相控震源对水平层状地下介质的高信噪比检测  

High signal-to-noise ratio detection of horizontal layer underground medium with phased-array vibroseis

作　　者：姜弢[1] 林君[1] 陈祖斌[1] 张林行[1] 

机构地区：[1]吉林大学仪器科学与电气工程学院

出　　处：《仪器仪表学报》2006年第11期1369-1372,共4页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(40674096);国家863项目(2002AA135240)资助项目。

摘　　要：为提高可控震源地震勘探数据的信噪比,采用能够产生定向地震波的相控震源,针对水平层状地下介质模型,给出了不同信噪比条件下的单震源、相控震源信号检测结果。使用单震源时不能分辨的目标层反射波信号,在相控震源地震记录中清晰可见；通过定量计算,用12单元的相控震源地震与单震源情况相比,反射波信噪比平均提高了19．25 dB；与12单元的组合震源地震相比,反射波信噪比平均提高了8．46 dB。可见,相控震源应用于水平层状地下目标体的高信噪比探测是可行的。In order to improve signal-to-noise ratio （SNR） in electric-magnetic vibroseis seismic prospecting, a phased-array vibroseis system that can generate a directional wave was developed. Applying this new source and cross-correlation detection technique, the seismic signals from horizontal layer medium were detected in different noise conditions. Comparing the seismic signal detected from single source with that from phased array source, it is obvious that some reflected waves that can not be perceived in single source case are clear when phased-array source is used. Furthermore, quantitative calculation shows that compared with single source case, the SNR of reflected wave for 12-unit phased-array source increases by 19.25dB averagely; and compared with 12-unit combination source, the SNR increases by 8. 46dB averagely. Simulation resuits prove the feasibility of using phased array source in detecting horizontal layer underground object with high SNR.

关 键 词：相控 可控震源 层状介质 信噪比 地震 检测 

分 类 号：TH763[机械工程—仪器科学与技术]