基于数字岩石物理的油页岩热导率模拟  

Effect of cracks on thermal conductivity of oil shale after microwave pyrolysis

作　　者：张永利[1] 涂钰滢 马玉林[1] ZHANG Yongli;TU Yuying;MA Yulin(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《中国石油大学学报（自然科学版）》2023年第6期26-34,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发计划项目(2019YFA0705501)。

摘　　要：利用数字岩心技术,充分考虑岩石的孔隙空间结构对于岩石热导率的影响,对微波辐射作用下油页岩在室温至600℃时内部孔裂隙及裂缝进行三维可视化进行研究。结果表明:垂直层理面的热导率要小于平行层理面的热导率,油页岩强烈的热各向异性导致传热的不均匀,热导率在3个方向上总体呈现下降趋势,并且将模拟值与经验模型进行对比,其精度可接受;各向异性的比值(即平行/垂直热导率)的上界为2.149,各向异性最高出现在热导率最低的区域;油页岩内部结构的变化是导致热导率下降的主要原因;研究成果能够在岩心尺度上对岩石热物性研究提供一定的参考。By leveraging digital core technology,this study comprehensively accounted for the impact of the rock̍s pore space structure on rock thermal conductivity.The research conducted a three-dimensional visualization of internal pore networks,fractures,and fissures within oil shale exposed to microwave radiation across temperatures ranging from room temperature to 600°C.The findings reveal that the thermal conductivity perpendicular to the bedding plane surpassed that parallel to the bedding plane.The strong thermal anisotropy of oil shale results in uneven heat transfer,with thermal conductivity generally decreasing in all three directions.Compared with an empirical model,the accuracy was deemed acceptable.The study ob-served an upper bound for the ratio of anisotropy(=parallel/vertical thermal conductivity)at 2.149.The highest anisotropy was observed in the region with the lowest conductivity.Changes in the internal structure of oil shale is the primary cause for the decrease in thermal conductivity.The research presented in this paper offers valuable insights for the exploration of rock thermal properties at the core scale.

关 键 词：油页岩 热导率 数字岩心 有效热导率 

分 类 号：TE122[石油与天然气工程—油气勘探]