inversion data are effective ways of studying low amplitude structure. On the basis of previous seismic and geology data in that area, this paper, beginning from the velocity analysis, the establishment of fine varied velocity field is discussed by studying a lot of seismic velocity spectrum data and smooth and average velocity method is used to build a fine 3D velocity variation field, and a high order statistical method is used to extract a seismic wavelet for a high resolution inversion, by which the precision of thin layer interpretation is raised. Sandaoqiao structure is re-established through analysis, and better result is achieved in the low amplitude structure, thus reliable basis is provided for well location arrangement in further oil and gas exploration.
To improve the seismic acquisition and process resolution, to build high-accuracy seismic velocity field and high-resolution seismic inversion data are effective ways of studying low amplitude structure. On the basis of previous seismic and geology data in that area, this paper, beginning from the velocity analysis, the establishment of fine varied velocity field is discussed by studying a lot of seismic velocity spectrum data and smooth and average velocity method is used to build a fine 3D velocity variation field, and a high order statistical method is used to extract a seismic wavelet for a high resolution inversion, by which the precision of thin layer interpretation is raised. Sandaoqiao structure is re-established through analysis, and better result is achieved in the low amplitude structure, thus reliable basis is provided for well location arrangement in further oil and gas exploration.
引文
[1]马涛.塔里木盆地速度场的建立及应用[J].石油地球物理勘探,1996,(3):382~393.
[2]马海珍,雍学善,杨午阳等.地震速度场建立与变速成图的一种方法[J].石油地球物理勘探,2002,(1):53~59.
[3]吕景贵,刘振彪,牛滨华等.一种叠加速度分析新方法[J].石油物探,2000,(3):36~42.
[4] Reshel M.The use of 3-D prestack depth imaging to estimate layer velocities and reflector positions [J].Geophysics,1997,62(1):206~210.
[5] Whitmore N D, Garing J D.Interval velovity estimation using iterative prestack depth migration in the constant angle domain [J].TheLeading Edge,1993,12(7):757~762.
[6]尹成,伍志明,邓怀群.高阶统计量方法在地震勘探中的应用[J].地球物理学进展,2003,(3):546~550.
[7]吕江宁,沈正康,王敏.川滇地区现代地壳运动速度场和活动块体模型研究[J].地震地质,2003,(4):543~554.
[2]马海珍,雍学善,杨午阳等.地震速度场建立与变速成图的一种方法[J].石油地球物理勘探,2002,(1):53~59.
[3]吕景贵,刘振彪,牛滨华等.一种叠加速度分析新方法[J].石油物探,2000,(3):36~42.
[4] Reshel M.The use of 3-D prestack depth imaging to estimate layer velocities and reflector positions [J].Geophysics,1997,62(1):206~210.
[5] Whitmore N D, Garing J D.Interval velovity estimation using iterative prestack depth migration in the constant angle domain [J].TheLeading Edge,1993,12(7):757~762.
[6]尹成,伍志明,邓怀群.高阶统计量方法在地震勘探中的应用[J].地球物理学进展,2003,(3):546~550.
[7]吕江宁,沈正康,王敏.川滇地区现代地壳运动速度场和活动块体模型研究[J].地震地质,2003,(4):543~554.
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