【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。更多还原

【Abstract】 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 de- tected 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 average- ly;and compared with 12-unit combination source,the SNR increases by 8.46dB averagely.Simulation re- sults prove the feasibility of using phased array source in detecting horizontal layer underground object with high SNR.更多还原