起伏地表地震波正演数值模拟
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摘要
常规起伏地表地震波数值模拟均将地表以上的介质视为真空介质来处理,而这与实际情况不符。为解决这一问题,将地表以上介质视为声学介质,使地震波在该介质中以350m/s的速度传播。以两层起伏地表速度模型为例,分别采用声波和各向同性弹性波波动方程进行正演数值模拟,并与常规基于真空介质假设的计算结果进行对比,结果表明,基于声学假设的模拟记录可以更加有效地模拟真实的数据采集,并且反射波同向轴具有更好的连续性。
General seismic wave numerical simulation with relief surface treats the medium above the surface as vacuum medium,and it is different with practical situation.In order to solve the above problems,the paper treats the medium above the surface as acoustic medium with propagating acoustic velocity of 350m/s.Take two-layer velocity model with relief surface as example,by using acoustic wave equation and isotropic elastic wave equation to do the numerical simulation,respectively,and comparing with general computational results based on vacuum medium hypothesis.The results show that the simulating records based on acoustic wave hypothesis can be effectively simulated the practical data,and the reflective wave has better property of consistence.
General seismic wave numerical simulation with relief surface treats the medium above the surface as vacuum medium,and it is different with practical situation.In order to solve the above problems,the paper treats the medium above the surface as acoustic medium with propagating acoustic velocity of 350m/s.Take two-layer velocity model with relief surface as example,by using acoustic wave equation and isotropic elastic wave equation to do the numerical simulation,respectively,and comparing with general computational results based on vacuum medium hypothesis.The results show that the simulating records based on acoustic wave hypothesis can be effectively simulated the practical data,and the reflective wave has better property of consistence.
引文
[1]裴正林.任意起伏地表弹性波方程交错网格高阶有限差分法数值模拟[J].石油地球物理勘探,2004,39(6):629-634.
[2]陈伟.起伏地表条件下二维地震波场的数值模拟[J].勘探地球物理进展,2005,28(1):25-31.
[3]黄自萍,徐伶俐,周继顺.起伏地表声波方程的数值模拟[J].石油地球物理勘探,2006,41(3):275-280.
[4]熊晓军,贺振华,黄德济.起伏地表的单程波动方程地震叠前正演[J].天然气工业,2007,27(1):44-46.
[5]陈可洋.基于高阶有限差分的波动方程叠前逆时偏移方法[J].石油物探,2009,48(5):475-478.
[6]董良国,马在田,曹景忠.一阶弹性波方程交错网格高阶差分解法稳定性研究[J].地球物理学报,2000,43(6):856-864.
[7]王永刚,邢文军,谢万学,等.完全匹配层吸收边界条件的研究[J].中国石油大学学报(自然科学版),2007,31(1):19-24.
[8]王守东.声波方程完全匹配层吸收边界[J].石油地球物理勘探,2003,38(1):31-34.
[9]陈可洋.标量声波波动方程高阶交错网格有限差分法[J].中国海上油气,2009,21(4):232-236.
[2]陈伟.起伏地表条件下二维地震波场的数值模拟[J].勘探地球物理进展,2005,28(1):25-31.
[3]黄自萍,徐伶俐,周继顺.起伏地表声波方程的数值模拟[J].石油地球物理勘探,2006,41(3):275-280.
[4]熊晓军,贺振华,黄德济.起伏地表的单程波动方程地震叠前正演[J].天然气工业,2007,27(1):44-46.
[5]陈可洋.基于高阶有限差分的波动方程叠前逆时偏移方法[J].石油物探,2009,48(5):475-478.
[6]董良国,马在田,曹景忠.一阶弹性波方程交错网格高阶差分解法稳定性研究[J].地球物理学报,2000,43(6):856-864.
[7]王永刚,邢文军,谢万学,等.完全匹配层吸收边界条件的研究[J].中国石油大学学报(自然科学版),2007,31(1):19-24.
[8]王守东.声波方程完全匹配层吸收边界[J].石油地球物理勘探,2003,38(1):31-34.
[9]陈可洋.标量声波波动方程高阶交错网格有限差分法[J].中国海上油气,2009,21(4):232-236.
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