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Petroleum Science >2020,??Issue 4:??1-14 DOI: https://doi.org/10.1007/s12182-020-00462-w

Characteristics of high-rank coal structure parallel and perpendicular to the bedding plane via NMR and X-ray CT Open?Access

文章信息

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作者：Shi-Qi Liu, Shu-Xun Sang, Qiu-Jia Hu & Hui-Huang Fang
作者單位：

Affiliations

Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou, 221008, China

Shi-Qi Liu

Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221008, China

Shi-Qi Liu

School of Mineral Resource and Geoscience, China University of Mining and Technology, Xuzhou, 221116, China

Shu-Xun Sang & Hui-Huang Fang

Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, 221008, China

Shu-Xun Sang & Hui-Huang Fang

Shanxi CBM Branch of Huabei Oilfield Company, China National Petroleum Corporation, Jincheng, 048000, China

Qiu-Jia Hu

Corresponding author

Correspondence to Shu-Xun Sang.


投稿時(shí)間：2019-8-8
引用方式：Liu, S., Sang, S., Hu, Q. et al. Characteristics of high-rank coal structure parallel and perpendicular to the bedding plane via NMR and X-ray CT. Pet. Sci. (2020). https://doi.org/10.1007/s12182-020-00462-w

文章摘要

Pores and fractures and their connectivity play a significant role in coalbed methane production. To investigate the growth characteristics and connectivity of pores and fractures in coal parallel and perpendicular to the bedding plane, the pores and fractures of high-rank coal samples collected from the southern Qinshui Basin were measured by low-field nuclear magnetic resonance, X-ray-computed tomography and field emission scanning electron microscopy. Then, the determinants of their connectivity were further discussed. The results show that the high-rank coal samples have similar pore size distributions both parallel and perpendicular to the bedding plane. They primarily contain mesopores (2–50 nm in width), followed by macrospores (>?50 nm in width). The research indicated that the high-rank coal connectivity parallel to the bedding plane is significantly better than that perpendicular to the bedding plane. The connectivity of high-rank coal is mainly determined by throats, and the orientation of the pores and fractures. The two connectivity modes in high-rank coal are “pore connectivity,” in which the throats are mainly pores with a low coordination number, and “microfissure connectivity”, in which the throats are mainly microfissures with a high coordination number.

關(guān)鍵詞

    Porosity;Connectivity;Pore width;Microfissure;High-rank coal;Qinshui Basin