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.
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.
作者
刘志军
杨栋
邵继喜
胡耀青
LIU Zhi-jun;YANG Dong;SHAO Ji-xi;HU Yao-qing(The In-situ Steam Injection Branch,State Center for Research and Development of Oil Shale Exploitation,Taiyuan University of Technology,Taiyuan 030024,China;School of Mining Engineering,Heilongjiang University of Science and Technology,Harbin 150022,China;Key Laboratory of In-situ Property-Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;Guangzhou Municipal Engineering Testing Co.Ltd.,Guangzhou 510060,China)
出处
《波谱学杂志》
CAS
北大核心
2019年第3期309-318,共10页
Chinese Journal of Magnetic Resonance
基金
国家自然科学基金资助项目(51574173,51574115)
关键词
油页岩
原位热解
低场核磁共振
孔隙度
连通性
oil shale
in-situ pyrolysis
low-field nuclear magnetic resonance
porosity
connectivity
