首页 | 官方网站   微博 | 高级检索  
     

延时参数对地震信号信噪比的改善
引用本文:姜弢,林君,陈祖斌.延时参数对地震信号信噪比的改善[J].地球物理学报,2009,52(6):1651-1656.
作者姓名:姜弢  林君  陈祖斌
作者单位:1.吉林大学仪器科学与电气工程学院,长春 130061;2.教育部地球信息探测仪器重点实验室,长春 130061
摘    要:当测区噪声很强,采用组合震源工作仍然不能得到高质量地震数据,为进一步提高地震信号的信噪比,引入能形成定向地震波的相控震源.相控震源产生的地震波方向可由延时参数控制,因此延时参数是影响相控地震效果的重要参数.理论分析表明,定向地震波技术可提高反射波信号信噪比,以含3个激震器的相控震源为例,信噪比可提高6.53~9.54 dB.针对延时参数分别为0,0.802,0.384,0.241,0.174,0.123 ms的情况,完成了野外地震实验.根据原始地震记录,得到了反射波信号功率谱,在此基础上定量地计算了不同延时参数下目标层反射信号的信噪比.结果表明,与单震源情况相比,在6种延时参数下,反射波信噪比分别提高了3.3150,8.0150,6.0547,5.0278,4.5383,4.0364 dB;与组合震源情况相比,信噪比分别提高了0,4.7000,2.7397,1.7128,1.2233,0.7214 dB.综合理论分析及野外实验结果,我们可以得到这样的结论:定向地震波技术能够提高反射波信号信噪比,延时参数变化对信噪比有很大影响,采用合理的延时参数能得到更高的信噪比.

关 键 词:信噪比  震源  相控  延时  地震信号  
收稿时间:2008-4-29
修稿时间:2008-6-24

SNR improvement of seismic signals with different time delays
JIANG Tao,LIN Jun,CHEN Zu-Bin.SNR improvement of seismic signals with different time delays[J].Chinese Journal of Geophysics,2009,52(6):1651-1656.
Authors:JIANG Tao  LIN Jun  CHEN Zu-Bin
Affiliation:1.College of Instrument Science and Electrical Engineering, Jilin University, Changchun 130061, China;2.Key Laboratory of Geo-exploration Instrumentation of Ministry of Education, Jilin University, Changchun 130061, China
Abstract:When noise in the field is strong, it′s difficult to obtain high SNR seismic data with single or combination vibrator. So phased-array vibrator system (PAVS), which can form directional seismic beam, was developed. Because the orientation of the directional seismic wave is dependent on the time delay, the time delay is a dominant factor for PAVS to boost SNR of reflected signals. 3-unit PAVS is able to improve SNR by 6.53~9.54 dB based on theoretical analysis. Field seismic data were obtained for time delays 0, 0.802, 0.384, 0.241, 0.174, and 0.123 ms respectively. Using the raw data with different time delays, the power spectrums of reflected seismic signals were calculated, and then quantitative SNR improvement is obtained. Compared to the case of single source, SNR increased by 3.3150,8.0150,6.0547,5.0278,4.5383,and 4.0364 dB, respectively. Compared to the case of combination source, SNR increased by 0, 4.7000,2.7397,1.7128,1.2233,and 0.7214 dB, respectively. On the basis of theoretical analysis and the results of field experiment, it concludes that directional seismic beam technique is useful to SNR improvement, SNR varies with time delay, proper time delay can raise SNR of reflected signals significantly.
Keywords:SNR  Vibrator  Phased-array  Time delay  Seismic signals
本文献已被 万方数据 等数据库收录!
点击此处可从《地球物理学报》浏览原始摘要信息
点击此处可从《地球物理学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号