- 责任者：Li Junqian (Coal Reservoir Laboratory ; National Engineering Research Center of CBM Development of Utilization ; School of Energy Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Liu Dameng
- 刊名：Natural Gas Geoscience
- 出版年：2013
- 卷期：24(5)
- 关键词：煤储层 ; coal reservoirs
- 页码：p.1074-1078
- 图表：3 illus., 1 table, 18 refs.
- 分类号：1003
- issnNo：ISSN1672-1926
- isbnNo：CN62-1177/TE
Dynamic coal reservoir permeability impacts the production of coalbed methane （CBM）and has been extensively studied. Gas （Helium）permeability change was measured under a 4.3MPa con~fining stress condition for 6 anthracite coal cores from the southern Qinshui Basin. Furthermore, controlling factors of the permeability change were investigated by comprehensively analyzing the effects of gas slippage and ef- fective stress on the permeability. Results show that during gas pressure decline：@the permeability initial- ly decreases but subsequently increases,during which the rebound begins at an inlet gas pressure of about 1.9MPa（corresponding to a mean gas pressure of 1.0MPa） ;（2）gas slippage phenomenon appears as the mean gas pressure falls bellow 1.0MPa;@the permeability is approximately negatively related to effective stress ; @the permeability decreases due to the negative effect from effective stress as the inlet gas pressure is greater than 1.9MPa;while it increases when the pressure falls below 1.9MPa because the positive effect from gas slippage is stronger than the negative effect from effective stress.