基于三维CT图像的油页岩热解及内部结构变化特征分析

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摘要利用显微CT试验分析系统，对油页岩样进行不同温度下的显微CT扫描，并应用三维衰减系数重建技术对不同温度下油页岩样内部孔、裂隙的演化特征进行分析研究，结果表明：(1) 在20 ℃～600 ℃温度范围内，油页岩样内部孔隙、裂隙的数量和规模发生了质的变化，从致密状态变为孔、裂隙发育的多孔介质。(2) 随着温度的升高，油页岩内部空隙团不断得到连通，从100 ℃时的只局限在一个很小区域的小规模，发展到200 ℃时的连通了油页岩内部立方体区域2个相对面的渗流通道，到600 ℃时，油页岩内部热解率达到了39.80%，最大空隙团在空隙团中的比例达到97.45%，空隙团已基本全部得到连通，形成了连通整个区域的渗流通道。研究结论对分析油页岩原位热解过程中油气的渗流通道的发展规律有重要意义。

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关键词 ：岩石力学, 显微CT, 油页岩, 衰减系数, 空隙团

Abstract：A micro-CT experimental system was used to scan a specimen of oil shale subjected to pyrolysis at different temperatures. From 3D CT images based on X-ray attenuation coefficients，the evolution of pores and cracks in the specimen was analyzed at different stages of pyrolysis. The results show that：(1) From 20 ℃ to 600 ℃，the specimen is transformed from a compact state to a porous medium. (2) At the higher temperatures，increasing numbers of voids become interconnected. At 100 ℃，the voids are restricted to a very small region；but as the temperature is raised to 200 ℃，channels for oil and gas seepage are formed within the study region. At 600 ℃，the pyrolysis rate of the specimen is calculated to reach 39.80%；and the largest void is 97.45% of all the voids. All voids are interconnected into one large void，forming a channel for the seepage of oil and gas running through the entire X-rayed region. The study conclusions are of great significance for discovering how the channels for oil and gas seepage developing during in-situ pyrolysis of oil shale.

Key words： rock mechanics micro-CT oil shale attenuation coefficient void

收稿日期: 2013-03-01

引用本文:

赵静，冯增朝，杨栋，康志勤. 基于三维CT图像的油页岩热解及内部结构变化特征分析[J]. 岩石力学与工程学报, 2014, 33(1): 112-117.
ZHAO Jing，FENG Zengchao，YANG Dong，KANG Zhiqin. STUDY OF PYROLYSIS AND INTERNAL STRUCTURAL VARIATION OF OIL SHALE BASED ON 3D CT IMAGES. , 2014, 33(1): 112-117.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/I1/112

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