基于虚拟仪器的过套管测井微弱信号检测研究  

Weak signal detection of cased-hole log based on virtual instrument

作　　者：姜明[1] 柯式镇[1] 尹洪东[1] 张兴文[1] 王维[1] 马连钢 舒心[1] 柯文俊[1] 

机构地区：[1]中国石油大学

出　　处：《石油仪器》2013年第5期17-19,1,共3页Petroleum Instruments

摘　　要：有效地检测微弱信号是过套管仪器的核心技术之一。文章介绍了在频域进行的一种高质量的微弱信号检测方法,并用LabVIEW平台,设计出虚拟锁定放大系统,对实验室产生的模拟过套管测井微弱信号进行采集并作研究分析。试验表明,虚拟锁定放大系统可以较好地检测出信噪比不小于-30dB或最小检测信号幅值不低于10nV的微弱信号。因而,该系统可用于过套管微弱信号检测。Detection of weak signals is one of the key technologies in cased-hole tools. An approach of high sensitive detection of weak signals in frequency domain is presented. The virtual system of Lock-in Amplifier based on LabVIEW is applied to detect the weak signals generated in laboratory. It is shown that the weak signals with greater than-30dB in SNR or 10nV in amplitude can be detected by virtual instrument of Lock-in Amplifier. Therefore, the virtual system can be used in detecting the weak signals through casing.

关 键 词：过套管 微弱信号检测 锁定放大 LABVIEW 

分 类 号：P631.53[天文地球—地质矿产勘探]