工程反射地震非常规方法野外施工的探讨
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摘要
工程反射地震常规的多次覆盖系统、排列和炮点的同时滚动,导致了施工效率的低下。为解决这个问题,从共反射点原理出发,详细探讨了非常规的移动炮点的多次覆盖观测方法,并与常规的多次覆盖观测方法进行了对比。认为这种方法在提高野外施工效率的同时,也可以提高数据的信噪比和速度分析的精度,并且可兼顾折射法和多道面波的应用。
The conventional layout for CDP reflection survey in engineering geophysics,in which the receiving arrays and the shooting points are moving simultaneously,often causes lower efficiency.Based on the principle of common depth point,the authors present an unconventional geometry system in which only shooting points are moved.The geometry system is discussed in detail,and is also compared with the conventional layout.It is believed that not only increases the new geometry field work efficiency,but also could improve the data S/N ratio and the accuracy of velocity analysis.It can be applied in refraction seismology and multichannel analysis of surface waves(MASW)survey as well.
The conventional layout for CDP reflection survey in engineering geophysics,in which the receiving arrays and the shooting points are moving simultaneously,often causes lower efficiency.Based on the principle of common depth point,the authors present an unconventional geometry system in which only shooting points are moved.The geometry system is discussed in detail,and is also compared with the conventional layout.It is believed that not only increases the new geometry field work efficiency,but also could improve the data S/N ratio and the accuracy of velocity analysis.It can be applied in refraction seismology and multichannel analysis of surface waves(MASW)survey as well.
引文
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[3]Xia Jianghai,Richard D Miller,Choon B Park,et al.Utilization of high-frequency Rayleigh waves in near-surface geophysics[J].The Leading Edge,2004,23(8):753 759.
[4]Choon B Park,Richard D Miller,Xia Jianghai.Multi-channel analysis of surface waves[J].Geophysics,1999,64(3):800 808.
[5]Tian Gang,Don W Steeples,Xia Jianghai,et al.Use-ful resorting in surface-wave method with the autojug-gie[J].Geophysics,2003,68(6):1 906 1 908.
[6]Spikes K T,Ralston M D,Steeples D W.ObtainingCMP data with automatically planted geophones[R].SEG Annual Meeting Expanded Abstracts,San An-tonio,U.S.A.,2001:1 369 1 372.
[7]侯卫生,刘江平.工程地震勘探新进展[J].勘探地球物理进展,2002,25(6):59 64HOU Wei-sheng,LIU Jiang-ping.The development ofengineering seismic exploration[J].Progress in Explo-ration Geophysics,2002,25(6):59 64.
[8]何樵登.地震勘探原理和方法[M].北京:地质出版社,1986:170.HE Qiao-deng.The principle and method of seismicexploration[M].Beijing:Geological PublishingHouse,1986:170.
[9]王振东.浅层地震勘探应用技术[M].北京:地质出版社,1988:135.WANG Zhen-dong.The application technology ofshallow seismic exploration[M].Beijing:GeologicalPublishing House,1988:135.
[10]潘纪顺,张先康,刘保金,等.城市活断层的抗干扰高分辨率浅层地震勘探研究[J].中国地震,2003,19(2):148 157.PAN Ji-shun,ZHANG Xian-kang,LIU Bao-jin,etal.Research on detecting urban active faults by shal-low seismic exploration method with anti-disturbancehigh resolution[J].Earthquake Research in China,2003,19(2):148 157.
[11]刘保金,张先康,方盛明,等.城市活断层探测的高分辨率浅层地震数据采集技术[J].地震地质,2002,24(4):524 532.LIU Bao-jin,ZHANG Xian-kang,FANG Sheng-ming,et al.Acquisition technology of high resolution shal-low seismic data for surveying of urban active faults[J].Seismology and Geology,2002,24(4):524 532.
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