四参数速度分析法及其在垦71区三维转换波处理中的应用
摘要
胜利油田垦71地区多分量地震数据采用微型机电系统(MEMS)数字检波器采集,受转换波的非对称路径和各向异性的影响,剖面中非双曲同相轴广泛存在。传统的速度分析法基于各向同性理论,动校正时无法把同相轴拉平。为了实现同相轴的同相叠加,利用不同偏移距的动校正信息估算不同的参数,提出了一种新的四参数速度分析法。四参数指转换波叠加速度vC2、垂直速度比γ0、等效速度比γeff和转换波各向异性系数eχff。应用该方法对胜利油田垦71地区三维多波资料进行了处理。结果表明,该方法处理效果较好,且对该地区多分量资料的成像质量及PP波与PS波同相轴的相关性也有很大的改进。
The multi-component seismic data were acquired by digital micro-electro-mechanical system(MEMS) sensors of Ken-71 area in Shengli Oilfield.Both the asymmetry ray path and the anisotropic effects result in the serious non-hyperbolic move-out effects in the converted-wave data.Conventional velocity analysis based on isotropic theory can no longer flatten the moveout.Four-parameter theory was used to evaluate these effects and process the data.These four parameters include the PS converted wave stacking velocity(vC2),the vertical velocity ratio(γ0),the effective velocity ratio(γeff) and the anisotropy parameter(χeff).The method utilizes the move-out information at different offsets to estimate the different parameters,and ensures that the events are properly aligned for stacking.As a result,this four-parameter theory leads to an improvement in imaging quality and correlation between the P-waves and converted-waves.
The multi-component seismic data were acquired by digital micro-electro-mechanical system(MEMS) sensors of Ken-71 area in Shengli Oilfield.Both the asymmetry ray path and the anisotropic effects result in the serious non-hyperbolic move-out effects in the converted-wave data.Conventional velocity analysis based on isotropic theory can no longer flatten the moveout.Four-parameter theory was used to evaluate these effects and process the data.These four parameters include the PS converted wave stacking velocity(vC2),the vertical velocity ratio(γ0),the effective velocity ratio(γeff) and the anisotropy parameter(χeff).The method utilizes the move-out information at different offsets to estimate the different parameters,and ensures that the events are properly aligned for stacking.As a result,this four-parameter theory leads to an improvement in imaging quality and correlation between the P-waves and converted-waves.
引文
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[3]STEWARTR R,GAISER J E,BROWNR J,et al.Con-verted-wave seismic exploration:methods[J].Geophys-ics,2002,67:1345-1363.
[4]张永刚,王赞,王妙月.目前多分量地震勘探中的几个关键问题[J].地球物理学报,2004,47(1):151-155.ZHANG Yong-gang,WANG Zan,WANG Miao-yue.Some key problems in the multi-component seismic explo-ration[J].Chinese Journal of Geophysics,2004,47(1):151-155.
[5]石建新,王延光,毕丽飞,等.多分量地震资料处理解释技术研究[J].地球物理学进展,2006,21(2):505-511.SHI Jian-xin,WANG Yan-guang,BI Li-fei,et al.Theprocess-interpretation technique of multi-component seis-mic data[J].Progress in Geophysics,2006,21(2):505-511.
[6]裴正林.三维各向异性介质中弹性波方程交错网格高阶有限差分法数值模拟[J].石油大学学报:自然科学版,2004,28(5):23-29.PEI Zheng-lin.Three-dimensional numerical simulation ofelastic wave propagation in 3-D anisotropic media withstaggered-grid high-order difference method[J].Journalof the University of Petroleum,China(Edition of NaturalScience),2004,28(5):23-29.
[7]LI X Y,YUAN J.Converted-wave moveout and conver-sion-point equations in layered VTI media:theory and ap-plication[J].Journal of Applied Geophysics,2003,54:297-318.
[8]YUAN J.Analysis of four-component sea-floor seismic da-ta for seismic anisotropy[D].Edinburgh:University ofEdinburgh,2001.
[9]杜启振,董渊,杨慧珠.HTI介质横波正常时差速度反演[J].石油大学学报:自然科学版,2002,26(2):26-30.DU Qi-zhen,DONG Yuan,YANG Hui-zhu.Estimationof normal moveout velocity of S-wave in horizontal trans-verse isotropic(HTI)media[J].Journal of the Universi-ty of Petroleum,China(Edition of Natural Science),2002,26(2):26-30.
[10]毕丽飞,李振春,王延光,等.转换波处理中共转换点的定位[J].勘探地球物理进展,2005,28(5):353-356.BI Li-fei,LI Zhen-chun,WANG Yan-guang,et al.Po-sitioning of common converted point in the processing ofconverted-wave data[J].Progress in Exploration Geo-physics,2005,28(5):353-356.
[11]DAI H,LI X.Anisotropic migration and model buildingfor 4-C seismic data:a case study from Alba[C]//SocExpl Geophys 71stAnn Int Mtg,c2001:795-798.
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