保幅低频面波压制方法与应用

Amplitude preserved low frequency surface wave suppression and its application

面波是陆地地震勘探中的一种强能量规则干扰,面波的存在对地震数据成像有很大影响,因此需要对面波予以压制.常规面波压制方法只考虑面波的强能量特性,很容易损伤面波频带内的有效信号,难以满足地震资料保幅处理的要求.在传统方法的基础上,本文提出低频弱信号保护的面波压制方法,该方法在有效地消除面波干扰的同时,最大程度的减少了低频有效信息的损失,提高地震资料的信噪比和保幅性,松辽盆地北部西部斜坡地区实际地震资料的处理表明,该方法是一种有效的相对保幅的面波压制方法,可为岩性油气藏勘探提供重要的基础数据,具有很强的实用性.

Surface wave is a kind of strong energy regular interference in land seismic exploration, the presence of surface wave has a great influence on the seismic data imaging. Therefore surface wave should be suppressed. Conventional surface wave suppression methods only consider surface wave characteristics of strong energy, it is easy to damage the effective signal in surface wave frequency band by conventional method which is difficult to meet the requirements of the amplitude preservation. In this paper, we propose a surface wave suppression method which can protect the the low frequency weak primary signal. The method can suppress surface wave interference effectively, which can reduce low- frequency effective information loss in the greatest degree and improve seismic data signal-to-noise ratio and amplitude preservation processing. The field seismic data processing of west slope area in northern Songliao Basin show that the method is an effective relative amplitude preservation method for the surface wave suppression method, which can provide important basis data for lithologic reservoir exploration and is applicable for field seismic data.