可控震源分频同时扫描技术
发布时间：2018-11-24 12:43
【摘要】：可控震源作为地震勘探的信号源已得到广泛应用。数据处理技术的进步催生了许多提高可控震源施工效率的方法,但这些方法或多或少存在一些缺点,如滑动扫描方法的谐波干扰强,多震源同时激发方法因同时扫描信号之间的相关性导致邻炮干扰强,距离分离的同时扫描方法需投入众多装备。本文引入分频同时扫描(FS3)方法,通过信号切分、重组实现多震源同时扫描,利用不同频率之间的互不相干特性,将一个目标扫描信号分离成若干不同或相关性很小频带的子信号,实现无邻炮干扰或干扰最小的同时扫描,然后把所有同点包含一个目标扫描信号的子信号(扫描数据)重组为该点的观测数据输出形成单炮记录。因该方法可增强特定频带(尤其是低频)的能量,故既能减少由非线性扫描带来的谐波干扰,还可使记录中各频带输出能量均衡。
[Abstract]:Vibroseis have been widely used as signal sources for seismic exploration. The advancement of data processing technology has given birth to many methods to improve the construction efficiency of vibroseis, but these methods have some disadvantages more or less, such as the strong harmonic interference of sliding scanning method. The simultaneous excitation method of multiple seismic sources results in strong interference from adjacent guns due to the correlation between simultaneously scanned signals, and the simultaneous scanning method of distance separation needs a lot of equipment. In this paper, the frequency division simultaneous scanning (FS3) method is introduced. By signal segmentation and recombination, multi-source simultaneous scanning is realized, and the incoherence between different frequencies is utilized. The scanning signal of a target is separated into several sub-signals with different or very small correlated frequency bands to realize simultaneous scanning without or with minimal interference from adjacent guns. Then, all the sub-signals (scanning data) containing a target scan signal at the same point are recombined to output the observation data at that point to form a single shot record. Because this method can enhance the energy of special frequency band (especially low frequency), it can not only reduce the harmonic interference caused by nonlinear scanning, but also equalize the output energy of each frequency band in the recording.
【作者单位】： 中国石油东方地球物理公司国际勘探事业部;
【基金】：国家重点研发计划深地专项项目(2016YFC0601100)资助
【分类号】：P631.4
，
本文编号：2353761
[Abstract]:Vibroseis have been widely used as signal sources for seismic exploration. The advancement of data processing technology has given birth to many methods to improve the construction efficiency of vibroseis, but these methods have some disadvantages more or less, such as the strong harmonic interference of sliding scanning method. The simultaneous excitation method of multiple seismic sources results in strong interference from adjacent guns due to the correlation between simultaneously scanned signals, and the simultaneous scanning method of distance separation needs a lot of equipment. In this paper, the frequency division simultaneous scanning (FS3) method is introduced. By signal segmentation and recombination, multi-source simultaneous scanning is realized, and the incoherence between different frequencies is utilized. The scanning signal of a target is separated into several sub-signals with different or very small correlated frequency bands to realize simultaneous scanning without or with minimal interference from adjacent guns. Then, all the sub-signals (scanning data) containing a target scan signal at the same point are recombined to output the observation data at that point to form a single shot record. Because this method can enhance the energy of special frequency band (especially low frequency), it can not only reduce the harmonic interference caused by nonlinear scanning, but also equalize the output energy of each frequency band in the recording.
【作者单位】： 中国石油东方地球物理公司国际勘探事业部;
【基金】：国家重点研发计划深地专项项目(2016YFC0601100)资助
【分类号】：P631.4
，
本文编号：2353761
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2353761.html
