Wu Jingjie, Cao Can, Xiong Bo, Fang Chaohe, Wang Shejiao, Chen Shuya, Mo Shaoyuan, Xin Fudong
School of Energy Resources, China University of Geosciences (Beijing), 29 College Road, Haidian District, Beijing 100083, China.
Ministry of Emergency Management, Training Academy for Executive Leadership, 32 Beiyuan Road, Chaoyang District, Beijing 100012, China.
ACS Omega. 2025 Mar 5;10(10):10685-10693. doi: 10.1021/acsomega.5c00114. eCollection 2025 Mar 18.
Current studies on siltstone permeability at high temperatures are limited to below 800 °C, which cannot direct underground engineering projects with higher temperatures. This study conducts general thermal simulations up to 1400 °C and investigates the permeability and mineral changes of siltstone with temperature. The results show that the permeability and pore structure changes can be divided into 3 stages, and the clay mineral changes lead to stage division. The dehydroxylation leads to increased permeability at Stage II, and recrystallization after liquid phase cooling leads to complex changes in permeability and pore structure at Stage III. The permeability of Mg-containing siltstone after an above 1000 °C treatment has a stronger temperature response due to the high liquid phase content and the formation of cordierite. The suitability of magnesium-containing rocks in underground engineering projects must be considered carefully.
目前关于高温下粉砂岩渗透率的研究仅限于800℃以下，无法指导更高温度的地下工程项目。本研究进行了高达1400℃的通用热模拟，并研究了粉砂岩渗透率和矿物随温度的变化。结果表明，渗透率和孔隙结构变化可分为3个阶段，粘土矿物变化导致阶段划分。脱羟基作用导致第二阶段渗透率增加，液相冷却后的重结晶作用导致第三阶段渗透率和孔隙结构发生复杂变化。由于高液相含量和堇青石的形成，1000℃以上处理后的含镁粉砂岩渗透率具有更强的温度响应。必须仔细考虑含镁岩石在地下工程项目中的适用性。
