李浩涵,张聪,徐兴友,陈维堃,白静,张远
LI Haohan,ZHANG Cong,XU Xingyou,CHEN Weikun,BAI Jing,ZHANG Yuan

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国地质调查局油气资源调查中心

摘要(Abstract)：

针对现有评价方法在老井页岩油储层可动性分析中存在适用性不足的问题，以松辽盆地青山口组老井页岩样品为研究对象，提出一种结合逐温干燥实验与T_1-T_2谱核磁共振技术的评价方法。首先通过逐温干燥实验，依托核磁共振T_1-T_2谱精准还原孔隙中水分的动态流失过程；随后将样品干燥温度控制在80℃以模拟实际地层温度下的孔隙环境，进而量化游离水在孔隙中的侵占程度；在此模拟条件下，开展饱和油、离心、核磁共振系列实验，实现对页岩油可动性的系统评价。结果表明：与传统60℃标准干燥温度相比，80℃地层温度干燥条件下样品的可动孔隙度平均提升0.54%；干燥过程中结构水含量保持稳定、游离水含量显著降低，进一步验证了80℃及更高干燥温度在实验中的有效性；评价结果显示，JYY1井页岩油可动油量为1.18～1.60 mg/g，可动率为13.33%～19.45%,SYY1井、SYY2井页岩油可动油量为3.11～4.59 mg/g，可动率为11.11%～14.92%，结果均处于合理区间。对比而言，传统评价方法得出的页岩油可动率为5.82%～25.38%，数据波动超出合理范围，充分证明本文方法能够更精准、合理地实现老井页岩油可动性评价，为老井页岩油资源潜力评估提供可靠技术支撑。
Aiming at the problem of insufficient adaptability of existing evaluation methods in analyzing shale oil mobility in old wells, an evaluation approach combining stepwise-temperature drying experiments and T_1-T_2 spectra nuclear magnetic resonance(NMR) is proposed using shale samples from Qingshankou Formation in Songliao Basin as research object. Firstly, stepwise-temperature drying experiments are conducted to precisely reconstruct dynamic water loss process in pores based on T_1-T_2 nuclear magnetic resonance(NMR) spectra. Then, samples drying-temperatures are controlled at 80 ℃ to simulate the actual reservoir temperature, thereby quantifying the occupation degree of free water in the pores. Under these simulated conditions, a series of oil saturation,centrifugation and NMR experiments are carried out to systematically evaluate shale oil mobility. The results show that, compared with the conventional standard of 60 ℃, samples dried at 80 ℃ exhibit an average increase of 0.54% in movable porosity. During the drying process, structural water content remains stable, while free water content decreases significantly, further verifying the effectiveness of drying at 80 ℃ and higher temperatures in the experiment. The evaluation results show that movable oil content in Well JYY1 is 1.18-1.60 mg/g, with mobility rate of 13.33%-19.45%. Movable oil contents in Well SYY1 and Well SYY2 are 3.11-4.59 mg/g, with mobility rate of 11.11%-14.92%(all within reasonable range). In contrast, conventional evaluation methods yield mobility rate of 5.82%-25.38%, with data fluctuation exceeding reasonable range, which fully demonstrates that the proposed method can achieve more precise and reasonable mobility evaluation of shale oil in old wells, providing reliable technical support for assessing shale oil resource potential in old wells.

关键词(KeyWords)： 页岩油可动性;评价方法;松辽盆地;青山口组
shale oil mobility;evaluation method;Songliao Basin;Qingshankou Formation

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年项目“薄纹层成因机制及其对陆相页岩储集空间的控制作用”（42302177）;国家自然科学基金项目“中扬子古隆起周缘震旦―寒武系页岩气源储耦合演化及保存机理”（U2244208）;; 中国地质调查局地质调查项目“华北地台及其周缘页岩油气地质调查与评价”（DD20240050）

作者(Author): 李浩涵,张聪,徐兴友,陈维堃,白静,张远
LI Haohan,ZHANG Cong,XU Xingyou,CHEN Weikun,BAI Jing,ZHANG Yuan

DOI: 10.19597/J.ISSN.1000-3754.202509061

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