可控震源的低频性能分析

Analysis of seismic vibrator's low-frequency performance

拓展可控震源的频带到低频(10Hz以下),对地球物理勘探来说有很多益处。由于可控震源机械和液压系统的结构限制,可控震源在低频的出力受到了严重限制。本文主要阐述制约可控震源低频出力的主要因素,目的是帮助地球物理学家了解可控震源的低频性能,以便设计合理的低频扫描信号。

Extending the bandwidth of seismic vibrators towards low frequency （less than 10 Hz） can bring many benefits for geophysical prospecting. Due to physical limitations from vibrator mechanical and hydraulic systems, the ability of seismic vibrators to produce ground force at low frequencies is significantly limited. This paper describes the key factors which limit vibrator performance at low frequencies. The main purpose is to help geophysicist better under- standing vibrator＇s performance at low frequencies so that to design an optimal low frequency sweep.