可控震源三元伪随机扫描信号的仿真与研究
|
摘要
可控震源技术是一种重要的地震勘探技术,扫描技术是可控震源技术的重要组成部分。扫描信号自相关函数的形状是影响可控震源分辨率和信噪比的主要因素,因此,改善扫描信号自相关函数的性能是提高地震勘探效果的最佳途径。针对可控震源的特点和扫描信号对地震勘探的影响,研究了三元伪随机编码的生成方法,利用三元伪随机序列构造了三元伪随机扫描信号,并对三元伪随机扫描信号进行仿真分析,通过仿真结果得出了三元伪随机扫描信号本原多项式的阶次以及载波频率和自相关函数3者之间的关系,以及这两个参数对自相关函数的影响,为提高可控震源地震勘探效果提供了相应的理论依据,得到了适用于地震勘探的扫描信号,具有良好的应用前景和研究价值。
Vibroseis technology was one of the important seismic exploration techniques,and scanning technique was a composite part of vibroseis.The main factors affecting the resolution and signal to noise ratio of vibroseis was the shape of scanning signal autocorrelation function.Therefore the best way to enhance the effect of seismic exploration was to improve the performance of the autocorrelation function.According to the characteristics of vibroseis and the effect of scanning signal on seismic exploration,the generation of ternary pseudo-random code was researched,based on the obtained pseudo-random code,ternary pseudo-random scanning signals were obtained.The results reveal that the relationships between the ternary pseudo-random scanning signals of primitive polynomial and carrier frequency and autocorrelation function,and the effect of the two parameters on autocorrelation are obtained.Furthermore,it provides corresponding theoretical basis for vibroseis,which is suitable for scanning signals for seismic exploration are obtained and it has good application prospects and researching value.
Vibroseis technology was one of the important seismic exploration techniques,and scanning technique was a composite part of vibroseis.The main factors affecting the resolution and signal to noise ratio of vibroseis was the shape of scanning signal autocorrelation function.Therefore the best way to enhance the effect of seismic exploration was to improve the performance of the autocorrelation function.According to the characteristics of vibroseis and the effect of scanning signal on seismic exploration,the generation of ternary pseudo-random code was researched,based on the obtained pseudo-random code,ternary pseudo-random scanning signals were obtained.The results reveal that the relationships between the ternary pseudo-random scanning signals of primitive polynomial and carrier frequency and autocorrelation function,and the effect of the two parameters on autocorrelation are obtained.Furthermore,it provides corresponding theoretical basis for vibroseis,which is suitable for scanning signals for seismic exploration are obtained and it has good application prospects and researching value.
引文
[1]王忠仁,樊丹丹,高健,等.基于三元伪随机编码的可控震源信号设计方法[J].石油地球物理勘探,2009,44(5):534～536.
[2]孙峰,王忠仁,陈祖斌,等.可控震源的伪随机扫描与系统测试[J].光学精密工程,2009,17(10):2569～2575.
[3]樊丹丹.可控震源三元伪随机编码扫描技术研究及信号发生器研制[D].长春:吉林大学,2008.
[4]Ipatov V P.Ternary sequences with ideal periodic autocorrelation properties[J].Radio Eng Electron Phys,1979,24:75～79.
[5]沈媛媛,郑恭明,刘益成,等.可控震源伪随机扫描信号的仿真研究[J].物探与化探,2010,34(3):344～347.
[6]薛海飞,董守华,陶文朋.可控震源地震勘探中的参数选择[J].物探与化探,2010,34(2):185～190.
[2]孙峰,王忠仁,陈祖斌,等.可控震源的伪随机扫描与系统测试[J].光学精密工程,2009,17(10):2569～2575.
[3]樊丹丹.可控震源三元伪随机编码扫描技术研究及信号发生器研制[D].长春:吉林大学,2008.
[4]Ipatov V P.Ternary sequences with ideal periodic autocorrelation properties[J].Radio Eng Electron Phys,1979,24:75～79.
[5]沈媛媛,郑恭明,刘益成,等.可控震源伪随机扫描信号的仿真研究[J].物探与化探,2010,34(3):344～347.
[6]薛海飞,董守华,陶文朋.可控震源地震勘探中的参数选择[J].物探与化探,2010,34(2):185～190.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心