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高煤级煤基质力学效应与煤储层渗透率耦合关系分析

傅雪海, 秦勇, 张万红   

  1. 中国矿业大学资源与地球科学学院,徐州 221008
  • 收稿日期:2003-09-20 修回日期:2003-09-20 出版日期:2003-09-20 发布日期:2003-09-20

Coupling Correlation Between High-rank Coal Matrix Mechanic Effect and Coal Reservoir Permeability

FU Xue-hai, QIN Yong, ZHANG Wan-hong   

  1. College of Mineral Resource and Geosciences, China University of Mining and Technology, Xuzhou 221008, China
  • Received:2003-09-20 Revised:2003-09-20 Online:2003-09-20 Published:2003-09-20

摘要: 基于吸附膨胀物理模拟实验,揭示了瘦煤至无烟煤阶段煤基质的自调节特征,分别探讨了煤层气排采过程煤基质收缩和有效应力变化对煤储层渗透率的影响,构建了有效应力、煤基质收缩与煤储层渗透率之间耦合的数学模型,揭示出高煤级煤储层渗透率在煤层气排采过程中的递减变化规律,并讨论了这一发现的地质意义。

Abstract: Based on the adsorbing-swelling experiments of coal samples,the self-adjusting effects of lean coal to antracite were revealed.Then,the influence of the effects on coal reservoir permeability was analysed and the coupling mathematical model between the effective-stress effect,coal matrix shrinkage effect an dpermeability was established .The degressive rule of high-rank coal reservoir permeability during the coalbed methane recovery and the geological significance of the discovery were discussed.