Journal
INTERNATIONAL JOURNAL OF COAL GEOLOGY
Volume 158, Issue -, Pages 13-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.coal.2016.03.001
Keywords
FE-SEM; Pore type; Pore size distribution; Sinian-Cambrian shale; Mesopore
Categories
Funding
- National Oil and Gas Strategic Investigation Program [2009GYXQ-15, 2012GYYQ-01]
- National Natural Science Foundation of China research [41102088, 41272167]
- open research program of Tectonics and Petroleum Resources Key Laboratory, Ministry of Education of the People's Republic of China [TPR-2012-11]
Ask authors/readers for more resources
To clarify the size distribution of different types of shale pores, nine Sinian-Cambrian shale samples from South China were examined using ion-milling, FE-SEM, nitrogen adsorption and mercury intrusion. Image-based point counting data indicated that nanopores are predominant, whereas pores larger than 1 pm are absent. Organic matter-hosted pores dominate below 130 nm, whereas intraparticle pores within carbonate, probably caused by dissolution, constitute most pores larger than 400 nm. The small amount of residual intraparticle and interparticle pores associated with rigid minerals mostly range from 50 nm to 250 nm. A positive relationship was found between the TOC and total pore volume measured by nitrogen and mercury. The mercury volume of pores larger than-300 nm increased with increasing dolomite and decreasing clay mineral content. The statistics from image-analysis and the relationship between pore volume and shale components were in good agreement, indicating that different types of pores have their own relative restricted size range. Generally, intraP pores are larger than pores associated with rigid minerals, whereas the OM pores and interP pores associated with OM or clay are the smallest. Through a comparison with other less matured shale formations, the highly matured (equivalent vitrinite reflectance above 3%) Sinian-Cambrian shale in South China was characterized in this study as those with smaller interP pores, which is probably due to a stronger compacting effect. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available