高精度三维迭代叠加方法研究与应用
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摘要
速度分析和静校正精度高低影响地震数据叠加效果.常规速度分析是建立在时距曲线符合双曲线假设基础上,实际反射波旅行时并不总是满足双曲线规律,存在静校正误差,特别是中短波长静校正量会扭曲反射波双曲线,不准确正常时差无法使动校后CMP道集上地震道反射同相轴在叠前对齐.本文介绍高精度三维迭代叠加方法,是利用双方向倾角扫描方法建立三维模型道,利用CMP道集与模型道相关求取并消除剩余时差,经保振幅叠加后取得明显效果.
The precision of velocity analysis and static affects the result of stack.The conventional velocity analysis method assumes that two-way reflector travel-time curves versus offset are hyperbolic.In fact,actual two-way reflector travel-time curves often aren't hyperbolic.The static errors,especially the static errors of short or medium wave length can twist the hyperbolic curves of reflector travel-time.Inaccurate normal movement can't align the reflector events of CMP gather after NMO.We discuss a new method in this article.At first,we can build the model traces with the two directions dip scanning method,and then correlating between model traces and CMP gather traces we can calculate and eliminate the residual movement,at last,we stack the CMP gather data with a kind of preserving amplitude method.We have achieved good results in the seismic data of Junggar Basin.
The precision of velocity analysis and static affects the result of stack.The conventional velocity analysis method assumes that two-way reflector travel-time curves versus offset are hyperbolic.In fact,actual two-way reflector travel-time curves often aren't hyperbolic.The static errors,especially the static errors of short or medium wave length can twist the hyperbolic curves of reflector travel-time.Inaccurate normal movement can't align the reflector events of CMP gather after NMO.We discuss a new method in this article.At first,we can build the model traces with the two directions dip scanning method,and then correlating between model traces and CMP gather traces we can calculate and eliminate the residual movement,at last,we stack the CMP gather data with a kind of preserving amplitude method.We have achieved good results in the seismic data of Junggar Basin.
引文
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[2]程乾生.信号数字处理的数学原理[M].北京:石油工业出版社,1993,67-68.
[3]郑鸿明,彭勇,蒋琳.时变校正方法研究与应用[J].新疆地质,2009,1:89-90.
[4]马永军,王季.一种改进的时间域剩余动校正方法[J].石油物探,2010,49(3):245-247.
[5]陆基孟.地震勘探原理[M].东营:石油大学出版社,1996,162-163
[6]夏洪瑞,陈德刚,周开明.剩余动校正量的拾取与消除[J].石油地球物理勘探,1997,32(6):872-877.
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