相控震源对地震信号信噪比的改善研究  

Boosting signal to noise ratio of seismic signals using the phased-array vibrator system

作　　者：姜弢[1,2] 林君[1,2] 李桐林[3] 陈祖斌[1,2] 张林行[1,2] 

机构地区：[1]吉林大学仪器科学与电气工程学院 [2]教育部地球信息探测仪器重点实验室,长春130026 [3]吉林大学地球探测科学与技术学院

出　　处：《地球物理学报》2006年第6期1819-1825,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40674096);国家863项目(2002AA135240)联合资助

摘　　要：当测区噪声很强，采用组合震源工作仍然不能满足信噪比要求时，为进一步提高地震勘探信噪比，引入能形成定向地震波的相控震源．针对水平层状介质模型，对组合震源、相控震源地震进行了数值模拟，并定量计算了采用4，8，15，20单元的组合与相控震源地震数据的信噪比，同组合地震相比，相控地震使来自不同反射层的反射波信号的信噪比平均提高了1．54-9．90dB．结果表明，相控震源地震得到的反射波信号信噪比高于组合地震，并且随着激震器数目增加，相控震源合成地震记录中的反射波地震数据信噪比明显提高．When noise in the field is very strong, we can not get data with proper signal to noise ratio （SNR） even if combination vibroseis is used. To solve this problem we propose to apply a phased-array vibrator, which can form a directional seismic wave. We have made numerical simulation of multi-track seismograms and computed reflected waves＇ SNR for combination and phased-array sources in a given horizontal stratified model. The result shows that the average SNR of reflected waves increases 1.54 - 9.90 dB respectively than the combination source when the 4, 8, 15 and 20-unit phased-array vibrators are used. We conclude that the phased-array source is competent to SNR obviously when more vibrators improve seismic signal SNR. Moreover, the phased-array source can boost are applied but there is no similar result for the combination source.

关 键 词：可控震源 组合 相控 信噪比 数值模拟 

分 类 号：P631[天文地球—地质矿产勘探]