回波间隔对核磁共振表观孔隙度的影响及矫正方法

doi:10.11938/cjmr20192771

波谱学杂志 ›› 2020, Vol. 37 ›› Issue (2): 172-181.doi: 10.11938/cjmr20192771

回波间隔对核磁共振表观孔隙度的影响及矫正方法

张宫, 何宗斌, 曹文倩, 陈瑶

长江大学, 油气资源与勘探技术教育部重点实验室, 湖北武汉 430100

收稿日期:2019-07-22 出版日期:2020-06-05 发布日期:2019-08-26
通讯作者: 张宫,Tel:15652663116,E-mail:zhanggong@yangtzeu.edu.cn. E-mail:zhanggong@yangtzeu.edu.cn
基金资助:
湖北省教育厅科研计划科学技术研究项目（Q20181320）；油气资源与勘探技术教育部重点实验室（长江大学）开放基金资助项目（K2018-17）.

Effects of Echo Time on NMR Apparent Porosity and Correction Methods

ZHANG Gong, HE Zong-bin, CAO Wen-qian, CHEN Yao

Key Laboratory of Exploration Technologies for Oil and Gas Resources of Education Ministry of Yangtze University, Wuhan 430100, China

Received:2019-07-22 Online:2020-06-05 Published:2019-08-26

1. 补充材料.pdf(162KB)

摘要/Abstract

摘要： 本文对具有特定横向弛豫时间（T₂）的硫酸铜溶液进行了多回波间隔（T_E）的核磁共振（NMR）实验，并利用数值模拟对32组具有不同弛豫分量的模型进行了变T_E模拟实验，定量研究了T_E对致密油气、页岩气等低孔低渗储层NMR孔隙度的影响规律.实验结果表明，随着T_E的增大，各T₂弛豫组分NMR孔隙度先维持在100%左右，然后迅速衰减，当T_E增加到一定数值时，趋近于0；不同T₂弛豫组分NMR孔隙度开始迅速衰减及最后变为0的T_E值存在显著差异.根据不同T₂弛豫组分NMR孔隙度与T_E的关系，将整个NMR测量分为无损测量区、快速衰减区、无效参数区和仪器盲区4个区域.对特定弛豫组分而言，在快速衰减区弛豫组分损失量与T_E呈对数关系，本文还给出了该区域NMR孔隙度的校正公式及方法.

关键词: 核磁共振(NMR), 回波间隔, NMR孔隙度, 组分损失, 数值模拟

Abstract: In order to study the effect of echo time (T_E) on nuclear magnetic resonance (NMR) porosity in tight oil (gas) and shale reservoir, multi-T_E NMR experiments and NMR numerical simulations were performed on CuSO₄ solutions with specific transversal relaxation time (T₂). The results showed that the normalization NMR porosity of different T₂ relaxation components remained 100% in the low T_E region, and rapidly decreased with increasing T_E. When T_E was greater than certain value, the normalization NMR porosity dropped to zero. However, the T_E value at which the normalization NMR porosity began to decrease and the T_E value at which the normalization NMR porosity dropped to zero were different for different NMR relaxation component. Moreover, the whole NMR measurement was divided into lossless zone, fast decay zone, invalid parameter zone and instrument blind zone, based on the relationships between the normalization NMR porosity of different relaxation component and T_E. For each specific relaxation component, a logarithmic relationship was demonstrated between the loss of relaxation component and T_E in the fast decay zone. A method for NMR porosity correction was given.

Key words: nuclear magnetic resonance (NMR), echo time, NMR porosity, component loss, numerical simulation

中图分类号:

O482.53

张宫, 何宗斌, 曹文倩, 陈瑶. 回波间隔对核磁共振表观孔隙度的影响及矫正方法[J]. 波谱学杂志, 2020, 37(2): 172-181.

ZHANG Gong, HE Zong-bin, CAO Wen-qian, CHEN Yao. Effects of Echo Time on NMR Apparent Porosity and Correction Methods[J]. Chinese Journal of Magnetic Resonance, 2020, 37(2): 172-181.

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回波间隔对核磁共振表观孔隙度的影响及矫正方法

Effects of Echo Time on NMR Apparent Porosity and Correction Methods

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