收稿日期: 2014-06-03
修回日期: 2014-09-10
网络出版日期: 2015-03-10
基金资助
国家自然科学基金“鄂尔多斯盆地三叠系陆相页岩微孔隙特征与天然气赋存方式研究”(编号：41272144)；中国科学院2012年“西部之光”项目“甘肃陇东地区三叠系湖相页岩气的赋存条件研究”；中国科学院战略性先导科技专项(B类)—页岩气勘探开发基础理论与关键技术(编号：XDB10010300)；甘肃省科技计划(编号：1309RTSA041)联合资助.
Micropore Characteristics of the Organic-rich Shale in the 7th Member of the Yanchang Formation in the Southeast of Ordos Basin
Received date: 2014-06-03
Revised date: 2014-09-10
Online published: 2015-03-10
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。
杨巍，陈国俊，吕成福，仲佳爱，徐勇，杨爽，薛莲花 . 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[J]. 天然气地球科学, 2015 , 26(3) : 418 -426 . DOI: 10.11764/j.issn.1672-1926.2015.03.0418
Micro-porosity structure and morphology of organic-rich shale in the 7th Member of the Yanchang Formation in Ordos Basin was investigated using low pressure N2 adsorption analysis,field emission scanning electron microscope observations,and combined with effective porosity and Pulse-Decay permeability.The results show that the pores in the black shale are generally in nano-scale except some interparticle pores in micrometer-scale developed between clay minerals.Pores can be classified into interparticle pores,intergranular pores in pyrite framboids,dissolved intragranular pores,organic pores,and micro-fractures.The interparticle pores in clay minerals are the best in pores,and the organic pores are relative less.The pore size are complex with abundant mesopores (2-50nm),macropores (>50nm) and a small number of micropores (0-2nm).Samples with the highest pore volumes contain a plenty of mecropores and macropores,and samples with the highest special surface area have high quality micropores and finer mecropores (2-10nm).The permeability in samples has no relative with other parameter for it is related to the degree of fracture development,pore structure,etc.
Key words： Shale; Porosity feature; Nitrogen adsorption; FE-SEM; Ordos Basin
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