福彩3d中间值走势图:
[1]杨居朋,汤天知,陈涛,等.核磁共振测井仪CPMG脉冲射频场相位研究[J].测井技术,2019,43(03):288-290.[doi:10.16489/j.issn.1004-1338.2019.03.013]
 YANG Jupeng,TANG Tianzhi,CHEN Tao,et al.Study on the Phase of CPMG Pulse Radiofrequency Field of Nuclear Magnetic Resonance Logging Tool[J].WELL LOGGING TECHNOLOGY,2019,43(03):288-290.[doi:10.16489/j.issn.1004-1338.2019.03.013]
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核磁共振测井仪CPMG脉冲射频场相位研究()
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《测井技术》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第43卷
期数:
2019年03期
页码:
288-290
栏目:
测井仪器
出版日期:
2019-06-30

文章信息/Info

Title:
Study on the Phase of CPMG Pulse Radiofrequency Field of Nuclear Magnetic Resonance Logging Tool
文章编号:
1004-1338(2019)03-0288-03
作者:
杨居朋12 汤天知12 陈涛12 陈江浩12 李梦春12 王茂林1
(1.中国石油集团测井有限公司, 陕西 西安 710077; 2.中国石油天然气集团公司测井重点实验室, 陕西 西安 710077)
Author(s):
YANG Jupeng12 TANG Tianzhi12 CHEN Tao12 CHEN Jianghao12 LI Mengchun12 WANG Maolin1
YANG Jupeng1,2, TANG Tianzhi1,2, CHEN Tao1,2, CHEN Jianghao1,2, LI Mengchun1,2, WANG Maolin1
关键词:
核磁共振测井仪 CPMG时序 射频场相位 横向弛豫时间 核磁共振自旋系统
Keywords:
NMR logging tool CPMG sequence RF field phase transverse relaxation time NMR spin system
分类号:
P631.84
DOI:
10.16489/j.issn.1004-1338.2019.03.013
文献标志码:
A
摘要:
核磁共振测井仪通过CPMG脉冲时序测量地层中质子弛豫时间得到地层孔隙度、孔隙结构、流体特性等信息。为提高核磁共振测井仪的信噪比,通过电磁场理论方法研究CPMG脉冲射频场初始相位与井下核磁共振自旋信号幅度关系,由理论计算和实验验证相得出CPMG时序第1个90°脉冲射频电场初始相位为π/2,后续180°镜像脉冲射频电场初始相位为π时核磁共振回波幅度最大,为提高信噪比提供了理论依据。
Abstract:
NMR(Nuclear magnetic resonance)logging tool records proton relaxation time, from which porosity, pore structure, fluid properties, etc., are derived. In order to improve the signal-to-noise ratio of the NMR logging tool, the relationship between the initial phase of CPMG pulsed radiofrequency field and the amplitude of downhole NMR spin signal based on electromagnetic field theory was investigated. Based on theoretical calculation and experimental verification, it is concluded that when the initial phase of the first 90°pulsed RF field is π/2 and the initial phase of the 180° mirror image RF field is π, the amplitude of NMR echo is the largest. This conclusion provides a theoretical basis for improving signal-to-noise ratio.

参考文献/References:

福彩3d之家杀号 www.nzrms.tw [1] 肖立志. 核磁共振成像测井与岩石核磁共振及其应用 [M]. 北京: 科学出版社, 1998. [2] 冯慈璋, 马西奎. 工程电磁场导论 [M]. 北京: 高等教育出版社, 2000. [3] GEORGE R C. NMR logging principles & applications [Z]. Halliburton Energy Services, 1999. [4] 王忠东, 肖立志, 刘堂宴. 核磁共振弛豫信号多指数反演新方法及其应用 [J]. 中国科学, 2003, 33(4): 323-324. [5] SUN B Q, DUNN K J. Methods and limitations of NMR data inversion for fluid typing [J]. Journal of Magnetic Resonance, 2004, 169(1): 118-128.

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备注/Memo

备注/Memo:
基金项目: “十三五”国家科技重大专项课题“随钻地层评价成像测井系列”(2017ZX05019-002); 中国石油天然气集团公司课题“偏心型核磁共振测井仪器研制”(2016B-3703) 第一作者: 杨居朋,男,1985年生,工程师,从事核磁共振测井仪器信号采集处理与控制系统研发。E-mail:[email protected]
更新日期/Last Update: 2019-08-30