论文详情
提高可控震源生产效率面临着滑动扫描存在谐波干扰强、多震源同时激发会产生较强邻炮干扰、距离分离同时扫描需要大量设备等困难,此外地震数据质量的提高和采集成本的控制也受到这些因素的影响。引入分频同时扫描(Frequency Separated Simultaneous Sweep,FS3)技术,利用不同频率信号之间互不相干的特性,将一个目标扫描信号分离成若干个不同或相关性很小的频带的子信号,从而实现无邻炮干扰或其干扰最小的同时扫描。该方法激发时不受距离限制,提高了生产效率;为特定频带(特别是低频)增加激发能量创造了条件,减少了由非线性扫描带来的谐波干扰;可以使各频带能量输出均匀,从而实现合成记录的能量均衡,为后期取得优质的地震资料奠定了较好的基础。
It is challenging to improve the production efficiency of vibroseis in seismic exploration,for example,slip-sweep data is seriously affected by harmonics,multi-vibroseis simultaneous sweep data may be influenced by strong neighboring shots,and distance-separated simultaneous sweeps need large amounts of equipment.This paper applies frequency separated simultaneous sweep (FS3) technology,which divides a sweep signal into a few segments,with the sub-sweep signal consisting of part of the sweep frequency band.Thus,several vibrators can independently and simultaneously work with different sub-sweeps,and neighboring-shot interferences will be eliminated or kept at a minimum.This technology can increase production efficiency,enhance the energy of specific frequency bands such as low frequencies,and balance the energy for the seismic frequency band in records.Harmonics and crosstalk created by other high-efficiency vibroseis technologies such as nonlinear sweep can also be eliminated.The technology could help obtain high-quality vibroseis data.
国家科技重大专项深地资源勘查子课题“超深层重磁电震配套技术集成及技术经济适用性评价”(2016YFC0601107)资助。