三维叠前深度偏移技术在四川盆地川中地区的应用
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摘要
川中地区地下地质情况复杂,高速盐岩层厚度的剧烈变化导致下覆地层构造形态发生畸变,为解决这一问题,对该地区三维地震资料进行了叠前深度偏移处理。文章介绍了克希霍夫叠前深度偏移的方法原理,阐述了如何建立较准确的深度-层速度模型这一关键技术,并将叠前深度偏移同叠前时间偏移的成像效果进行了对比分析。三维克希霍夫叠前深度偏移技术较好地解决了由于盐岩层的影响而不易获得准确的速度模型的难题,消除了速度异常,使地下构造形态得到了正确的成像,为落实地腹构造及圈闭规模、高点位置、断层展布和储层预测提供了可靠依据。
The underground geological conditions are very complicated in central Sichuan area.The abrupt change in salt-beds' thickness has led distorted structures underneath.3D pre-stack depth migration has been applied to the 3D seismic data in order to solve this problem.In this paper,the principle of Kirchhoff PSDM and the key technique for building accurate depth-interval velocity model are introduced.And the imaging results of the pre-stack time migration and those of the pre-stack depth migration are compared and analyzed.It is shown the 3D Kirchhoff PSDM can better overcome the adverse effects of salt rocks to obtain a correct velocity model,can remove the abnormal velocities and make the exact ima ging of underground structures.The migration results confirm the subsurface structure,the size of traps,the position of high points,the distribution of faults,and reservoir prediction.
The underground geological conditions are very complicated in central Sichuan area.The abrupt change in salt-beds' thickness has led distorted structures underneath.3D pre-stack depth migration has been applied to the 3D seismic data in order to solve this problem.In this paper,the principle of Kirchhoff PSDM and the key technique for building accurate depth-interval velocity model are introduced.And the imaging results of the pre-stack time migration and those of the pre-stack depth migration are compared and analyzed.It is shown the 3D Kirchhoff PSDM can better overcome the adverse effects of salt rocks to obtain a correct velocity model,can remove the abnormal velocities and make the exact ima ging of underground structures.The migration results confirm the subsurface structure,the size of traps,the position of high points,the distribution of faults,and reservoir prediction.
引文
[1]何光明,贺振华,黄德济,等.叠前时间偏移技术在复杂地区三维资料处理中的应用[J].天然气工业,2006,26(5):46-48.
[2]王翠华,何光明,朱敏,等.相对振幅保持在连片处理中的应用[J].石油地球物理勘探,2008,43(增刊):1218.
[3]李来林,吴清岭,何玉前,等.叠前深度成像技术分析及应用[J].石油地球物理勘探,2005,40(4):407410.
[4]徐基祥,崔化鹃.关于深度偏移的几个相关概念[J].石油地球物理勘探,2004,39(3):259-264.
[5]刘西宁,刘司红,马秀国,等.叠前深度偏移技术在焉耆盆地宝南地区的应用[J].石油物探,2006,45(2):197-201.
[6]渥·伊尔马滋,著.刘怀山,曹孟起,张进,等译.地震资料分析-地震资料处理、反演和解释(下册)[M].石油工业出版社,2006.
[2]王翠华,何光明,朱敏,等.相对振幅保持在连片处理中的应用[J].石油地球物理勘探,2008,43(增刊):1218.
[3]李来林,吴清岭,何玉前,等.叠前深度成像技术分析及应用[J].石油地球物理勘探,2005,40(4):407410.
[4]徐基祥,崔化鹃.关于深度偏移的几个相关概念[J].石油地球物理勘探,2004,39(3):259-264.
[5]刘西宁,刘司红,马秀国,等.叠前深度偏移技术在焉耆盆地宝南地区的应用[J].石油物探,2006,45(2):197-201.
[6]渥·伊尔马滋,著.刘怀山,曹孟起,张进,等译.地震资料分析-地震资料处理、反演和解释(下册)[M].石油工业出版社,2006.
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