共偏移距共反射面元叠加方法
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摘要
为了充分利用大炮检距信息对复杂地质条件下的地下构造进行叠加成像,基于传统的零偏移距共反射面元(ZO CRS)叠加提出共偏移距共反射面元(CO CRS)叠加方法。对叠加剖面的每个成像点确定叠加算子相应的5个参数是CO CRS叠加方法的关键,采用多参数分步搜索策略,在不同道集中分别搜索相关叠加参数,能够减少COCRS叠加方法的运行时间,有效解决实际生产中计算效率低的难题。模型试算结果证明基于CO CRS叠加得到的成像剖面与传统ZO CRS叠加剖面相比有着较高的信噪比和同相轴连续性,验证了搜索方法的有效性和实用性。
In order to fully utilize the far-offset information to obtain the stacked section of the subsurface in complicated geological conditions,the common-offset common-reflection-surface(CO CRS) stack was developed based on the conventional zero-offset common-reflection-surface(ZO CRS) stack.Determining the corresponding five parameters of stacking operator for every imaging point in the stack section is the key of CO CRS stacking method.By using split strategy for searching parameters,i.e separately searching the related stacking parameters in different gathers,the calculation time of CO CRS stack reduces and the difficulty of computational efficiency is effectively resolved in the actual application.The application results on model data show that compared with the image section by the conventional ZO CRS stack,the image section by CO CRS stack is relatively good in the aspect of signal-to-noise ratio and the continuity of reflection event,which proves the effectiveness and practicability of this searching algorithm.
In order to fully utilize the far-offset information to obtain the stacked section of the subsurface in complicated geological conditions,the common-offset common-reflection-surface(CO CRS) stack was developed based on the conventional zero-offset common-reflection-surface(ZO CRS) stack.Determining the corresponding five parameters of stacking operator for every imaging point in the stack section is the key of CO CRS stacking method.By using split strategy for searching parameters,i.e separately searching the related stacking parameters in different gathers,the calculation time of CO CRS stack reduces and the difficulty of computational efficiency is effectively resolved in the actual application.The application results on model data show that compared with the image section by the conventional ZO CRS stack,the image section by CO CRS stack is relatively good in the aspect of signal-to-noise ratio and the continuity of reflection event,which proves the effectiveness and practicability of this searching algorithm.
引文
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[12]ZHANG Y,BERGLER S,HUBRALP.Common-reflec-tion-surface(CRS)stack for common offset[J].Geo-physical Prospecting,2001,49(6):709-718.
[13]STEHT M.Imaging walkaway VSP data using the com-mon-reflection-surface stack[J].The Leading Edge,2007,26(6):764-768.
[2]王华忠,杨锴,马在田.共反射面元叠加的应用理论:从共反射点到共反射面元[J].地球物理学报,2004,47(1):137-142.WANG Hua-zhong,YANG Kai,MA Zai-tian.An ap-plied theory on common reflection surface stack-from com-mon reflection point to common reflection surface[J].Chinese Journal of Geophysics,2004,47(1):137-142.
[3]吴小羊,刘天佑,魏伟,等.二维菲涅耳带共反射面元叠加方法研究[J].地球物理学报,2008,51(6):1892-1898.WU Xiao-yang,LIU Tian-you,WEI Wei,et al.Two di-mensional common reflection surface stack based on theFresnel zone[J].Chinese Journal of Geophysics,2008,51(6):1892-1898.
[4]M LLER T,J GER R,H CHT G.Common reflectionsurface stacking method-imaging with an unknown velocitymodel[C/OL].SEG 68th Annual Meeting,New Orle-ans,Louisiana,September 13-18,1998:SEG ExpandedAbstracts 17,1764-1767[2008-05-07].http://dx.doi.org/10.1190/1.1820270.
[5]HUBRALP,H CHTG,J GER R.Seismic illumination[J].The Leading Edge,1999,18(11):1268-1271.
[6]GELCHINSKY B,BERKOVITCH A,KEYDAR S.Mul-tifocusing homeomorphic imaging,Part 1:basic conceptsand formulas[J].Journal of Applied Geophysics,1999,42(3/4):229-242.
[7]GELCHINSKY B,BERKOVITCH A,KEYDAR S.Mul-tifocusing homeomorphic imaging,Part 2:multifold dataset and multifocusing[J].Journal of Applied Geophys-ics,1999,42(3/4):243-260.
[8]J GER R,MANN J,H CHTG,et al.Common-reflec-tion-surface stack:imaging and attributes[J].Geophys-ics,2001,66(1):97-109.
[9]谭未一,杨长春,李瑞忠,等.共反射面元叠加的实现途径及流程[J].地球物理学进展,2004,19(2):325-330.TAN Wei-yi,YANG Chang-chun,LI Rui-zhong,et al.Common reflection surface stack algorithm and processingflow[J].Progress in Geophysics,2004,19(2):325-330.
[10]SUN X D,LI Z C,TENG HH.Common reflection sur-face stack using dip decomposition for rugged surface to-pography[J].Applied Geophysics,2007,4(1):45-50.
[11]BERGLER S.The common-reflection-surface stack forcommon offset theory and application[D].Germany:Geophysical Institute,University of Karlsruhe,2001.
[12]ZHANG Y,BERGLER S,HUBRALP.Common-reflec-tion-surface(CRS)stack for common offset[J].Geo-physical Prospecting,2001,49(6):709-718.
[13]STEHT M.Imaging walkaway VSP data using the com-mon-reflection-surface stack[J].The Leading Edge,2007,26(6):764-768.
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