黔西北龙潭组页岩吸附能力主控因素分析

Main controlling factors of shale adsorption capacity of Longtan Formation in Northwest Guizhou

张鹏 黄宇琪 杨军伟 刘洪洋

六盘水师范学院矿业与土木工程学院，贵州 六盘水 553004

School Mining and Civil Engineering, Liupanshui Normal University, Liupanshui 553004, China

通过地球化学、岩石矿物学、孔隙特征和含气性等方面研究发现，黔西北龙潭组页岩有机质具有丰度高、类型为Ⅲ型、热演化程度适中等特点，具有良好的生烃潜力。页岩矿物成分以黏土矿物和石英为主，黏土矿物中伊/蒙混层和伊利石质量分数最高。龙潭组页岩孔隙以中孔为主，现场解析发现含气量高。龙潭组页岩吸附能力主要受有机碳质量分数、有机质成熟度、矿物组成、孔隙结构等内部因素，以及温度、压力、深度等外部因素的共同影响，有机碳质量分数是影响页岩吸附能力最主要的因素。

Through the study of geochemistry, petromineralogy, pore characteristics and gas content, it is found that the shale of Longtan Formation in Northwest Guizhou has the characteristics of high organic matter abundance, type III organic matter, moderate thermal evolution of organic matter, and good hydrocarbon generating potential. The mineral compositions of shale rocks are mainly clay minerals and quartz, and the highest contents of clay minerals are illite/montmorillonite and illite. The pore types are mainly mesopores with high gas content. The adsorption capacity of Longtan Formation shale is mainly influenced by the internal factors such as organic matter abundance, maturity, mineral composition, pore structure, temperature, pressure and depth. Organic carbon content is the most important factor affecting the adsorption capacity of shale.

10.6056/dkyqt201902006