Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)

Ma Yong; Zhong Ningning; Cheng Lijun; Pan Zhejun; Li Hongying; Xie Qingming; Li Chao

doi:10.11781/sysydz201501109

Volume 37 Issue 1

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Ma Yong, Zhong Ningning, Cheng Lijun, Pan Zhejun, Li Hongying, Xie Qingming, Li Chao. Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(1): 109-116. doi: 10.11781/sysydz201501109

Citation:

Ma Yong, Zhong Ningning, Cheng Lijun, Pan Zhejun, Li Hongying, Xie Qingming, Li Chao. Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(1): 109-116. doi: 10.11781/sysydz201501109

Citation:

Ma Yong, Zhong Ningning, Cheng Lijun, Pan Zhejun, Li Hongying, Xie Qingming, Li Chao. Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(1): 109-116. doi: 10.11781/sysydz201501109

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Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)

doi: 10.11781/sysydz201501109

1.
Key Laboratory of Shale Gas Resource Exploration of Ministry of Land and Resources of the People's Republic of China (Chongqing Institute of Geology & Mineral Resources), Chongqing 400042, China
2. State Key Laboratory of Petroleum Resources & Prospecting, China University of Petroleum, Beijing 102249, China
3. CSIRO Earth Science and Resource Engineering, Melbourne Vic 3169, Australia

Received Date: 2014-09-29
Rev Recd Date: 2014-12-08
Publish Date: 2015-01-28

Abstract

Abstract

We used a Focused Ion Beam Scanning Electron Microscope (FIB-SEM) to observe the pore structures 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-distributed 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 contribution of organic-matter pores in the total porosity is correlated with the total organic carbon (TOC) content. Dissolution pores and interparticle pores are developed in the Niutitang Formation while organic-matter pores are unevenly 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.
- FIB-SEM,
- organic-matter pores,
- three-dimensional reconstruction,
- Niutitang Formation,
- Wufeng-Longmaxi formations,
- southeastern Chongqing area

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References(21)

References

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Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)

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Pore structure of two organic-rich shales in southeastern Chongqing area: Insight from Focused Ion Beam Scanning Electron Microscope (FIB-SEM)

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