摘要
选择了成熟度、有机质类型与矿物组成较为接近但有机碳含量(TOC)有明显差异的两个成熟页岩进行了氮气、二氧化碳气体等温吸附分析,并考察了抽提前/后吸附特征的变化,尝试说明影响成熟页岩孔隙发育的主要因素。初步的结果表明,页岩的比表面积主要取决于微孔的发育程度,而孔体积则与大孔的发育程度关系密切;微孔发育程度与页岩的有机碳含量有密切的关系;页岩抽提后对两种气体的吸附量相对于抽提前均显著增加,抽提前/后样品在60°C及110°C干燥等不同前处理方式下获得的氮气等温吸附数据表明,残留沥青对孔隙发育具有明显的制约作用。
Two mature shale samples, which show similar organic matter type, mineralogy and maturation level but different total organic carbon content （TOC）, have been investigated using the adsorption of nitrogen and carbon dioxide to determine main factors that could influence pore structures of shales. Moreover, the comparison of gas adsorption was performed between extracted sample and un-extracted sample. Preliminary results suggest that micropores contribute more to the total specific surface area than mesopores, whereas macropores have a close relationship with the pore volume. Specific surface area of micropores shows a good correlation with TOC values of gas shales. The gas adsorption capacity of extracted samples is much larger than that of un-extracted samples. Nitrogen isothermal adsorption data of shale samples obtained by various pretreatment methods, such as drying of extracted and un-extracted samples at 60℃ and 110℃, respectively, show that residual bitumens in shales have significant restrictions for the development of pores.
出处
《地球化学》
CAS
CSCD
2014年第4期408-414,共7页
Geochimica
基金
国家重点基础研究发展计划(2012CB214704)
中国科学院广州地球化学研究所"一三五"项目
有机地球化学国家重点实验室项目
关键词
抽提
成熟页岩
气体吸附
沥青
孔隙
extraction
mature shale
gas adsorption
bitumen
pores
作者简介
郭慧娟（1987-），女，硕士研究生，油气地球化学专业。E—mail：786445674@qq．com。
通讯作者（Corresponding author）：JIA Wang-lu，E-mail：wljia@gig．ac．cn，Tel：＋86-20-85291312
