中国石油大学学报（自然科学版）2013，Vol.37Issue(3)：68-73,82,7.DOI:10.3969/j.issn.1673-5005.2013.03.011
新型核磁共振孔隙介质分析仪的研制
A novel low field nuclear magnetic resonance analyzer for porous media
摘要
Abstract
A novel low field nuclear magnetic resonance (NMR) analyzer for porous media was presented.The analyzer permits analysis on water-saturated full cylindrical cores either in the laboratory or at the oil-well field with one-dimensional or two-dimensional measurements,and it can provide T2 distribution,T1 distribution and 2D T1-T2 maps.The rock test results show that porous media including rock can be measured accurately by one dimensional and two dimensional methods via the analyzer.The sensor consists of an improved Halbach magnet and exchangeable solenoid coils with slotted Faraday shielding.The low cost,linear power amplifier built in IRF510 and IRF640 produces power up to 250 W with gain of about 50 dB.The active de-coupler uses MOSFET controlled by digital circuit to protect the receiver channel.The gain of wideband preamplifier is 56 dB ; the first stage utilizes a low noise wideband discrete RF transistor so that the noise introduced by the preamplifier is negligible.The digital signal processor (DSP) and field programmable gate array (FPGA) are employed to obtain the flexible logic control and powerful data processing,to generate all timing and control signal based on one-dimensional or two-dimensional pulse sequence and obtain the echo train data with digital phase sensitive detection (DPSD).关键词
核磁共振分析仪/低场/孔隙介质/Halbach磁体/探测效率Key words
NMR analyzer/ low field/ porous media/Halbach magnet/ measurement efficiency分类
天文与地球科学引用本文复制引用
肖立志,于慧俊,刘化冰,李新,郭葆鑫,ANFEROVA S,ANFEROV V..新型核磁共振孔隙介质分析仪的研制[J].中国石油大学学报（自然科学版）,2013,37(3):68-73,82,7.基金项目
国家"863"项目(2013AA064605)和引智基地项目(B13010) （2013AA064605）
