几种地震波叠后深度偏移方法的比较
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摘要
地震波深度偏移方法是解决复杂地质构造成像的有力手段。为了研究复杂构造和速度分布条件下地震资料的叠后精确成像方法,分别采用相移加内插法、分裂步傅里叶法、傅里叶有限差分法和逆时偏移法对复杂的Marmousi模型进行叠后深度域偏移试验,计算结果表明,逆时偏移法具有最佳的成像效果,使得复杂构造成像清晰,绕射波场等完全收敛,计算精度和计算效率较高,是一种高精度的叠后深度偏移方法。
Seismic wave depth migration method is a vital means for imaging complex subsurface structures.In order to study the accuracy of poststack seismic imaging methods under conditions of complex structure and velocity distribution,we tested four poststack depth migration methods:phase-shift plus interpolation method,split-step Fourier migration,Fourier finite-difference migration,and reverse-time migration on Marmousi model.Results show that the reverse-time migration method has the best imaging effect,which makes complex structure clear and definite,diffracted waves are completely converged,and its computing precision and efficiency is also high.Thus this method is the best choice for depth migration method.
Seismic wave depth migration method is a vital means for imaging complex subsurface structures.In order to study the accuracy of poststack seismic imaging methods under conditions of complex structure and velocity distribution,we tested four poststack depth migration methods:phase-shift plus interpolation method,split-step Fourier migration,Fourier finite-difference migration,and reverse-time migration on Marmousi model.Results show that the reverse-time migration method has the best imaging effect,which makes complex structure clear and definite,diffracted waves are completely converged,and its computing precision and efficiency is also high.Thus this method is the best choice for depth migration method.
引文
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2张美根,王妙月.各向异性弹性波有限元叠前逆时偏移[J].地球物理学报,2001,44(5):711～719
3底青云,王妙月.弹性波有限元逆时偏移技术研究[J].地球物理学报,1997,40(4):570～579
4薛东川,王尚旭.波动方程有限元叠前逆时偏移[J].石油地球物理勘探,2008,43(1):17～21
5Gazdag J.Sguazzero P.Migration of seismic data by phase shift plus interpolation[J].Geophysics,1984,49(2):124～131
6Stoffa P L,Fokkema J T,Freire R M,et al.Split-step Fourier migration[J].Geophysics,1990,55(4):410～421
7Stolt R H.Migration by Fourier transform[J].Geo-physics,1978,43(1):23～48
8Ristow D,Ruhl T.Fourier finite-difference migration[J].Geophysics,1994,59(12):1882～1893
9陈可洋.声波完全匹配层吸收边界条件的改进算法[J].石油物探,2009,48(1):76～79.
10陈可洋,刘洪林,杨微,等.随机介质模型的改进方法及应用[J].大庆石油地质与开发,2008,27(5):124～126,131
11张钋,李幼铭,刘洪.几类叠前深度偏移方法的研究现状[J].地球物理学进展,2000,15(2):30～39
12陈可洋,杨微.优化的三维地震波旁轴近似吸收边界条件[J].勘探地球物理进展,2009,32(3):179～181,206
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