各向异性处理技术探索与实践
摘要
叠前时间偏移技术在提高地震成像精度,为叠前反演的实现等方面发挥了重要作用。但随着各油田探区油气勘探程度的不断加深,对偏移成像精度的要求越来越高,各向同性处理技术已经难以满足勘探开发的要求。为了从根本上解决偏移成像与实际地质情况的误差问题,迫切需要对各向异性处理技术进行研究。应用Geocluster软件,在基于地层VTI介质的假设条件,通过HDPIC高密度自动双谱分析实现各向异性动校正。通过对各向异性叠前时间偏移处理方法、原理及实现过程的有益探索,在冀中探区陡倾角构造成像中见到了较好效果。
Pre-stack time migration played an important role in enhancing the precision of seismic imaging and implementing the pre-stack inversion.But with the deepening of oil exploration in the oilfields the requirement on the migration imaging technique was higher and higher,the isotropic technique could not meet the demands of oilfield exploration and development.In order to solve the problem of operation errors between the migration imaging and practical geological situation,it was badly needed to study the anisotropic treating techniques.Therefore Geocluster software was used to carry out a dynamic anisotropic calibration through HDPIC high density automatical bispectral analysis under the assumed condition of VTI medium.By studying the methods,principles and implementation of anisotropic pre-stack time migration treatment,a better result is obtained in high steep-dip structure imaging in Jidong Exploration Region.
Pre-stack time migration played an important role in enhancing the precision of seismic imaging and implementing the pre-stack inversion.But with the deepening of oil exploration in the oilfields the requirement on the migration imaging technique was higher and higher,the isotropic technique could not meet the demands of oilfield exploration and development.In order to solve the problem of operation errors between the migration imaging and practical geological situation,it was badly needed to study the anisotropic treating techniques.Therefore Geocluster software was used to carry out a dynamic anisotropic calibration through HDPIC high density automatical bispectral analysis under the assumed condition of VTI medium.By studying the methods,principles and implementation of anisotropic pre-stack time migration treatment,a better result is obtained in high steep-dip structure imaging in Jidong Exploration Region.
引文
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[8]Siliqi R,Le Meur D,Gamar F,et al.High-density moveout parameter fields Vandη,part one:simultaneous automatic picking[J].73th Ann.Internat.Mtg.,SEG Expanded Abstracts,2003.
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[2]渥.伊尔马滋.地震资料分析[M].刘怀山,王克斌译.北京:石油工业出版社,2006.
[3]Veritas C G G.Geocluster TMseismic processing software online documentation[Z].
[4]Anderson D L.Elastic wave propagationin layered anisotropic media[J].J.Geophys.Res.,1961,66:2953～2963.
[5]万志超,滕吉文,张秉明.各向异性介质中地震波速度分析的研究现状[J].地球物理学进展,1997,12(3):35～44.
[6]Thomsen L.Weak elastic anisotropy[J].Geophysics,1986,51(10):1954～1966.
[7]Nicolas Bousquié,Siliqi R.3D VTI eikonal solver for efficient acoustic travel time computation[J].SEG Annual Meeting,Expanded Abstract,2000.
[8]Siliqi R,Le Meur D,Gamar F,et al.High-density moveout parameter fields Vandη,part one:simultaneous automatic picking[J].73th Ann.Internat.Mtg.,SEG Expanded Abstracts,2003.
[9]Le Meur D,Siliqi R,Gamar F,et al.High-density moveout parameter fields Vandη,part two:simultaneous geostatistical filtering[J].73th Ann.Internat.Mtg.,SEG Expanded Abstracts,2003.
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