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OALib Journal期刊
ISSN: 2333-9721
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鄂尔多斯盆地东南部延长组长7段富有机质页岩孔隙特征
Keywords: 页岩,孔隙特征,低温氮气吸附,扫描电镜,鄂尔多斯盆地
Abstract:
？为研究鄂尔多斯盆地长7段陆相富有机质页岩孔隙发育特征，采用覆压孔隙度测量、脉冲衰减渗透率测量、低温氮气吸附实验等结合氩离子抛光—扫描电镜成像分析，对页岩孔隙发育特征进行深入研究。结果表明，页岩储层孔隙主要为纳米量级，少量黏土矿物粒间孔可达微米级别；孔隙类型主要有粒间孔、黄铁矿微球粒晶间孔、粒内孔、有机孔及少量微裂缝，其中黏土矿物粒间孔最发育，有机孔相对较少；页岩孔径分布复杂，含有大量的中孔(2~50nm)、大孔(>50nm)及少量的微孔(0~2nm)，中孔和大孔是孔隙体积的主要贡献者，微孔和细中孔(2~10nm)是比表面积的主要贡献者；样品渗透率变化幅度大，与页岩中裂缝的发育程度及孔隙结构有关。
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