检波器尾锥结构对地震采集信号的影响

本文从降低地震勘探中表层低速度对高频信号的吸收衰减，增强检波器与地表的耦合入手，对检波器尾锥结构进行改进，即增加检波器尾锥长度，从而提高检波器接收有效信号的能力，有利于高频信号的采集和保真。

The influence of geophone tailcone structure upon acquired seismic signals

Seismic geophone tailcone is improved so as to enhance the coupling between geophone and ground and then to reduce the absorption attenuation of high frequency signal in surface low-velocity layer. To speak exactly, the geophone taiIcone is lengthened to ameliorate geophone's detection of effective waves and to favour acquisition and fidelity of high frequency signals.Detection mechanism of long tailcone geophone is analysed minutely in theory.This analysis says that tailcone lengthening results in stacking effect. The theoretical derivation of frequency curve of geophone tailcone came to the conclusions that suppression degree which stacking effect exerts on high frequency signals has something to do with tailcone length and velocities in surface layer and tailcone material,and that stacking effect is very unfavourable to both widening an useful receiving frequency band of geophone and protecting high frequency signals.It is shown experimentally that to collect the seismic signals of wide frequency band needs resonable tailcone length, which must be chosen according to surface layer condition.