轻质油低渗砂岩储层T2谱校正提高核磁共振渗透率准确性方法

doi:10.11938/cjmr20253178

摘要/Abstract

摘要：

在利用核磁共振测井资料评价南海东部低孔渗轻质油层过程中，普遍存在渗透率高估的现象．为提高核磁共振渗透率的计算准确性，需深入分析其偏高成因并建立相应的校正方法．本文系统开展了不同饱和状态（包括饱含水、束缚水、饱含油及残余油状态）下的核磁共振横向弛豫时间（T₂）谱实验．通过对比同一岩心在饱含水和含油状态下的T₂谱，发现轻质油会使T₂谱中大孔分布明显右移，而小孔部分基本保持不变，表明轻质油是引起T₂谱异常及核磁共振渗透率偏差的主要原因．基于此，通过岩心分类确定了不同类型储层的T₂截止值，建立了针对大孔孔隙组分进行校正的T₂谱校正方法．结果表明，该方法能够将含轻质油层的T₂谱有效校正到饱含水状态，显著提高了核磁共振渗透率的准确性．

关键词: 核磁共振测井, T₂谱校正, 渗透率, 低渗砂岩, 轻质油

Abstract:

In the evaluation of low-porosity and low-permeability light oil reservoirs in the eastern South China Sea using nuclear magnetic resonance(NMR) logging data, the permeability values tend to be overestimated. To improve the accuracy of NMR-derived permeability calculations, it is essential to thoroughly analyze the causes of this overestimation and establish corresponding correction methods. This paper systematically conducted NMR transverse relaxation time (T₂) spectroscopy experiments under different saturation states, including water-saturated, bound water, oil-saturated, and residual oil states. By comparing the T₂ spectra of the same core sample under water-saturated and oil-containing states, it was observed that light crude oil causes a significant rightward shift in the distribution of macropores within the T₂ spectrum, while the distribution of micropores remains largely unchanged. This indicates that light oil is the primary cause of T₂ spectrum anomalies and NMR permeability deviations. Based on this finding, T₂ cutoff values for different reservoir types were determined through core classification, and a T₂ spectrum correction method calibrated for macropore components was established. Results demonstrate that this method effectively corrects T₂ spectra from light oil-bearing reservoirs to fully water-saturated state, significantly enhancing the accuracy of NMR-derived permeability measurements.

Key words: nuclear magnetic resonance (NMR), T₂ spectrum correction, permeability, low permeability sandstone, light crude oil

中图分类号:

O482.53

管耀, 冯进, 王清辉, 周开金, 刘伟男, 石磊. 轻质油低渗砂岩储层T₂谱校正提高核磁共振渗透率准确性方法[J]. 波谱学杂志, 2026, 43(1): 94-103.

GUAN Yao, FENG Jin, WANG Qinghui, ZHOU Kaijin, LIU Weinan, SHI Lei. A Method for Correcting T₂ Spectrum in Low-permeability Light Oil Sandstone Reservoirs to Improve the Accuray of NMR-derived Permeability[J]. Chinese Journal of Magnetic Resonance, 2026, 43(1): 94-103.

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岩心编号	渗透率/mD	T₂截止值/ms	束缚水饱和度/(%)	核磁共振孔隙度/(%)			T₂几何均值/ms
岩心编号	渗透率/mD	T₂截止值/ms	束缚水饱和度/(%)	饱含水状态	饱含油状态	残余油状态	饱含水状态	饱含油状态	残余油状态
1	8.35	27.71	51.09	10.96	10.87	11.03	19.67	78.46	81.63
2	7.74	24.33	48.26	10.05	10.26	10.01	18.82	90.61	92.23
3	15.74	48.45	44.47	10.48	9.89	10.23	41.34	88.73	68.85
4	1.09	16.09	55.65	4.96	5.17	4.88	9.07	29.27	21.68
5	23.22	63.95	42.05	12.96	13.16	12.87	47.42	73.56	83.36
6	6.04	57.08	46.01	10.89	10.80	10.95	36.92	67.73	60.06
7	41.48	22.76	51.74	10.36	9.98	10.16	16.23	102.23	56.95
8	40.34	20.21	49.81	10.42	10.53	10.36	13.82	76.84	54.11
9	40.88	37.87	48.39	11.82	11.77	11.94	27.75	67.70	39.38
10	32.21	41.02	47.68	11.20	11.13	11.25	35.23	62.69	58.63

轻质油低渗砂岩储层T₂谱校正提高核磁共振渗透率准确性方法

A Method for Correcting T₂ Spectrum in Low-permeability Light Oil Sandstone Reservoirs to Improve the Accuray of NMR-derived Permeability

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