共转换点道集的抽取与转换波时变静校正
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摘要
纵横波速度比固定时,同一地震道中各时间采样点对应不同的转换点位置,因此,常规的整体抽道方法只能抽取特定深度或特定层位条件下的共转换点道集,它不能保证所有P-SV转换波的反射点位置都在同一水平位置处。提出了一种精确抽取共转换点道集的新方法,运用这种方法抽取的共转换点道集中所有数据对应的转换点在地面的投影都对应于同一位置,因此,该道集是一种真正意义上的共转换点道集,在此基础上提出了一种解决短波长问题的转换波时变静校正方法,实际资料处理取得了好的效果。
When the velocity ratio between compressional wave and shear wave is fixed,the horizontal location of conversion point of each sample in a trace is different,so the traditional method of trace gathering can only gather the common conversion points(CCP) of a certain depth,which cannot guarantee that all the samples' conversion points are at the same location.In this paper,the authors present a new method for CCP binning,and the CCP gather obtained from this method is a really CCP gather in which the projection of all samples' conversion points are at the same location.Based on this method,a time-variant short-wavelength static correction method for converted waves is proposed and the real data processing results prove the method feasible and effective.
When the velocity ratio between compressional wave and shear wave is fixed,the horizontal location of conversion point of each sample in a trace is different,so the traditional method of trace gathering can only gather the common conversion points(CCP) of a certain depth,which cannot guarantee that all the samples' conversion points are at the same location.In this paper,the authors present a new method for CCP binning,and the CCP gather obtained from this method is a really CCP gather in which the projection of all samples' conversion points are at the same location.Based on this method,a time-variant short-wavelength static correction method for converted waves is proposed and the real data processing results prove the method feasible and effective.
引文
[1]孙显义,陈可为,许世勇.采用τ-p变换法进行纵、横波波场分离[J].大庆石油地质与开发,2002,21(4):76-77.[SUN Xian-yi,CHEN Ke-wei,XU Shi-yong.The separation of P-wave andSV-wave fields usingτ-ptransformation method[J].Petrole-um Geology&Oilfield Development in Daqing,2002,21(4):76-77.]
[2]周竹生,王卫华.一种快速、高精度的共转换点轨迹计算方法[J].石油地球物理勘探,1993,28(1):37-45.[ZHOU Zhu-sheng,WANG Wei-hua.A method for fast and accurately com-puting the common conversion point locus[J].Oil GeophysicalProspecting,1993,28(1):37-45.]
[3]崔秀,韩立国,葛勇.共转换点道集的迭代算法及应用[J].世界地质,1998,17(4):53-57.[CUI Xiu,HAN Li-guo,GEYong.The iterative algorithm and application of common con-verted point gathers[J].Global Geology,1998,17(4):53-57.]
[4]傅旦丹,朱宏彰,何汉漪.一种确定转换点的算法及其应用[J].石油物探,2002,41(1):26-30.[FU Dan-dan,ZHU Hong-zhang,HE Han-yi.A method for determination of conversionpoints and its application[J].Ceophysical Prospecting for Pe-troleun,2002,41(1):26-30.]
[5]何兵寿,张会星.共转换点速度分析[J].石油地球物理勘探,2005,40(5):510-514.[HE Bing-shou,ZHANG Hui-xing.A-nalysis of velocity at common-converted-point[J].Oil Geophys-ical Prospecting,2005,40(5):510-514.]
[6]魏修成,刘洋.高精度转换波速度分析[J],石油勘探与开发,2000,27(2):57-59.[WEI Xiu-cheng,LIU Yang.High preci-sion velocity analysis of converted wave[J].Petroleum Explo-ration and Development,2000,27(2):57-59.]
[7]朱衍镛.PS转换波的时差估计[J].石油地球物理勘探,1996,31(5):651-659.[ZHU Yan-yong.Moveout Estimation for P-Sconverted wave[J].Oil Geophysical Prospecting,1996,31(5):651-659.]
[8]唐建侯,张经山.消除P-SV波大静校正量的方法[J].石油地球物理勘探,1994,29(5):650-653.[TANG Jian-hou,ZHANGJing-shan.A method for removing high static moveouts of P-SV waves[J].Oil Geophysical Prospecting,1994,29(5):650-653.]
[9]郭桂红,王德利,何樵登,等.转换波的静校正[J].吉林大学学报地球科学版,2003,33(4):542-544,554.[GUO Gui-hong,WANG De-li,HE Qiao-deng,et al.Statics of converted wave[J].Journal of Jilin University(Earth Science Edition),2003,33(4):542-544,554.]
[10]赵秀莲,许士勇,马在田,等.转换波自动剩余静校正方法的实用研究[J].海洋石油,2003,23(增刊):59-65.[ZHAO Xiu-lian,XU Shi-yong,MA Zai-tian,et al.Application of automat-ic residual static correction for converted-wave(P-SV)seismicdata[J].Offshore Oil,2003,23(S1):59-65.]
[11]耿建华,马在田.在f-k域实现转换波(P-SV,SV-P)DMO[J].石油地球物理勘探,1995,30(1):62-65.[GENG Jian-hua,MA Zai-tian.DMO for P-SV and SV-P waves in f'-k domain[J].Oil Geophysical Prospecting,1995,30(1):62-65.]
[12]李录明,罗省贤.转换波叠前深度偏移[J].勘探地球物理进展,2005,28(3):183-186.[LI Lu-ming,LUO Xing-xian.Pres-tack depth migration for P-SV converted-wave[J].Progress inExploration Geophysics,2005,28(3):183-186.]
[13]黄中玉,朱海龙.转换波叠前偏移技术新进展[J].勘探地球物理进展,2003,26(3):167-171,185.[HUANG Zhong-yu,ZHU Hai-long.Advances in converted-wave prestack migra-tion[J].Progress in Exploration Geophysics,2003,26(3):167-171,185.]
[2]周竹生,王卫华.一种快速、高精度的共转换点轨迹计算方法[J].石油地球物理勘探,1993,28(1):37-45.[ZHOU Zhu-sheng,WANG Wei-hua.A method for fast and accurately com-puting the common conversion point locus[J].Oil GeophysicalProspecting,1993,28(1):37-45.]
[3]崔秀,韩立国,葛勇.共转换点道集的迭代算法及应用[J].世界地质,1998,17(4):53-57.[CUI Xiu,HAN Li-guo,GEYong.The iterative algorithm and application of common con-verted point gathers[J].Global Geology,1998,17(4):53-57.]
[4]傅旦丹,朱宏彰,何汉漪.一种确定转换点的算法及其应用[J].石油物探,2002,41(1):26-30.[FU Dan-dan,ZHU Hong-zhang,HE Han-yi.A method for determination of conversionpoints and its application[J].Ceophysical Prospecting for Pe-troleun,2002,41(1):26-30.]
[5]何兵寿,张会星.共转换点速度分析[J].石油地球物理勘探,2005,40(5):510-514.[HE Bing-shou,ZHANG Hui-xing.A-nalysis of velocity at common-converted-point[J].Oil Geophys-ical Prospecting,2005,40(5):510-514.]
[6]魏修成,刘洋.高精度转换波速度分析[J],石油勘探与开发,2000,27(2):57-59.[WEI Xiu-cheng,LIU Yang.High preci-sion velocity analysis of converted wave[J].Petroleum Explo-ration and Development,2000,27(2):57-59.]
[7]朱衍镛.PS转换波的时差估计[J].石油地球物理勘探,1996,31(5):651-659.[ZHU Yan-yong.Moveout Estimation for P-Sconverted wave[J].Oil Geophysical Prospecting,1996,31(5):651-659.]
[8]唐建侯,张经山.消除P-SV波大静校正量的方法[J].石油地球物理勘探,1994,29(5):650-653.[TANG Jian-hou,ZHANGJing-shan.A method for removing high static moveouts of P-SV waves[J].Oil Geophysical Prospecting,1994,29(5):650-653.]
[9]郭桂红,王德利,何樵登,等.转换波的静校正[J].吉林大学学报地球科学版,2003,33(4):542-544,554.[GUO Gui-hong,WANG De-li,HE Qiao-deng,et al.Statics of converted wave[J].Journal of Jilin University(Earth Science Edition),2003,33(4):542-544,554.]
[10]赵秀莲,许士勇,马在田,等.转换波自动剩余静校正方法的实用研究[J].海洋石油,2003,23(增刊):59-65.[ZHAO Xiu-lian,XU Shi-yong,MA Zai-tian,et al.Application of automat-ic residual static correction for converted-wave(P-SV)seismicdata[J].Offshore Oil,2003,23(S1):59-65.]
[11]耿建华,马在田.在f-k域实现转换波(P-SV,SV-P)DMO[J].石油地球物理勘探,1995,30(1):62-65.[GENG Jian-hua,MA Zai-tian.DMO for P-SV and SV-P waves in f'-k domain[J].Oil Geophysical Prospecting,1995,30(1):62-65.]
[12]李录明,罗省贤.转换波叠前深度偏移[J].勘探地球物理进展,2005,28(3):183-186.[LI Lu-ming,LUO Xing-xian.Pres-tack depth migration for P-SV converted-wave[J].Progress inExploration Geophysics,2005,28(3):183-186.]
[13]黄中玉,朱海龙.转换波叠前偏移技术新进展[J].勘探地球物理进展,2003,26(3):167-171,185.[HUANG Zhong-yu,ZHU Hai-long.Advances in converted-wave prestack migra-tion[J].Progress in Exploration Geophysics,2003,26(3):167-171,185.]
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