【摘要】 地震勘探震源激励的地震波具有初始频带特征,该信号经过地层介质扩散吸收、检波器接地耦合、敏感元件的转换、后置模拟信号调理以及模数转换等环节的再造,最后形成地震仪实际记录的数字信号,该记录信号能量主要集中在低主频频带上。双能量双通道采集技术基于一次震源激励,同时在一个坐标点获得高、低两个主频频带的地震记录,充分利用包括检波器的灵敏度、动态范围以及后续模拟电路和数字电路上元器件的动态范围。在低频通道采用适当的增益和信号调理电路获得低频宽频带记录,在高频通道通过高频检波器或高通滤波器以及高频补偿电路,获得以高频为主频的宽频带记录。通过该技术可以保证传统地震勘探中低主频信号的完整采集,地震装备的极限勘探深度也能得到最大限度的增大,两个不同频带能量信号可以相互对比和参考,有利于提高地震资料的处理、解释精度。更多还原

【Abstract】 The seismic wave excited by seismic exploration source has initial frequency bandwidth characteristic,before the signal of the seismic wave was finally received and recorded by seismic instrument,it dispersed and had been absorbed by subsurface media,then it was modified by geophone ground coupling and was transformed by sensitive elements,at last it was regulated by post-simulation signal and was rebuilt by A/D conversion and other processes,the energy distribution of the seismic signal is mainly in the low dominant frequency band,the dual-energy and dual-channel seismic acquisition technology which is based on one time source excitation,could simultaneously acquire seismic records in both low dominant frequency band and high dominant frequency band in a coordinate point,so that it could fully utilize both the sensitivity and dynamic range of the geophone,the dynamic range of the subsequently used analog circuits and elements of the digital circuits.Adequate gaining and signal regulation circuits were used for low frequency channel to acquire low frequency broadband data,while the high frequency geophone or high frequency filters and high frequency compensation circuits were used for high frequency channel to obtain the high frequency broadband data.By using the technology the low dominant frequency signal could be fully acquired in traditional seismic exploration,while the extreme limit exploration depth for the seismic instrument could be maximized,the energy signals from the two frequency bands could be correlated and referred with each other,so that the accuracy of the seismic interpretation and processing could be raised.更多还原