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核磁共振T2谱奇异值反演改进算法
An Improved Algorithm for Singular Value Decomposition Inversion of T2 Spectrum in Nuclear Magnetic Resonance
【摘要】 通过分析最佳奇异值保留个数与信噪比的关系,改进了传统的SVD反演算法,提出了一种新的实现非负约束的迭代方案。数值模拟实验和实际应用表明,改进的奇异值分解算法可以适用于低信噪比(5<SNR<100)的T2谱反演,在信噪比极低时仍能较好地保持弛豫谱分布的真实性,具有解算速度快和T2谱分布连续等优点,解决了传统SVD反演算法在实际应用中存在的计算量大和T2谱分布不连续的问题,可以满足核磁共振测井工作的需求。
【Abstract】 The SVD inversion algorithm was improved based on analysis of the relationship between the optimum number of singular value retained and SNR.A new iterative scheme was proposed to achieve the nonnegative constraint.The results of numerical simulations and application indicated that the improved SVD algorithm could adapt to low SNR(5<SNR<100) signal inversion and reduce the amount of computation greatly and keep the continuity of T2 spectrum.This algorithm can well meet the needs of NMR logging.
【关键词】 核磁共振;
T2谱;
核磁测井;
奇异值分解;
地球物理勘探;
【Key words】 nuclear magnetic resonance; T2 spectrum; NMR logging; singular value decomposition; geophysical prospecting;
【Key words】 nuclear magnetic resonance; T2 spectrum; NMR logging; singular value decomposition; geophysical prospecting;
【基金】 四川省地学核技术重点实验室开放基金项目(27-3);吉林大学种子基金项目(498042300423)
- 【文献出处】 吉林大学学报(地球科学版) ,Journal of Jilin University(Earth Science Edition) , 编辑部邮箱 ,2009年06期
- 【分类号】P631.8
- 【被引频次】31
- 【下载频次】379