三维叠前深度偏移技术在江苏CB地区的应用效果
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摘要
当地下地质构造复杂或介质速度横向变化剧烈时,必须做叠前深度偏移。影响叠前深度偏移效果的两个关键因素是速度—深度模型的精确性及输入道集数据的质量。围绕这两方面的内容,本文通过CB地区三维叠前深度偏移的试验和应用研究,建立了一套适合江苏油田特点的处理流程,总结出了做好三维叠前深度偏移处理工作的八项技术要点,包括三维建模、前期数据准备、井资料的使用、浅层速度分析、优化速度模型、模型平滑、空间假频抑制及孔径选择等。实际资料处理及钻探的结果均证实这套技术组合及流程是有效的。
It should do prestack depth migration when the underground geologic structure is complex or lateral velocity variation of media is violent.There are two key factors affecting the effects of prestack depth migration:accuracy of velocity-depth model and quality of input gather data.About these two aspects,the paper created a set of processing flow suitable for the characters of Jiangsu Oilfield by the tests and application study of 3D prestack depth migration in CB area,and summarized eight technical key-points well-doing 3D prestack depth migration,including 3D model-building,data preparation in earlier stage,usage of drilling data,analysis of shallow velocity,optimization of velocity model,model smoothing,suppression of spatial alias and aperture choosing.The practical data processing and drilling results showed that this set of technical composition and flow are effective.
It should do prestack depth migration when the underground geologic structure is complex or lateral velocity variation of media is violent.There are two key factors affecting the effects of prestack depth migration:accuracy of velocity-depth model and quality of input gather data.About these two aspects,the paper created a set of processing flow suitable for the characters of Jiangsu Oilfield by the tests and application study of 3D prestack depth migration in CB area,and summarized eight technical key-points well-doing 3D prestack depth migration,including 3D model-building,data preparation in earlier stage,usage of drilling data,analysis of shallow velocity,optimization of velocity model,model smoothing,suppression of spatial alias and aperture choosing.The practical data processing and drilling results showed that this set of technical composition and flow are effective.
引文
[1]陈祖传等.美国勘探地球物理学家学会第66届年会论文集.北京:石油工业出版社,1997
[2]渥.伊尔马滋.地震数据处理.北京:石油工业出版社,1994
[3]熊翥著.地震数据数字处理应用技术.石油工业出版社,1993
[4]Versteeg R S.Sensitivity of prestack depth migration to the velocity mode1.Geophysics,1993,58(6):873～882
[5]Geoltrain S and Brac J.Can we image complex struc-tures with first-arrival traveltime?Geophysics,1993,58(4):564～575
[2]渥.伊尔马滋.地震数据处理.北京:石油工业出版社,1994
[3]熊翥著.地震数据数字处理应用技术.石油工业出版社,1993
[4]Versteeg R S.Sensitivity of prestack depth migration to the velocity mode1.Geophysics,1993,58(6):873～882
[5]Geoltrain S and Brac J.Can we image complex struc-tures with first-arrival traveltime?Geophysics,1993,58(4):564～575
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