石油实验地质Issue(1)：109-116,8.DOI:10.11781/sysydz201501109
渝东南两套富有机质页岩的孔隙结构特征--来自FIB－SEM的新启示
Pore structure of two organic-rich shales in southeastern Chongqing area:Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)
摘要
Abstract
We used a Focused Ion Beam Scanning Electron Microscope ( FIB-SEM) to observe the pore struc⁃tures of the Lower Cambrian Niutitang shale and the Upper Ordovician Wufeng to Lower Silurian Longmaxi shale, sampled in the southeast of Chongqing. Three⁃dimensional distributions of the nanometer⁃sized organic⁃matter pores were reconstructed and their pore structure parameters were analyzed quantitatively. Our work indicated that microfractures between strata, interparticle and intraparticle pores in the mineral matrix, and organic⁃matter pores were well⁃developed in the Wufeng-Longmaxi formations. Pores within organic matter form a well⁃distribu⁃ted honeycomb like structure with good connectivity, and the pore radius is between 3 and 100 nm. Porosity of organic matter calculated using the FIB-SEM 3⁃D reconstruction is between 9.13% and 18.42%,and the contri⁃bution of organic⁃matter pores in the total porosity is correlated with the total organic carbon ( TOC) content. Dis⁃solution pores and interparticle pores are developed in the Niutitang Formation while organic⁃matter pores are un⁃evenly distributed. The organic⁃matter pores are tabular or pinhole with the pore radius between 3 and 25 nm and have poor connectivity. The calculated organic⁃matter porosity is below 1.59% and has little relationship with the TOC content. So the total porosity in the Niutitang shale mainly comes from the mineral matrix pores. The FIB-SEM results have shown significant differences in the pore structure of the two shales.关键词
聚焦离子束扫描电镜/有机质孔隙/三维重构/牛蹄塘组/五峰组-龙马溪组/渝东南地区Key words
FIB-SEM/organic-matter pores/three-dimensional reconstruction/Niutitang Formation/Wufeng-Longmaxi formations/southeastern Chongqing area分类
能源科技引用本文复制引用
马勇,钟宁宁,程礼军,潘哲君,李红英,谢庆明,李超..渝东南两套富有机质页岩的孔隙结构特征--来自FIB－SEM的新启示[J].石油实验地质,2015,(1):109-116,8.基金项目
重庆市国土资源和房屋管理局科技计划项目（ CQGT－KJ－2012－1）。 （）
