基于我国能源分布“相对富煤、贫油、少气”的特点和复杂国际地缘政治背景，当前我国正积极引导煤炭行业清洁低碳转型发展。其中富油煤在提高油气转化效率、降低经济成本方面具有更好优势，但现阶段的煤炭开采方法如煤炭地下气化（Underground Coal Gasification，UCG）、地下原位热解（Underground In-situ Pyrolysis，UIP）等技术存在明显缺点，亟待发展新型高效的富油煤地下原位热解技术。目前，相关学者探索性提出了一种新型的富油煤地下隔层式原位热解开采（Underground Compartmentalized In-situ Pyrolysis，UCIP）技术，将UCIP技术应用于实际开采工程中，最重要的是保证加热过程中底板岩层的传热效能和热稳定性，因此，明确底板岩层的传热性能衰减机理和热损伤机理对保障开采效率至关重要。本文通过热参数测试、物理参数测试、核磁共振（NMR）、X射线衍射仪（XRD）和扫描电子显微镜（SEM）等系统化测试手段，揭示了地下隔层式原位热解过程中富油煤底板岩层的传热性能衰减机理和热损伤机理，评估了底板岩层的传热效能和热稳定性，提出了适宜的加热温度区间和加热时间范围，并给出了预防岩层失稳等问题的相关建议，主要研究成果如下：

底板岩层的传热性能在高温作用下会发生显著劣化，加热温度是主要的影响因素，加热时间的影响较小，传热性能快速劣化的温度阈值为500 ℃，500 ℃之前传热性能劣化的主要原因是由于岩石内部水分的蒸发逸出导致原有裂纹的发育扩展及新裂纹的生成等原因，导致岩石内部岩土结构的致密性受到了影响，500 ℃之后则主要是由于高岭石、石英等矿物成分的物理化学变化以及晶粒软化等导致热损伤加剧，空洞形成、裂缝贯通和有方向性的加剧扩张等导致孔隙度快速上升，这都会导致传热性能的劣化。

（2）测试了底板岩层在高温后物理参数（质量损失率、波速、视电阻率、抗压强度）的变化规律。其中质量损失率和视电阻率随温度上升逐渐增大，与温度成线性拟合关系，波速（与温度成线性拟合关系）和抗压强度则随温度上升逐渐减小。底板岩层物理性能快速劣化的温度阈值是400 ℃，延长加热时间不会对物理性能的劣化产生太大影响。

（3）高温后底板岩层的孔隙度与温度成正比，超过500 ℃的温度阈值后上升幅度明显增加，中、大孔占比也明显上升，延长加热时间至4 h也会导致中、大孔占比增长。底板岩层中的矿物成分在高温作用下会发生热膨胀、脱水等物理化学反应而导致岩土结构出现严重热损伤。

（4）在富油煤地下隔层式原位热解开采过程中，可根据底板岩层的传热效能变化范围（40%-90%）、强度特征和热损伤情况对加热温度和加热时间进行合理调节，在确保岩层稳定的情况下最大限度提高富油煤资源开采效率。

Based on the characteristics of "Relatively coal-rich, oil-poor and gas-poor" energy distribution in China and the complex international geopolitical background, China is now actively guiding the clean and low-carbon transition development of coal industry. Among them, oil-rich coal has better advantages in improving oil and gas conversion efficiency and reducing economic costs, but the current coal mining methods such as Underground Coal Gasification (UCG), Underground In-situ Pyrolysis (UIP) and other technologies have obvious drawbacks, and it is urgent to develop new and efficient underground in-situ pyrolysis technology for oil-rich coal. At present, a new oil-rich coal Underground Compartmentalized In-situ Pyrolysis (UCIP) technology has been proposed by related scholars. The most important thing in applying UCIP technology to the actual mining project is to ensure the heat transfer efficiency and thermal stability of the baseboard rock layer formation during the heating process. Therefore, it is crucial to clarify the attenuation mechanism of heat transfer performance and thermal damage mechanism of the baseboard rock layer formation to guarantee the mining efficiency. This paper reveals the attenuation mechanism of heat transfer performance and thermal damage mechanism of oil-rich coal baseboard rock layer during in-situ pyrolysis in underground compartmentalized form, evaluates the heat transfer efficiency and thermal stability of the baseboard rock layer, proposes suitable heating temperature interval and heating time range, and gives relevant suggestions to prevent rock layer instability and other problems, the main research results are as follows：

(1) The heat transfer performance of the baseboard rock layer will be significantly deteriorated under the effect of high temperature, the heating temperature is the main influencing factor, the influence of heating time is smaller, the temperature threshold for rapid deterioration of heat transfer performance is 500 ℃, the deterioration of heat transfer performance before 500 ℃ is mainly due to the evaporation of water inside the rock, which leads to the development and expansion of the original cracks and the generation of new cracks, resulting in the denseness of the rock structure inside the rock being affected, while after 500 ℃ it is mainly due to the physical and chemical changes in the mineral composition of kaolinite and quartz and the softening of grains, which leads to the intensification of thermal damage, the formation of cavities, the penetration of cracks and the directional increase in the expansion of porosity. The rapid increase of porosity due to the increase of directional expansion leads to the deterioration of heat transfer performance.

(2) The variation patterns of physical parameters (mass loss rate, wave velocity, apparent resistivity, and compressive strength) of the baseboard rock layer were tested under high temperature conditions. Among them, mass loss rate and apparent resistivity gradually increase with increasing temperature and are linearly fitted with temperature, while wave velocity (linearly fitted with temperature) and compressive strength gradually decrease with increasing temperature. The temperature threshold for rapid deterioration of physical properties of the baseboard rock layer is 400 ℃, and extending the heating time will not have much effect on the deterioration of physical properties.

(3) The porosity of the baseboard rock layer is directly proportional to the temperature under high temperature conditions, and the rise increases significantly after the temperature threshold of 500 ℃, and the proportion of medium and large pores also increases significantly, and extending the heating time to 4 h also leads to the increase of the proportion of medium and large pores. The mineral components in the the baseboard rock layer will undergo thermal expansion, dehydration and other physicochemical reactions under the effect of high temperature and lead to serious thermal damage to the geotechnical structure.

(4) During underground compartmentalized in-situ pyrolysis mining of oil-rich coal, the heating temperature and heating time can be reasonably adjusted according to the variation range of heat transfer efficiency (40%-90%), strength characteristics and thermal damage of the baseboard rock layer, so as to maximize the efficiency of oil-rich coal resources mining while ensuring the stability of the rock layer.