Method Of Harmonic Noise Elimination By Vibroseis Based On Adaptive Matched Filitering

Currently,vibroseis seismic exploration has become the world's indispensable seismic source of seismic exploration,which is safe,more environmentally friendly and higher economic value,and it will become the next major seismic source in the field of domestic seismic exploration.But because of nonlinearity of vibroseis vibration device inside,vibration plate and ground coupling,so vibrator inevitably produce harmonic interference.Harmonic interference will directly affect the accuracy of seismic data.Especially the slip-sweep acquisition,which is an efficient vibroseis acquisition mode in order to improve production efficiency and reduce costs,will produce produce harmonic interference much.Therefore we need to study efficient method for removing harmonic interference generated by the vibrator.This paper introduced from the mechanism of harmonic generation,including describes two main reasons for vibroseis harmonic generation,analysis of harmonic interference mechanism,consisting of harmonic components,harmonic interference characteristic analysis.After that,I discuss two basic harmonic suppression method,method of harmonic noise elimination based on its estimation and the pure phase shift method.Wherein the pure phase shift method is very suitable for VSP data,and can effectively separate the harmonic distortion signal fundamental signal and the harmonic signal,but the pure phase shift method is not conducive to signal fidelity method of harmonic noise elimination based on its estimation is suitable for slip-sweep acquisition mode,and the method is very simple and flexible.Finally,this paper proposes a new method of harmonic noise elimination by vibroseis based on adaptive matched filitering,which is to design an appropriate matched filter operator to estimate the harmonic component and remove it.In theory,this method does not cause damage to the valid signal,maximize the elimination of harmonic components.