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AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/08042220004
Multiscale pore characterization of coal measure reservoirs and gas storage and transport behavior in Yanchuannan gas field of China
Shuling Tang,1 Dazhen Tang,2 Shimin Liu,3 Song Li,4 Jianchao Tang,5 Mingfeng Wang,6 Aobo Zhang,7 and Yifan Pu8
1School of Energy Resource, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane (CBM) Development and Utilization, China University of Geosciences, Beijing, China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing, China; [email protected]
2School of Energy Resource, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, China University of Geosciences, Beijing, China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing, China; [email protected]
3Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, Pennsylvania; [email protected]
4School of Energy Resource, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, China University of Geosciences, Beijing, China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing, China; [email protected]
5Bureau of Geophysical Prospecting Inc., China National Petroleum Corporation, Zhuozhou, China; [email protected]
6School of Energy Resources, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, China University of Geosciences, Beijing, China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing, China; [email protected]
7School of Energy Resource, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, China University of Geosciences, Beijing, China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing, China; [email protected]
8School of Energy Resource, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, China University of Geosciences, Beijing, China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing, China; [email protected]
ABSTRACT
Gas coproduction 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 coproduction 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 nanoscale 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 as proposed in this paper. For the tight sandstone, the pore-throat lower limit of gas storage is approximately 12–15 nm. Moreover, gas transport behavior in coal measure reservoirs has a spatial scale and a time scale.
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