摘要
常规可控震源扫描信号的低频极限频率普遍在6Hz左右,低频可控震源是指能够用于激发信号的最低频率低于5Hz的可控震源。低频信号由于其所具有的波长属性,具备了对一些高速地质体良好的穿透性、其频带宽度对地质目标分辨率与信噪比的改善具有重要的意义,目前只有可控震源可以很好地满足未来地震勘探的激发需要,因此,低频可控震源成为制约低频地震勘探的重要因素。目前研究人员初步解决了制约低频信号激发的一系列问题,使KZ-28LF成功地实现了井下3Hz信号的激发。
The limitation of low frequency for Conventional vibrator is around 6Hz, the low frequency vibrator can sweep from 5Hz or lower. With longer wavelength its can penetrate high velocity layers, the bandwidth of the signal is key factor to improve resolution and S/N ratio of geological target. The vibrator is the unique source that can meet the requirement in future land seismic, and the low frequency vibrator became restrict factor for low frequency seismic currently. The research people solved serious knots for low frequency initiation, and realized 3Hz signal received in downhole sensors with KZ-28LF vibrator.
出处
《物探装备》
2010年第1期1-5,共5页
Equipment for Geophysical Prospecting
基金
国家重大科技专项2008ZX05019子课题
关键词
低频信号
可控震源
激发技术
low frequency sweep
vibrator
source technique
