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
收稿日期: 2025-08-12
网络出版日期: 2025-10-31
基金资助
中国海洋石油集团有限公司“十四五”重大科技项目(KJGG2022-0406)
A Method for Correcting T2 Spectrum in Low-permeability Light Oil Sandstone Reservoirs to Improve the Accuracy of NMR-derived Permeability
Received date: 2025-08-12
Online published: 2025-10-31
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．
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 . DOI: 10.11938/cjmr20253178
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.
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