地震数据采集井中接收的“伪陷波”效应

On the research of pseudo-notch in seismic data acquisition

1. 西安交通大学建力学院,西安710049;2. 胜利石油管理局物探公司工艺研究所,东营257100

Xi’an Transportation University, Xi’an 710049

在地震勘探中,有时将检波器埋在井中接收。本文通过对实际资料分析,提出了检波器井中接收所引起的“伪陷波”问题,并从理论上分析了伪陷波产生的机制,并采用不同的激发方式和接收深度进行了野外试验,进一步证实“伪陷波”对地震信号的影响。通过对这一现象的科学研究,可以有助于在高分辨地震勘探中减少一些不必要的幅频损失,从而获得较高品质的地震资料。

In the practice of seismic survey geophones sometimes are buried in boreholes. The problem of pseudo notch arised from downhole receiving and its mechanism of generation are discussed theoretically with real seismic data. It further illustrates the influence of pseudo notch to seismic signals for a field experiment with different exciting mode and receiving depth. The research of pseudo notch is helpful to reduce spectrum loss in high resolution seismic survey. Thus seismic data of high quality is acquired.