在高分辨率地震勘探中仪器为什么要加低截滤波器

Why the instrument for hi-resolution seismic exploration should have low-cut filter

本文从高分辨率地震勘探的要求出发,阐述了在现有的地震仪器中为什么要加低截滤波器的原理和方法。针对我国较深的勘探目的层,用较高的低截滤波来补偿深层高频的弱信号,使之装入仪器的瞬时动态范围有独到的作用。文中还指出,勘探的要求与仪器的结构原理、技术性能的最佳结合,才是地震仪器发展的方向。

This paper is based on the requirement of hi-resolution seismic exploration and describes the principle and the method why the current seismic equipment should have low-cut filter. For the relative deep target lay-ers in China, the low-cut filter can be used for compensating the signal attenuation of high frequency and make it a proper instantaneous dynamic range of instrument. This paper also points out that the correct di-rection of development for seismic instrument needing the optimal combination with requirements of prospecting, the characteristic of instrument and technical parameters.