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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/07061514240
Characterization of the micropore systems in high-rank coal reservoirs of the southern Sichuan Basin, China
Changan Shan,1 Tingshan Zhang,2 Junjie Guo,3 Zhao Zhang,4 and Yang Yang5
1State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China; [email protected]
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China; [email protected]
3School of Safety Engineering, Henan Institute of Engineering, Zhengzhou 451191, China; [email protected]
4Exploration and Development Department, Zhejiang Oilfield Company, CNPC, Hangzhou 310023, China; [email protected]
5School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China; [email protected]
ABSTRACT
To gain a better understanding of the characteristics of micropore systems in high-rank coal reservoirs, 51 coal core samples collected from 16 wells were examined by maceral analysis, proximate analysis, scanning electron microscopy observation, low-temperature nitrogen gas adsorption, and nuclear magnetic resonance (NMR). The results show that pores in coals can be divided into plant tissue hole, blowhole, dissolved pore, and intercrystalline pore, and they have three structure shapes: open pore, semiclosed pore, and “ink bottle” pore. The total specific surface area (Brunauer-Emmet-Teller [BET]) ranges from 0.611 to (7 to ), averaged at . The total pore volume (Barrett-Joyner-Halenda model [BJH]) ranges from 0.0018 to (0.0001 to ) with an average of , and it shows a good positive relationship with . The adsorption amount shows a good positive relationship with the total and . The average pore size ranges from 5.775 to 17.842 nm. Pores that are smaller than 5 nm make up the main contribution to the pore surface area, and those larger than 10 nm contribute greatly to the pore volume. Inertinite-rich coals have higher total specific surface area, pore volume, pore size, and adsorption capacity than those in vitrinite-rich coals. Lopingian coal reservoirs are characterized by low porosity and extremely low permeability obtained from NMR tests, and the permeability has a positive correlation with the porosity. The average permeability of inertinite is almost twice that of vitrinite .
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