Mobile 2D NMR quantitative evaluation method and its application at shale oil wellsite: A case study of the second member of Funing Formation, Subei Basin

ZOU YOULONG; LI JUN; LIU JILONG; GUO BAOXIN; WANG LIANG

doi:10.13809/j.cnki.cn32-1825/te.2025436

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Mobile 2D NMR quantitative evaluation method and its application at shale oil wellsite: A case study of the second member of Funing Formation, Subei Basin
Vol. 16, Issue 2, Pages: 286-300(2026)
Received：30 December 2025，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2025436
稿件说明：

移动端阅览

邹友龙, 李军, 刘继龙, 等. 页岩油井场移动式二维核磁共振定量评价方法及应用: 以苏北盆地阜宁组二段为例[J]. 油气藏评价与开发, 2026, 16(2): 286-300. DOI： 10.13809/j.cnki.cn32-1825/te.2025436.

ZOU Youlong, LI Jun, LIU Jilong, et al. Mobile 2D NMR quantitative evaluation method and its application at shale oil wellsite: A case study of the second member of Funing Formation, Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 286-300. DOI： 10.13809/j.cnki.cn32-1825/te.2025436.

摘要

孔隙度和含油饱和度是页岩油储层评价中的关键参数，但实验室测量目前面临困难，而井场移动式二维核磁共振测量能够最大程度地避免轻烃散失的影响，实现对页岩岩心及时测量，获得较准确的孔隙度、含油饱和度和可动油饱和度参数。首先，针对苏北盆地阜宁组二段（以下简称阜二段）页岩油储层地质特征，基于二维核磁共振专项实验构建实验室条件下阜二段页岩油储层二维核磁流体类型识别图版，包括吸附油、束缚油、可动油、毛管束缚水、黏土水等流体组分识别。实验室测量与井场测量的温度、压力条件相同，利用实验室高精度二维核磁测量确定的各流体组分弛豫时间截止值标定井场测量的二维核磁谱，建立基于井场移动式二维核磁流体识别图版，进而确定孔隙度、含油饱和度和可动油饱和度的评价模型。井场、井下二维核磁测量均采用相同的回波间隔和共振频率，以确保二者二维核磁谱形态一致，再以井场二维核磁谱为桥梁，运用平移法对井下测量的核磁谱进行温度、压力影响的校正，从而建立基于井下二维核磁共振测井的页岩油储层流体识别图版与定量评价模型。利用这套技术在苏北盆地阜二段页岩油储层区域范围内的4口井中应用和对比验证，井场核磁与井下核磁测量结果具有一致性，同时与实验室测量结果高度吻合，展现移动式二维核磁测量技术在页岩孔隙度、含油饱和度和可动油饱和度评价方面具有广阔的应用前景。

Abstract

Porosity and oil saturation are critical parameters in shale oil reservoir evaluation

but current laboratory measurements face challenges. In contrast

using wellsite mobile two-dimensional nuclear magnetic resonance (2D NMR) measurements can minimize the impact of light hydrocarbon loss

allowing for timely measurements of shale cores and the acquisition of relatively accurate parameters of porosity

oil saturation

and movable oil saturation. First

based on the geological characteristics of shale oil reservoirs in the second member of the Funing Formation (Fu-2 member) in the Subei Basin

a 2D NMR fluid type identification chart was constructed under laboratory conditions based on specialized experiments. This chart enabled the identification of fluid components including adsorbed oil

bound oil

movable oil

capillary-bound water

and clay water. Laboratory measurements were conducted under the same temperature and pressure conditions as wellsite measurements. The relaxation-time cutoff values for each fluid component

determined by high-precision laboratory 2D NMR measurements

were used to calibrate the field 2D NMR spectra. Then

a wellsite mobile 2D NMR fluid identification chart was established

leading to the development of evaluation models for porosity

oil saturation

and movable oil saturation. Both wellsite and downhole 2D NMR measurements employed the same echo spacing and resonance frequency to ensure consistent shapes of their 2D NMR spectra. Then

with the wellsite 2D NMR spectrum as a reference

a translation method was applied to correct the downhole NMR spectra for temperature and pressure effects. Consequently

a fluid identification chart and quantitative evaluation model for shale oil reservoirs based on downhole 2D NMR logging were established. This technique was applied and validated through comparison in four wells within the shale oil reservoir area of the Fu-2 member in the Subei Basin. The results demonstrated consistency between wellsite and downhole NMR measurements and showed a high agreement with laboratory results. These findings demonstrate the broad application prospects of mobile 2D NMR measurement technology for evaluating shale porosity

oil saturation

and movable oil content.

关键词

Keywords

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