页岩纳米级孔隙结构特征及热成熟演化

发布时间：2018-05-24 00:56

  本文选题：页岩 + 纳米级孔隙　； 参考：《中国石油大学学报(自然科学版)》2017年01期

【摘要】：以中、上扬子地区下古生界海相和中生界陆相页岩为研究对象,运用氩离子抛光-场发射扫描电子显微镜技术和氮气吸附实验测试技术对页岩储层的纳米级孔隙发育特征及热成熟演化进行探讨。结果表明:页岩主要发育了有机质孔、粒间孔、粒内孔和微裂缝等4种孔隙类型;TOC和Ro是控制页岩纳米级孔隙发育的主要因素;对于高演化页岩,不同干酪根类型的有机质孔隙发育程度的大小次序为Ⅰ型Ⅱ型Ⅲ型;石英和黏土矿物通过控制TOC的变化对纳米级孔隙发育和分布产生间接影响;页岩热成熟度演化影响页岩孔径分布和微孔、中孔和大孔相对含量的变化,在高—过成熟阶段,与有机质有关的微孔、中孔呈不断增加的趋势,在极高成熟度阶段,页岩大孔转变为中孔和微孔,有机质孔隙变小,纳米级孔隙体积呈现出先增加后减小的趋势;页岩中干酪根、可溶沥青热裂解生气作用和甲烷化作用可能是页岩有机质纳米级孔隙形成的主要原因。
[Abstract]:The lower Paleozoic marine facies and Mesozoic continental shale in the Middle and Upper Yangtze region were taken as the objects of study. The characteristics of pore development and thermal maturation of shale reservoirs were studied by argon ion polishing field emission scanning electron microscopy and nitrogen adsorption test. The results show that the organic pore, intergranular pore, intragranular pore and microfracture are the main factors controlling the development of shale nanoscale pores, while for highly evolved shale, TOC and Ro are the main factors controlling the development of shale nanoscale pores. The order of pore development of different kerogen types is type 鈪，

本文编号：1927068