[1]楊居朋,湯天知,陳濤,等.核磁共振測井儀CPMG脈沖射頻場相位研究[J].測井技術,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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核磁共振測井儀CPMG脈沖射頻場相位研究()
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《測井技術》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第43卷
期數:
2019年03期
頁碼:
288-290
欄目:
測井儀器
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
文章編號:
1004-1338(2019)03-0288-03
作者:
楊居朋12 湯天知12 陳濤12 陳江浩12 李夢春12 王茂林1
(1.中國石油集團測井有限公司, 陜西 西安 710077; 2.中國石油天然氣集團公司測井重點實驗室, 陜西 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
關鍵詞:
核磁共振測井儀 CPMG時序 射頻場相位 橫向弛豫時間 核磁共振自旋系統
Keywords:
NMR logging tool CPMG sequence RF field phase transverse relaxation time NMR spin system
分類號:
P631.84
DOI:
10.16489/j.issn.1004-1338.2019.03.013
文獻標志碼:
A
摘要:
核磁共振測井儀通過CPMG脈沖時序測量地層中質子弛豫時間得到地層孔隙度、孔隙結構、流體特性等信息。為提高核磁共振測井儀的信噪比,通過電磁場理論方法研究CPMG脈沖射頻場初始相位與井下核磁共振自旋信號幅度關系,由理論計算和實驗驗證相得出CPMG時序第1個90°脈沖射頻電場初始相位為π/2,后續180°鏡像脈沖射頻電場初始相位為π時核磁共振回波幅度最大,為提高信噪比提供了理論依據。
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.

參考文獻/References:

[1] 肖立志. 核磁共振成像測井與巖石核磁共振及其應用 [M]. 北京: 科學出版社, 1998. [2] 馮慈璋, 馬西奎. 工程電磁場導論 [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] 王忠東, 肖立志, 劉堂宴. 核磁共振弛豫信號多指數反演新方法及其應用 [J]. 中國科學, 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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備注/Memo

備注/Memo:
基金項目: “十三五”國家科技重大專項課題“隨鉆地層評價成像測井系列”(2017ZX05019-002); 中國石油天然氣集團公司課題“偏心型核磁共振測井儀器研制”(2016B-3703) 第一作者: 楊居朋,男,1985年生,工程師,從事核磁共振測井儀器信號采集處理與控制系統研發。E-mail:[email protected]
更新日期/Last Update: 2019-08-30
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