| 相控震源对地震信号信噪比的改善研究 |
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| 引用本文： | 姜弢,林君,李桐林,陈祖斌,张林行.相控震源对地震信号信噪比的改善研究[J].地球物理学报,2006,49(6):1819-1825. |
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| 作者姓名： | 姜弢 林君 李桐林 陈祖斌 张林行 |
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| 作者单位： | 1.吉林大学仪器科学与电气工程学院，长春 130026 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，长春 130026 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 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154～990 dB.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.
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| 关 键 词： | 可控震源 组合 相控 信噪比 数值模拟 |
| 文章编号： | 0001-5733（2006）06-1819-07 |
| 收稿时间： | 2005-09-26 |
| 修稿时间： | 2005-09-262006-07-31 |
Boosting signal to noise ratio of seismic signals using the phased_array vibrator system |
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| JIANG Tao,LIN Jun,LI Tong-Lin,CHEN Zu-Bin,ZHANG Lin-Hang.Boosting signal to noise ratio of seismic signals using the phased_array vibrator system[J].Chinese Journal of Geophysics,2006,49(6):1819-1825. |
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| Authors: | JIANG Tao LIN Jun LI Tong-Lin CHEN Zu-Bin ZHANG Lin-Hang |
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| Institution: | 1.College of Instrument Science and Electrical Engineering, Jilin University, Changchun 130026, China 2 Key Laboratory of Geo exploration Instrumentation of Ministry of Education, Jilin University, Changchun 130026, China 3 College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | 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 154～990 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 improve seismic signal SNR. Moreover, the phased array source can boost SNR obviously when more vibrators are applied but there is no similar result for the combination source. |
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| Keywords: | Vibroseis Combination Phased-array Signal to noise ratio(SNR) Numerical simulation |
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