摘要
孔隙结构是油页岩的一个重要特征,直接影响油页岩内的传热效率与油气流动行为。为分析油页岩孔隙结构在热解过程中的演化规律,采用热重分析与低温氮气吸附(LTNA)手段,定量分析了压力及不同热解终温下油页岩孔隙结构特征。结果表明:抚顺油页岩的有机质降解阶段为350~540℃,干酪根分解与沥青的二次分解在同一温度区间完成,没有明显的两阶段过程。以有机质热解起始温度350℃为界,孔隙结构与类型发生重大改变。低于该温度时以墨水瓶型孔为主,高于该温度时以狭缝型孔为主,有机质热解对油页岩孔隙类型的变化起控制作用。油页岩孔隙结构演化涉及复杂的物化过程,是有机质、热解产物与无机矿物共同作用的结果,有机质的热解使比表面积与孔体积产生大幅增加,研究结果可作为油页岩原位开采的有益参考。
Pore structure is an important characteristic of oil shale,which directly affects the heat transfer efficiency and the flow behavior of products in the oil shale.In order to analyze the evolution of pore structure of oil shale during pyrolysis,thermogravimetry and low-temperature nitrogen adsorption(LTNA)method were adopted to quantitatively analyze the pore structure characteristics of oil shale at pressure and different pyrolysis temperatures.The results show that:The stage of organic matter decomposition of oil shale in Fushun is 350~540℃,including decomposition of kerogen and secondary decomposition of bitumen.There is no obvious temperature difference between them.With the 350℃of starting temperature of organic matter pyrolysis as a boundary,the pore structure and type undergo significant changes.Ink bottle-type pores dominated when T<350℃and slit-type pores dominated when T>350℃,the pyrolysis of organic matter plays a controlling role in the change of pore types.The evolution of pore structure of oil shale involves complicated process of physicochemical,which is the result of organic matter,pyrolysis products and inorganic minerals.The pyrolysis of organic matter greatly increases the specific surface area and pore volume,the results can be used as a useful reference for the in-situ exploitation of oil shale.
作者
刘志军
杨栋
胡耀青
邵继喜
LIU Zhi-jun;YANG Dong;HU Yao-qing;SHAO Ji-xi(Mining Technology Institute,Taiyuan University of Technology,Taiyuan 030024,China;Heilongjiang Ground Pressure and Gas Control in Deep Mining Key Laboratory, Heilongjiang University of Science and Technology,Harbin 150022,China)
出处
《西安科技大学学报》
CAS
北大核心
2018年第5期737-742,共6页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金(51574173
51574115
51774121)
关键词
矿业工程
油页岩
原位热解
孔径分布
低温氮吸附
mining engineering
oil shale
in-situ pyrolysis
pore size distribution
low-temperature nitrogen adsorption
