基于低场核磁共振的抚顺油页岩孔隙连通性演化研究

刘志军; 杨栋; 邵继喜; 胡耀青

doi:10.11938/cjmr20182687

波谱学杂志 >

2019 , Vol. 36 >Issue 3: 309 - 318

DOI: https://doi.org/10.11938/cjmr20182687

研究论文

基于低场核磁共振的抚顺油页岩孔隙连通性演化研究

刘志军 ,
杨栋 ,
邵继喜 ,
胡耀青

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1. 太原理工大学国家油页岩原位注热开采分中心, 山西太原 030024;
2. 黑龙江科技大学矿业工程学院, 黑龙江哈尔滨 150022;
3. 太原理工大学原位改性采矿教育部重点实验室, 山西太原 030024;
4. 广州市市政工程试验检测有限公司, 广东广州 510060

收稿日期: 2018-10-18

网络出版日期: 2018-11-29

基金资助

国家自然科学基金资助项目（51574173，51574115）.

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Evolution of Pore Connectivity in the Fushun Oil Shale by Low-Field Nuclear Magnetic Resonance Spectroscopy

LIU Zhi-jun ,
YANG Dong ,
SHAO Ji-xi ,
HU Yao-qing

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1. The In-situ Steam Injection Branch, State Center for Research and Development of Oil Shale Exploitation, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Mining Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China;
3. Key Laboratory of In-situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;
4. Guangzhou Municipal Engineering Testing Co. Ltd., Guangzhou 510060, China

Received date: 2018-10-18

Online published: 2018-11-29

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摘要

油页岩原位注热开采过程中，储层内部孔隙结构的连通性直接影响载热介质的流动行为和传热效率，同时对油气产物的扩散和流动行为起控制作用.本文利用低场核磁共振（LF NMR）技术，考察了不同热解终温（23~650℃）处理时，饱和水及束缚水状态下抚顺油页岩的T₂谱，分析了可动流体T₂截止值、束缚流体孔隙度、饱和流体孔隙度、渗透率等NMR孔隙参数，定量研究了随热解终温升高，抚顺油页岩孔隙结构的连通性演化规律.研究结果表明热解终温对抚顺油页岩孔隙连通性及渗透率的变化起控制作用，且可动流体孔隙度对总孔隙度的增加起主要促进作用，这说明热解终温升高加大了渗透率及油气产物的输运能力.本文为深入认识油页岩原位热解过程中孔隙结构的演化提供了依据.

关键词： 油页岩; 原位热解; 低场核磁共振; 孔隙度; 连通性

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刘志军 , 杨栋 , 邵继喜 , 胡耀青 . 基于低场核磁共振的抚顺油页岩孔隙连通性演化研究[J]. 波谱学杂志, 2019 , 36(3) : 309 -318 . DOI: 10.11938/cjmr20182687

Abstract

During in-situ exploitation of the oil shale, the connectivity of the pore structure of the reservoir directly affects not only the flow behavior and heat transfer efficiency of the heat-carrying medium, but also the diffusion and flow behaviors of the oil and gas. In this study, the T₂ spectra of saturated water and bound water in samples from the Fushun oil shale were measured with low-field nuclear magnetic resonance at different final pyrolysis temperatures (23~650℃). NMR pore parameters, including T₂ cutoff value of movable fluid, bound fluid porosity, saturated fluid porosity and permeability, were analyzed. The evolution of pore connectivity of the oil shale with final pyrolysis temperature was studied quantitatively. The results demonstrated that final pyrolysis temperature affected the variations of pore connectivity and the permeability of oil shale. The increase of total porosity could be attributed mainly to the increments of movable fluid. These results indicated that increases in final pyrolysis temperature enhanced the permeability and transport of oil and gas, providing a basis for further understanding of the evolution of pore structure in oil shale in-situ pyrolysis.

Key words： oil shale; in-situ pyrolysis; low-field nuclear magnetic resonance; porosity; connectivity

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