System Four前放增益选择方法探讨

Discussion on selection of System Four pre-amp gain

System Four是第五代数字地震仪,其先进的功能和庞大的带道能力预示着地震勘探技术的又一次飞跃。仪器参数的选择在保证地震采集资料质量上作用很大,特别是前放增益参数的选择直接关系到资料品质的好坏。本文详细论述了使用常规速度型检波器时,System Four(AC)前放增益的选择原则和分析方法,为复杂构造和复杂地表地区的野外地震资料采集施工提供一种分析思路,即在保证信号不溢出的前提下选择增益应按由高到低的顺序进行。

System Four is fifth generation of digital seismograph, in which the advanced functions and powerful multiplechannel recording capacity predict another leap of seismic exploration technique. The correct selection of seismograph parameters plays an important role in guaranteeing the quality of acquired seismic data, and especially the selection of pre-amp gain is directly relative to the data quality. The paper expounded in detail the selection principle and analytic approach of System Four （AC） pre-amp gain in a condition using ordinary velocity type＇s geophone, and provided an analytic idea for determining construction factors of field seismic data acquisition in complex structures and surface area, that is, the selection of gain should be carried out in order from higher to lower in a precondition guaranteeing that the signal does not spill over.