相控震源地震波定向技术
|
摘要
针对采用多个震源同时工作的组合地震勘探,仍有所使用的震源数目受限,不适于大倾角地层勘探的问题,提出了一种产生定向地震波的方法。该方法将相控阵技术应用于可控震源阵列,通过控制相邻震源的相位差恒定,使各震源产生的地震波在某个方向上同相叠加,震动加强,形成定向的地震波束,且地震波方向、宽度可控。并从理论上分析了可控震源阵列的震源数目,空间排列方式,相差与定向地震波的关系;仿真形式给出定向地震波方向图。结果表明,采用该方法可使检波器接收信号的信噪比从组合地震的17.34dB提高到27.7dB,地震剖面图的分辨力提高17%。
Multi-vibroseis assembled seism method is limited with amount and not be able to explore steep stratum. Instead, a phased array of vibroseis is able to produce a kind of seismic beam-forming by a method of maintaining constant difference of phases between close vibroseis. With this method, different seismic waves from different vibroseis can enhance in certain direction because they are in phase. Moreover, the direction and extent of the seismic wave could be adjusted. It stated the relation between the seismic beam-forming and the number of units, the arrangement, the difference of phases for vibroseis system. Finally, it gaves out seismic beam-forming based simulation by a graph. The results show that signal-to-noise of received data can be increased from 17\^34 dB to 27\^7 dB and the ability of division for seismic section plane can be increased 17%.
Multi-vibroseis assembled seism method is limited with amount and not be able to explore steep stratum. Instead, a phased array of vibroseis is able to produce a kind of seismic beam-forming by a method of maintaining constant difference of phases between close vibroseis. With this method, different seismic waves from different vibroseis can enhance in certain direction because they are in phase. Moreover, the direction and extent of the seismic wave could be adjusted. It stated the relation between the seismic beam-forming and the number of units, the arrangement, the difference of phases for vibroseis system. Finally, it gaves out seismic beam-forming based simulation by a graph. The results show that signal-to-noise of received data can be increased from 17\^34 dB to 27\^7 dB and the ability of division for seismic section plane can be increased 17%.
引文
[1]ADRIANGARROD.Digitalmodulesforphasearrayradar[C]∥IEEEInternationalRadarConference.[s.l.]:[s.n.].1995:726—731.
[2]DENNOS,OHIRAT.Modifiedconstantmodulusalgorithmfordigitalsignalprocessingadaptiveantennaswithmicrowaveanalogbeamforming,antennasandpropagation[J].IEEETransactionson,2002,50(6):850—857.
[3]ARNOLDME.Beamformingwithvibratorarrays[J].Geophisics,42(7):1321—1337.
[4]AGRAWALM,PRASADS.Robustadaptivebeamformingforwide-band,moving,andcoherentjammersviauniformlineararrays,antennasandpropagation[J].IEEETransactionson,1999,47(8):1267—1275.
[5]林君,陈祖斌(LINJun,CHENZu-bin).可控震源-大地耦合模型研究(Studyonmodaloncouplingforvibroseiswithground)[J].中国学术期刊文摘(AcademicPeriodicalAbstractsofChina),1999,5(6):811—812.
[6]张子山,林君,陈祖斌,于生宝(ZHANGZi-shan,LINJun,CHENZu-bin,YUSheng-bao).轻便高频可控震源的计算机测控系统(IndustrialPCbasedmeasurement&controlsysteminportablehigh-frequencyvibrator)[J].计算机自动测量与控制(ComputerAuto-MeasureandControl),2000,8(4):10—12.
[7]CHENZu-bin,LINJun.Designforvibratorfieldexperimentbasedonvibrator-Earthsystem[J].JournalofGeoscientificResearchinNortheastAsia,2000,3(1):107—113.
[8]蒋忠进,林君(JIANGZhong-jin,LINJun).三阶累计量在可控震源地震勘探信号处理中的应用(Theapplicationofthree-ordercumulantonsignalprocessforvibroseisexploration)[J].系统工程与电子技术(SystemEngineeringandElectronicTechnique),2003,10(1):1431—1434.
[9]蒋忠进,林君(JIANGZhong-jin,LINJun).小波包在可控震源地震勘探信号处理中对时延估计的应用(Applicationofwaveletpacketintime-delayestimationofsignalofvibroseisexploration)[J].吉林大学学报:信息科学版(JournalofJilinUniversity:InformationScienceEdition),2003,21(2):105—108.
[2]DENNOS,OHIRAT.Modifiedconstantmodulusalgorithmfordigitalsignalprocessingadaptiveantennaswithmicrowaveanalogbeamforming,antennasandpropagation[J].IEEETransactionson,2002,50(6):850—857.
[3]ARNOLDME.Beamformingwithvibratorarrays[J].Geophisics,42(7):1321—1337.
[4]AGRAWALM,PRASADS.Robustadaptivebeamformingforwide-band,moving,andcoherentjammersviauniformlineararrays,antennasandpropagation[J].IEEETransactionson,1999,47(8):1267—1275.
[5]林君,陈祖斌(LINJun,CHENZu-bin).可控震源-大地耦合模型研究(Studyonmodaloncouplingforvibroseiswithground)[J].中国学术期刊文摘(AcademicPeriodicalAbstractsofChina),1999,5(6):811—812.
[6]张子山,林君,陈祖斌,于生宝(ZHANGZi-shan,LINJun,CHENZu-bin,YUSheng-bao).轻便高频可控震源的计算机测控系统(IndustrialPCbasedmeasurement&controlsysteminportablehigh-frequencyvibrator)[J].计算机自动测量与控制(ComputerAuto-MeasureandControl),2000,8(4):10—12.
[7]CHENZu-bin,LINJun.Designforvibratorfieldexperimentbasedonvibrator-Earthsystem[J].JournalofGeoscientificResearchinNortheastAsia,2000,3(1):107—113.
[8]蒋忠进,林君(JIANGZhong-jin,LINJun).三阶累计量在可控震源地震勘探信号处理中的应用(Theapplicationofthree-ordercumulantonsignalprocessforvibroseisexploration)[J].系统工程与电子技术(SystemEngineeringandElectronicTechnique),2003,10(1):1431—1434.
[9]蒋忠进,林君(JIANGZhong-jin,LINJun).小波包在可控震源地震勘探信号处理中对时延估计的应用(Applicationofwaveletpacketintime-delayestimationofsignalofvibroseisexploration)[J].吉林大学学报:信息科学版(JournalofJilinUniversity:InformationScienceEdition),2003,21(2):105—108.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心