岩性油气藏 ›› 2019, Vol. 31 ›› Issue (5): 5260.doi: 10.12108/yxyqc.20190506
陈相霖1,2, 郭天旭1,2, 石砥石1,2, 侯啓东3, 王超1,2
CHEN Xianglin1,2, GUO Tianxu1,2, SHI Dishi1,2, HOU Qidong3, WANG Chao1,2
摘要: 为揭示陕南地区下寒武统牛蹄塘组页岩孔隙结构特征及其吸附能力,采用场发射扫描电镜观察、有机地球化学分析、全岩X射线衍射、氮气吸附和等温吸附实验等方法,通过定性观察和定量表征相结合的方式,来研究该组页岩的孔隙结构类型,并探讨页岩孔隙结构和吸附能力的主控因素。结果表明:陕南地区牛蹄塘组页岩主要发育有机质孔、粒内孔、粒间孔和微裂缝等4种孔隙类型,页岩孔径为1.8~316.7 nm,BET比表面积为1.34~13.20 m2/g,平均值为6.83 m2/g,BJH吸附总孔体积为0.003~0.011 cm3/g,平均值为0.006 cm3/g;影响页岩孔隙发育的直接因素包括总有机碳含量和热演化成熟度,二者与孔隙体积和比表面积均呈正相关性;影响页岩孔隙发育的间接因素包括汉南古隆起周缘的构造运动和沉积环境,二者对牛蹄塘组页岩热演化成熟度、埋藏深度、厚度和岩性变化均具有较大影响,从而间接控制着页岩孔隙结构的发育特征;页岩吸附能力主要受有机碳含量、孔隙体积和比表面积等因素的影响,三者与甲烷吸附气量均呈正相关性。该研究结果对陕南地区寒武系页岩气资源潜力评价及选区评价均具有重要意义。
中图分类号:
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