波谱学杂志 ›› 2006, Vol. 23 ›› Issue (1): 81-87.

• 研究简报 • 上一篇    下一篇

对多孔介质NMR实验弛豫时间分布的实现

  

  1. 兰州大学 现代物理系, 甘肃 兰州 730000
  • 收稿日期:2005-01-24 修回日期:2005-09-05 出版日期:2006-03-05 发布日期:2006-03-05

Measurement of T1 Relaxation Time and Its Distribution In Porous Media

  1. Department of Modern Physics, Lanzhou University, Lanzhou 730000,China
  • Received:2005-01-24 Revised:2005-09-05 Online:2006-03-05 Published:2006-03-05

摘要:

报道了人工岩石样品——多孔介质的NMR实验的弛豫时间T1的测量数据及其处理分析方法. 文中采用Levenberg-Marquardt(L-M)拟合技术, 对实验数据利用3种不同的模型进行拟合:单指数,双指数和多指数模型拟合,特别是多指数拟合的弛豫时间τ -分布曲线. 各种方法利用价值函数χ2进行对比, 与实验结果进行了比较.

关键词: 核磁共振测量, 多孔介质, L-M拟合算法, 价值函数&chi, 2, 最优化, &tau, -分布曲线

Abstract:

The paper reports measurements of T1 relaxation time and its distribution in porous media. Three models: the single-exponential model, the double-exponential model, and the multi-exponential model (τ -distribution curves) were used to fit the experimental data and compared for their performance. The Levenberg-Marquardt algorithm was used to perform nonlinear regression.

Key words: NMR, porous medium, nonlinear regression,  T1 relaxation time

中图分类号: