复杂地表有限差分波动方程向上基准面校正
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
对于地表高程变化剧烈、近地表速度很高的山地地震数据,采用常规高程静校正已不能满足基准面校正处理的要求,而波动方程基准面校正则可以实现准确的基准面校正。波动方程基准面校正采用两步法来实现,即先在共炮点道集上将检波点延拓到基准面,然后在共检波点道集上将炮点延拓到基准面。给出了非水平地表速度模型和模拟西部某地区复杂地表速度模型的2个算例,应用频率空间域有限差分算子进行了波场延拓。非水平地表速度模型的波场延拓结果表明,算法是可行的;复杂地表速度模型的计算结果表明,向上波动方程基准面校正方法能够正确地消除复杂近地表结构对数据的影响。分别对向上波动方程基准面校正和常规高程静校正后的数据进行了叠加处理和叠后深度偏移处理,结果表明,经过向上波动方程基准面校正后的成像结果较之常规高程静校正结果更为精确。
To the seismic data acquired in the mountainous area, of which the surface elevation varies intensely and the ve- locity near the surface is high,the conventional elevation static correction cannot meet the request of the datum cor- rection;only the wave equation datum correction can real- ize it exactly.Wave equation datum correction is based on the classical two steps methods,propagating the datum to the datum surface in the CSP gather and CRP gather suc- cessively.The result of the calculation with the finite difference algorithm in the frequency-space domain,which is based on the complex surface model,indicates that the upward wave equation datum correction could remove the effect of the complex structure near the surface.The result based on upward wave equation datum correction could im- age the underground structure more correctly in comparison with the one based on elevation static correction.
引文
1 Beasley C,Lynn W.The zero-velocity layer:Migration from irregular surfaces[J].Geophysics,1992,57(11):1 435~1 443
    2 Berryhill R T.Wave equation datuming[J].Geophysics,1979,44(8):1 329~1 344
    3 Berryhill R T.Wave-equation datuming before stack[J].Geophysics,1984,49(11):2 064~2 066
    4 Shtivelman V,Canning A.Datum correction by wave e-
    ??quation extrapolation[J].Geophysics,1988,53(10):1 311~1 322
    5 Yilmaz O,Lucas D.Prestack layer replacement[J].Geophysics,1986,51(7):1 355~1 369
    6 Reshef R.Depth migration from irregular surfaces with depth extrapolation methods[J].Geophysics,1991,56(1):119~122
    7 杨锴.非水平观测面有限差分叠前波动方程基准面校正[学位论文][D].上海:同济大学,1999
    8 杨锴,王华忠.程玖兵,等.非水平观测面有限差分叠前波动方程基准面校正[J].石油地球物理勘探,2002,37(2):154~162
    9 王华忠,马在田,曹景忠.优化系数傍轴近似方程三维一步法偏移[J].石油地球物理勘探,1998,33(2):170~184
    10 方伍宝,李满树,孙爱萍,等.基于 Born 近似的波动方程静校正技术[J].石油物探,2004,43(1):26~29
    11 程玖兵,王华忠,马在田.频率-空间域有限差分法叠前深度偏移[J].地球物理学报,2001,44(3):389~395
    12 何英,王华忠,马在田,等.复杂地形条件下波动方程叠前深度成像[J].勘探地球物理进展,2002,25(3):13~19
    13 马在田.地震成像技术有限差分法偏移[M].北京:石油工业出版社,1989.205
    14 程玖兵,王华忠,马在田.带误差补偿的有限差分叠前深度偏移方法[J].石油地球物理勘探,2001,36(4):408~413

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心