摘要
研究复杂介质地震波传播特征有效而直接的方法是地震物理模拟。目前地震物理模拟数据采集采用的是固定放大增益技术。在地震物理模型实验系统中,前置放大是提高弱反射信号的重要器件。在复杂地质条件下,地震勘探浅层与深层或近炮远炮间的地震反射信号能量相差很大,即地震信号的动态范围较大,固定增益的放大器满足不了深层或远炮间的信号分析。基于这个原因设计的可变增益前置放大器有一定的实用性。
Physical modeling is a direct and effective way to study the seismic wave propagation in complex media.Amplifier with fixed gains is widely used in physical modeling data acquisition system.Preamplifier is an important unit for amplification of weak reflection signals.The energy of seismic reflections from the shallow and deep or at near or far offset varies greatly in complex geologic settings.In other wards,seismic signals change in a great dynamic range.Therefore,amplifiers of fixed gains cannot meet the demand of seismic record and amplifier of variable gains is required.
引文
1Berge P A,Mallick S,ryer G J,et al.Reflection/Transmission coefficients and azimuthal anisotropy in marine seismic studies[J].Geophysical Jonrnal Inter-national,1991,105:241~252
2Ruger A.Variation of P-wave reflectivity with offset and azimuth in anisotropic media[J].Geophysics,1998,63(3):935~947
3郝守玲,赵群.地震物理模型技术的应用与发展[J].勘探地于物理进展,2002,25(2):34~43
4杨勤勇,赵群,王世星等.纵波方位各向异性及其在裂缝检测中的应用[J].石油物探,2006,45(2):177~181
5李剑峰,赵群,郝守玲等.塔河油田碳酸盐岩储层缝洞系统的物理模拟研究[J].石油物探,2005,44(5):428~432
6郝守玲.声波速度测量的频率和尺度效应分析[J].勘探地球物理进展,2005,28(5):309~313
7段九州.放大电路实用设计手册[M].沈阳:辽宁科学技术出版社,2002.230
8Stout D F.运算放大器电路设计手册[M].张保栋,周鑫之译.北京:人民邮电出版社,1983.559