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AAPG Bulletin

AAPG Bulletin, Preliminary version published online Ahead of Print 15 September 2022.

DOI:10.1306/08042220004

Multiscale pore characterization of coal measure reservoirs and gas storage and transport behavior in Yanchuannan gas field of China

Shuling Tang1234 , Dazhen Tang123 , Shimin Liu4 , Song Li123 , Jianchao Tang5 , Mingfeng Wang123 , Aobo Zhang123 , and Yifan Pu123

1 School of Energy Resource, China University of Geosciences, Beijing, 100083, China
2 Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing, China
3 Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, China
4 Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, PA, 16802, USA
5 Bureau of Geophysical Prospecting INC., China National Petroleum Corporation, Zhuozhou, 072750, China

Gas co-production is a promising technology for maximum gas production from coal measure formations. A comprehensive reservoir assessment for all the targeted formations, including coal and its adjacent tight sandstone formations, is required for gas co-production planning. This study focused on the pore characterization of coal and tight sandstones in the Yanchuannan gas field in the Ordos Basin in China. Quantitative experiments and a multiscale imaging characterization were employed to probe the pore characteristics. The results indicate that multiscale pores occur both in coal and tight sandstones; coal has a bimodal pore size distribution, and sandstone is evenly distributed. For micrometer-scale pores, the tight sandstone is dominated by intergranular pores (5–80 μm) and intracrystalline pores (2–5 μm). For nano-scale to submicrometer-scale pores, the sandstone consists of primary (4 molecules are mainly adsorbed within 2 nm from pore walls. The gas storage mode and required diameter in coal should be between two extreme modes with and without considering H2O proposed in this paper. For the tight sandstone, the pore-throat lower limit of gas storage is about 12–15 nm. Moreover, gas transport behavior in coal measure reservoirs has a spatial scale and a time scale.

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