核磁共振频率对蚀变火山岩横向驰豫时间的影响

张丽华; 潘保芝; 单刚义; 王敏; 曹玥

doi:10.3969/j.issn.1006-6535.2023.02.003

特种油气藏 >

2023 , Vol. 30 >Issue 2: 20 - 25

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.02.003

地质勘探

核磁共振频率对蚀变火山岩横向驰豫时间的影响

张丽华 ,
潘保芝 ,
单刚义 ,
王敏 ,
曹玥

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1.吉林大学,吉林长春 130026;
2.中国石化东北油气分公司,吉林长春 130026

张丽华(1974—),女,教授级高级工程师,1996年毕业于长春地质学院勘查技术与工程专业,2009年毕业于吉林大学地球探测科学与技术专业,获博士学位,现从事石油地球理测井的处理与解释研究工作。

收稿日期: 2022-05-12

修回日期: 2022-11-24

网络出版日期: 2023-05-29

基金资助

国家自然科学基金面上项目“IFCD油页岩原位转化过程流-热-应力-化学耦合数值模拟研究”(NSFC 42072323)

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Effects of Nuclear Magnetic Resonance Frequency on the Transverse Relaxation Time of Altered Volcanic Rocks

Zhang Lihua ,
Pan Baozhi ,
Shan Gangyi ,
Wang Min ,
Cao Yue

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1. Jilin University, Changchun, Jilin 130026, China;
2. Northeast Oil & Gas Branch of Sinopec, Changchun, Jilin 130026, China

Received date: 2022-05-12

Revised date: 2022-11-24

Online published: 2023-05-29

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摘要

为了研究频率对蚀变火山岩横向驰豫时间T₂的影响,选取了龙凤山地区的蚀变火山岩岩样,进行了X射线衍射全岩和黏土分析,对其中代表性样品进行了2 MHz和12 MHz的核磁共振测量。研究表明:蚀变的黏土矿物以绿泥石为主;随着核磁共振频率的增大,T₂谱有向左偏移的趋势,这种偏移会导致对孔隙结构的错误认识,可以通过拟合公式进行偏移校正。该校正方法可以指导其他频率核磁仪器测量结果广泛地应用。

关键词： 蚀变火山岩; 核磁共振; 驰豫时间; 磁场梯度; 绿泥石

本文引用格式

张丽华 , 潘保芝 , 单刚义 , 王敏 , 曹玥 . 核磁共振频率对蚀变火山岩横向驰豫时间的影响[J]. 特种油气藏, 2023 , 30(2) : 20 -25 . DOI: 10.3969/j.issn.1006-6535.2023.02.003

Abstract

In order to study the effect of frequency on the transverse chirality time T₂ of altered volcanic rocks, the altered volcanic rock samples from Longfeng Mountain area were selected for X-ray diffraction whole-rock and clay analysis, and NMR measurements at 2 MHz and 12 MHz were performed on representative samples. The results of the study show that the altered clay minerals are dominated by chlorite; the T₂ spectrum tends to shift to the left as the NMR frequency increases; this shift can lead to a false perception of the pore structure and can be corrected for the shift by the fitting formula. This correction method can guide the application of NMR instrument measurements at other frequencies in wells.

Key words： altered volcanic rocks; NMR; relaxation time; magnetic field gradient; chlorite

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