Abstract Experimental data on thermal expansion of rocks are necessary for many applications involving wellbore stability analysis, designing radioactive waste repositories, etc. Such information is especially actual for organic-rich shales that exhibits significant thermal anisotropy and heterogeneity and were not studied comprehensively previously. The coefficient of linear thermal expansion (CLTE) of 23 shale samples from three wells of three oilfields of the Bazhenov and Abalak formations (West Siberia, Russia) was studied with a quartz dilatometer specially adapted for the measurements on standard core plugs. Differential CLTE of shales was determined within temperature range 25–300 °C through every 25 °C for directions parallel and perpendicular to rock bedding. Strong correlations between the CLTE, thermal conductivity, and total organic carbon were established. Detailed profiles of CLTE along studied wells were obtained due to application of the optical scanning technique. These profiles fit well with total organic carbon obtained with pyrolysis. CLTE anisotropy was assessed for organic-rich shale samples together with thermal conductivity anisotropy. The thermal conductivity measurements before and after heating allowed estimation of structural changes in rock samples during heating.

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富有机质页岩热膨胀实验研究

摘要 岩石热膨胀实验数据对于井筒稳定性分析、放射性废物处置库设计等许多应用来说是必要的。这些信息对于表现出显着热各向异性和非均质性且以前没有进行全面研究的富有机质页岩尤为实际。使用专门适用于标准岩心塞测量的石英膨胀计研究了来自 Bazhenov 和 Abalak 地层（俄罗斯西西伯利亚）三个油田的三个井的 23 个页岩样品的线性热膨胀系数 (CLTE)。对于平行和垂直于岩层的方向，在 25-300°C 到每 25°C 的温度范围内确定了页岩的差异 CLTE。CLTE、热导率、和总有机碳的建立。由于应用了光学扫描技术，获得了沿研究井的 CLTE 的详细剖面。这些分布与通过热解获得的总有机碳非常吻合。评估了富含有机质页岩样品的 CLTE 各向异性以及热导率各向异性。加热前后的热导率测量允许估计加热过程中岩石样品的结构变化。