东濮凹陷高密度各向异性自动速度分析
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摘要
提高复杂断块的成像精度,对复杂小断块进行精细刻画,其关键是提高速度分析的密度和精度。通过实际资料处理分析,在应用叠前时间偏移对复杂断块进行成像时,2%的偏移速度误差会对目的层的偏移成像效果产生明显影响,因此提高速度分析精度是高精度地震成像的关键。常规的速度分析方法是采用双曲线动校正公式进行速度分析,需要人工拾取速度,速度分析的密度受到限制,速度分析的质量也受人为因素的影响很大;另外,由于地下介质的各向异性的特点,反射旅行时间不再是双曲线,应用常规的双曲线动校正,在远移距出现校不平现象。通过所采用的高密度各向异性速度分析方法,可以进行高密度自动速度分析,同时也解决了各向异性引起的非双曲线动校正问题。
To enhance the imaging precision of complex fault blocks and carry on fine description of small complex fault blocks,the key is to increase the density and precision of velocity analysis.Through actual data processing analysis,2% of the imgration velocity error will exert obvious effect on the intended interval migration imaging results during the application of prestack time migration to imaging of complex fault blocks.Therefore,improving the accuracy of velocity analysis is the key to high-precision seismic imaging.The conventional velocity analysis method is used hyperbolic NMO formula to carry on velocity analysis,and manual pick-up velocity is needed to be used.So the density is restricted,the quality of velocity analysis is also influenced by human factors greatly.In addition,as a result of the anisotropic characteristics underground media,reflecting the travel time is no longer a hyperbola,the application of conventional hyperbolic NMO may lead to uneven correction in the far-offset.In is paper,the high-density anisotropic velocity analysis method is proposed to be used.High-density automatic velocity analysis may be conducted,so non-hyperbolic NMO problems caused by anisotropy could be solved.
To enhance the imaging precision of complex fault blocks and carry on fine description of small complex fault blocks,the key is to increase the density and precision of velocity analysis.Through actual data processing analysis,2% of the imgration velocity error will exert obvious effect on the intended interval migration imaging results during the application of prestack time migration to imaging of complex fault blocks.Therefore,improving the accuracy of velocity analysis is the key to high-precision seismic imaging.The conventional velocity analysis method is used hyperbolic NMO formula to carry on velocity analysis,and manual pick-up velocity is needed to be used.So the density is restricted,the quality of velocity analysis is also influenced by human factors greatly.In addition,as a result of the anisotropic characteristics underground media,reflecting the travel time is no longer a hyperbola,the application of conventional hyperbolic NMO may lead to uneven correction in the far-offset.In is paper,the high-density anisotropic velocity analysis method is proposed to be used.High-density automatic velocity analysis may be conducted,so non-hyperbolic NMO problems caused by anisotropy could be solved.
引文
[1]渥.伊尔马滋著.地震资料分析——地震资料处理、反演和解释[M].刘怀山,王克斌,童思友,等译.北京:石油工业出版社,2006.
[2]Emil Blias.Automatic high-density constrained velocity picking.FOCUS ARTICLE,2006.
[3]Siliqi R,Bousquie N.Anelliptic time processing based on a shifted hyperbola approach,70th Ann.Internat.Mtg:Soc.of Expl.Geophys.2000:2245～2248.
[2]Emil Blias.Automatic high-density constrained velocity picking.FOCUS ARTICLE,2006.
[3]Siliqi R,Bousquie N.Anelliptic time processing based on a shifted hyperbola approach,70th Ann.Internat.Mtg:Soc.of Expl.Geophys.2000:2245～2248.
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