| Pore Structure and Permeability Characterization of Highrank Coal Reservoirs: A Case of the Bide-Santang Basin,Western Guizhou,South China |
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| 作者姓名： | GUO Chen QIN Yong MA Dongmin XIA Yucheng BAO Yuan CHEN Yue LU Lingling |
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| 作者单位： | 1 College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
2 Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi''an 710054, China
3 Post-doctoral Research Station of Geological Resources and Geological Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
4 Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China;5 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China |
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| 基金项目： | a National Science and Technology Major Special Project of China(Grant No.2016ZX05044);a Postdoctoral Science Foundation of China(Grant No.2018M631181);a Natural Science Foundation of Shaanxi Province of China(Grant No.2019JQ-192);a Special Scientific Research Project of Natural Science of Education Department of Shaanxi Province(Grant No.2020-016);a Foundation Research Project of Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation(Grant No.MTy2019-08);the Independent Projects of the Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Land and Resources of China(Grant No.ZKF2018-1,ZP2018-2). |
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| 摘 要： | The methods of nuclear magnetic resonance(NMR)spectroscopy,mercury injection porosimetry(MIP),and gas-water relative permeability(GWRP)were used to reveal the pore structure and permeability characteristics of high-rank coal reservoirs in the Bide-Santang basin,western Guizhou,South China,to provide guidance for coalbed methane(CBM)exploration and exploitation and obtain direct insights for the development of CBM wells.The results indicate that the coal reservoirs in the study area are characterized by well-developed adsorption pores and poorly developed seepage pores.The bimodal NMR transverse relaxation time(T2)spectra and the mutation in the fractal characteristic of the MIP pore volume indicate poor connectivity between the adsorption pores and the seepage pores.As a result,the effective porosity is relatively low,with an average of 1.70%.The irreducible water saturation of the coal reservoir is relatively high,with an average of 66%,leading to a low gas relative permeability under irreducible water saturation.This is the main reason for the low recovery of high-rank CBM reservoirs,and effective enhanced CBM recovery technology urgently is needed.As a nondestructive and less time-consuming technique,the NMR is a promising method to quantitatively characterize the pores and fractures of coals.
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| 关 键 词： | coalbed METHANE reservoir CHARACTERIZATION PORE structure relative PERMEABILITY nuclear magnetic resonance |
| 收稿时间： | 2018/7/13 0:00:00 |
| 修稿时间： | 2019/4/7 0:00:00 |
Pore Structure and Permeability Characterization of High‐rank Coal Reservoirs: A Case of the Bide‐Santang Basin,Western Guizhou,South China |
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| Authors: | GUO Chen QIN Yong MA Dongmin XIA Yucheng BAO Yuan CHEN Yue LU Lingling |
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| Abstract: | The methods of nuclear magnetic resonance (NMR) spectroscopy, mercury injection porosimetry (MIP), and gas-water relative permeability (GWRP) were used to reveal the pore structure and permeability characteristics of high-rank coal reservoirs in the Bide-Santang basin, western Guizhou, South China, to provide guidance for coalbed methane (CBM) exploration and exploitation and obtain direct insights for the development of CBM wells. The results indicate that the coal reservoirs in the study area are characterized by well-developed adsorption pores and poorly developed seepage pores. The bimodal NMR transverse relaxation time (T2) spectra and the mutation in the fractal characteristic of the MIP pore volume indicate poor connectivity between the adsorption pores and the seepage pores. As a result, the effective porosity is relatively low, with an average of 1.70%. The irreducible water saturation of the coal reservoir is relatively high, with an average of 66%, leading to a low gas relative permeability under irreducible water saturation. This is the main reason for the low recovery of high-rank CBM reservoirs, and effective enhanced CBM recovery technology urgently is needed. As a nondestructive and less time-consuming technique, the NMR is a promising method to quantitatively characterize the pores and fractures of coals. |
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| Keywords: | coalbed methane reservoir characterization pore structure relative permeability nuclear magnetic resonance |
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