| 相控震源对水平层状地下介质的高信噪比检测 |
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| 引用本文： | 姜弢,林君,陈祖斌,张林行.相控震源对水平层状地下介质的高信噪比检测[J].仪器仪表学报,2006,27(11):1369-1372. |
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| 作者姓名： | 姜弢 林君 陈祖斌 张林行 |
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| 作者单位： | 吉林大学仪器科学与电气工程学院,长春,130061;教育部地球信息探测仪器重点实验室,长春,130061 |
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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： | 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19．25dB；与12单元的组合震源地震相比，反射波信噪比平均提高了8．46dB。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。
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| 关 键 词： | 相控 可控震源 层状介质 信噪比 地震 检测 |
| 修稿时间： | 2005年8月1日 |
High signal-to-noise ratio detection of horizontal layer underground medium with phased-array vibroseis |
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| Jiang Tao,Lin Jun,Chen Zubin,Zhang Linhang.High signal-to-noise ratio detection of horizontal layer underground medium with phased-array vibroseis[J].Chinese Journal of Scientific Instrument,2006,27(11):1369-1372. |
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| Authors: | Jiang Tao Lin Jun Chen Zubin Zhang Linhang |
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| 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. |
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| Keywords: | phased-array vibroseis horizontal layer medium SNR seismic detection |
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