基于射线追踪的CMP相干速度反演技术在渤海油田的应用
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摘要
利用钻、测井资料对地震层位进行标定,或者确定地震层位的深度,以及将地震等t0图转换成深度构造图,均需要进行时深转换。时深转换的精度取决于速度的精度。通常使用H-T函数法、井间简单数学插值法和DMO速度场法,获取时深转换的速度场,但是由此获得的速度精度均不能满足工作的需要。本文基于射线追踪的CMP相干速度反演技术获取的速度场,在渤海油田JZ251地区取得了成功。CMP相干反演的速度误差分析表明,此类误差是一种全区比较稳定的误差,可以通过相应的校正得到消除。
The time to depth conversion is needed when using drilling data and well logging data to calibrate seismic horizons,to determine the depth of the horizons and to convert seismic t0 contour maps to structure maps in depth.The accuracy of the time to depth conversion depends on the accuracy of the velocity.The velocity field for time to depth conversion is usually acquired by using the H-T function method,inter-well mathematical interpolation method and DMO velocity field method,but the accuracy of the velocity field acquired by the three methods can not meet the need of E&P tasks.It was shown in this paper that the velocity field which was based on ray tracing CMP coherent velocity inversion technique was successfully applied in JZ251 area in Bohai Oil-field.The CMP coherent inversion velocity error analysis indicates that the error is a stable and global error and it can be removed by corresponding correction.
The time to depth conversion is needed when using drilling data and well logging data to calibrate seismic horizons,to determine the depth of the horizons and to convert seismic t0 contour maps to structure maps in depth.The accuracy of the time to depth conversion depends on the accuracy of the velocity.The velocity field for time to depth conversion is usually acquired by using the H-T function method,inter-well mathematical interpolation method and DMO velocity field method,but the accuracy of the velocity field acquired by the three methods can not meet the need of E&P tasks.It was shown in this paper that the velocity field which was based on ray tracing CMP coherent velocity inversion technique was successfully applied in JZ251 area in Bohai Oil-field.The CMP coherent inversion velocity error analysis indicates that the error is a stable and global error and it can be removed by corresponding correction.
引文
[1]陆基孟.地震勘探原理.山东东营:石油大学出版社,1993,9～95
[2]Practical Velocity Modeling in the Landmark Envi-ronment,Landmark,2004
[3]刘文卿.提高地震速度场精度的一种方法.石油地球物理勘探,2002,37(增刊):176～178
[4]易远元,姜建莉,赵殿君.基于模型层析法的地震速度研究.江汉石油学院学报,2003,25(1):1～3
[5]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.石油地球物理勘探,2002,37(1):53～59
[6]吕景贵,刘振彪等.一种叠加速度分析新方法.石油物探,2000,(3):36～42
[7]李庆忠.走向精确勘探的道路.北京:石油工业出版社,1993
[8]李正文,赵志超.地震勘探资料解释.北京:地质出版社,1988
[9]罗涛,刘传川.构造复杂区变速成图方法探讨.江汉石油学院学报,2004.12,26(4):80～81
[10]Landa E et al.A method for determination of velocity and depth from seismic reflection data.GeophysicalProspecting,1988,36:223～243
[2]Practical Velocity Modeling in the Landmark Envi-ronment,Landmark,2004
[3]刘文卿.提高地震速度场精度的一种方法.石油地球物理勘探,2002,37(增刊):176～178
[4]易远元,姜建莉,赵殿君.基于模型层析法的地震速度研究.江汉石油学院学报,2003,25(1):1～3
[5]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.石油地球物理勘探,2002,37(1):53～59
[6]吕景贵,刘振彪等.一种叠加速度分析新方法.石油物探,2000,(3):36～42
[7]李庆忠.走向精确勘探的道路.北京:石油工业出版社,1993
[8]李正文,赵志超.地震勘探资料解释.北京:地质出版社,1988
[9]罗涛,刘传川.构造复杂区变速成图方法探讨.江汉石油学院学报,2004.12,26(4):80～81
[10]Landa E et al.A method for determination of velocity and depth from seismic reflection data.GeophysicalProspecting,1988,36:223～243
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