黔北地区龙潭组海陆过渡相页岩微观孔隙特征及其储气性
发布时间：2019-03-22 19:46
【摘要】：为了深入研究黔北地区海陆过渡相页岩储层微观孔隙结构特征,选取了二叠系龙潭组钻井岩心页岩样品进行氩离子抛光-场发射扫描电镜实验、氮气吸脱附实验及相关地化和等温吸附等测试,研究页岩微观孔隙类型及孔隙结构特征,并探讨微观孔隙对页岩储气性能的影响。研究结果表明,龙潭组页岩储层的孔隙类型主要包括粒间孔、粒内孔、有机质孔、微裂缝4种,以矿物颗粒粒间孔和黏土矿物粒内孔最为发育,有机质孔发育较少,这主要是因为Ⅲ型干酪根显微组分为结构稳定的镜质组和惰质组在生烃过程中不易产生有机质孔;氮气吸附实验结果显示龙潭组页岩孔隙类型复杂,主要表现为两类:细颈广体的墨水瓶孔隙和四边开口的平行狭缝型孔隙,孔径主要介于3~5 nm,以发育中孔为主,BET比表面积平均为15.846 m~2/g,BJH总孔体积平均为0.012 58 mL/g;龙潭组页岩样品吸附气含量较高(平均为2.37 m~3/t),页岩储层微观孔隙对吸附性能有重要的影响,其中吸附气含量与页岩的孔径呈负相关关系,与页岩的比表面积、孔体积呈较好的正相关关系,页岩的纳米级孔隙为烃类气体的赋存和运移提供了有利条件。
[Abstract]:In order to study the micro-pore structure characteristics of marine-terrestrial transitional shale reservoir in northern Guizhou Province, the Argon ion polishing-field emission scanning electron microscopy (SEM) experiment was carried out on the core shale samples of Longtan formation of Permian system. Nitrogen adsorption and desorption experiments, correlation geochemical and isothermal adsorption tests were carried out to study the micro-pore types and pore structure characteristics of shale, and the influence of micro-pores on the gas storage performance of shale was also discussed. The results show that the pore types of the shale reservoir in Longtan formation mainly include intergranular pore, intra-granular pore, organic pore and micro-fracture. The intergranular pore of mineral and the inner pore of clay mineral are the most developed, but the organic pore is less developed. This is mainly because the macerals of type 鈪，
本文编号：2445863
[Abstract]:In order to study the micro-pore structure characteristics of marine-terrestrial transitional shale reservoir in northern Guizhou Province, the Argon ion polishing-field emission scanning electron microscopy (SEM) experiment was carried out on the core shale samples of Longtan formation of Permian system. Nitrogen adsorption and desorption experiments, correlation geochemical and isothermal adsorption tests were carried out to study the micro-pore types and pore structure characteristics of shale, and the influence of micro-pores on the gas storage performance of shale was also discussed. The results show that the pore types of the shale reservoir in Longtan formation mainly include intergranular pore, intra-granular pore, organic pore and micro-fracture. The intergranular pore of mineral and the inner pore of clay mineral are the most developed, but the organic pore is less developed. This is mainly because the macerals of type 鈪，
本文编号：2445863
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