Experimental evaluation of oil content and mobility of shale oil in second member of Funing Formation, Subei Basin: A case study of well H

JIANG ZHIGAO; MA XIAODONG; DING ANXU; GAO HEQUN; ZENG JUN; WANG YUMENG; WU YANYAN

doi:10.13809/j.cnki.cn32-1825/te.2024455

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Experimental evaluation of oil content and mobility of shale oil in second member of Funing Formation, Subei Basin: A case study of well H
Vol. 16, Issue 2, Pages: 266-273(2026)
Received：25 December 2024，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2024455
稿件说明：

移动端阅览

姜志高, 马晓东, 丁安徐, 等. 苏北盆地阜二段页岩油含油性及可动性实验评价: 以H井为例[J]. 油气藏评价与开发, 2026, 16(2): 266-273. DOI： 10.13809/j.cnki.cn32-1825/te.2024455.

JIANG Zhigao, MA Xiaodong, DING Anxu, et al. Experimental evaluation of oil content and mobility of shale oil in second member of Funing Formation, Subei Basin: A case study of well H[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 266-273. DOI： 10.13809/j.cnki.cn32-1825/te.2024455.

摘要

鉴于当前实验技术难以准确测定页岩中滞留烃总量，为实现对页岩油含油性的精确评价，本研究以苏北盆地H井密闭取心样品为对象，综合运用冷冻热解、多温阶热解、密闭热释与二维核磁共振（2D-NMR）等多种实验手段，系统开展了含油性及可动性实验评价。通过不同贮存时间的热解对比实验与密闭热释实验，确定了阜二段页岩油轻烃恢复系数为1.99；结合抽提前后热解

峰面积差值，建立了重烃校正公式（0.452 6×

-0.307 9），实现了滞留烃总量的准确计算。进一步利用二维核磁共振技术对不同品质原油进行标定，构建了氢核信号量与油质质量之间的标准曲线，实现了含油量的无损、快速测定；并通过洗油前后核磁谱图对比，明确了可动油与吸附油的

截止值，计算出游离油含量及其占比。实验结果表明，二维核磁共振法测得的含油量与恢复后含油量高度一致，游离油占比与多温阶热解结果也具有良好相关性。本研究建立的“轻烃恢复—重烃校正—核磁标定—可动油识别”技术体系，具有操作相对简便、检测范围广、对样品无损等优点，整体上显著提升了页岩油含油性及可动性评价的准确性与效率，为页岩油甜点识别、储量计算与开发潜力评估提供了重要的实验依据。

Abstract

Given the difficulty in accurately determining the total amount of retained hydrocarbons in shale with current experimental techniques

this study aims to achieve a precise evaluation of shale oil content. Using sealed core samples from well H in the Subei Basin as the subjects

this study employed multiple experimental methods

includi

ng freeze pyrolysis

multi-temperature step pyrolysis

sealed thermal release

and two-dimensional nuclear magnetic resonance (2D-NMR) to systematically evaluate the oil content and mobility. Through comparative pyrolysis experiments at different storage times and sealed thermal release experiments

the light hydrocarbon recovery coefficient for shale oil in the second member of the Funing Formation was determined to be 1.99. Combined with the difference in pyrolysis

peak areas before and after extraction

a heavy hydrocarbon correction formula was established (0.452 6×

-0.307 9)

enabling accurate calculation of the total retained hydrocarbons. Furthermore

2D-NMR technology was used to calibrate crude oil of different qualities

and a standard curve between hydrogen nucleus signal intensity and oil mass was established

enabling non-destructive and rapid determination of oil content. By comparing NMR spectra before and after oil washing

the

₂ cutoff values for movable and adsorbed oil were identified

facilitating the calculation of free oil content and its proportion. The experimental results showed that the oil content measured by the 2D-NMR method was highly consistent with the recovered oil content

and the proportion of free oil showed a good correlation with results from multi-temperature step pyrolysis. The technical framework of “light hydrocarbon recovery-heavy hydrocarbon correction-NMR calibration-movable oil identification” established in this study offers advantages such as relative operational simplicity

a broad detection range

and non-destructiveness to samples. Overall

it significantly improves the accuracy and efficiency of shale oil content and mobility evaluation

providing crucial experimental support for shale oil sweet spot identification

reserve calculation

and development potential assessment.

关键词

Keywords

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