Test study indicates that , stress sensitivity of low permeability gas reservoirs exists objectively not only for dry rocks , but also rocks with irreducible water , and harm of stress sensitivity to permeability cannot he ignored 实验研究表明，不管是干燥岩石还是含束缚水岩石，低渗透砂岩气藏储层的应力敏感性是客观存在的，而且这种应力敏感性对储层渗透率造成的伤害不可忽视。
It puts forward that the open degree of coal reservoir increases with the enhancement of major stress difference by means of the linkage of maxim major stress difference and coal bed physical quality . when major stress difference is larger than loompa , permeability of coal reservoir is larger than 1 . 0md 通过最大主应力差与煤层物性的耦合，认为煤储层裂隙的张开度随主应力差的增强而加大，主应力差100mpa时，煤储层渗透率1 . 0md 。
Aim at the present condition that the permeability of high rank coal reservoirs and its dynamic change regulation have been rarely studied , based on the modern testing technologies and actual measure data of coalbed methane ( cbm ) well with better drainage effect in qinshui basin , using the international advanced cbm well numerical simulation software ( comet2 ) , the dynamic change regulation of the permeability of high rank coal reservoirs during gas recovery has been discussed , using the gas and water recovery process in divided stage is matched 摘要针对高煤级煤储层渗透率尤其是其动态变化规律极少开展研究的现状，基于现代测试技术和沁水盆地排采效果较好的煤层气井实测排采数据，利用目前国际上较为先进的煤层气数值模拟软件comet2 ，采用分段拟合的方法对煤层气井的产气、产水过程进行历史拟合和修正，进而对高煤级煤储层渗透率在开采中的动态变化规律进行了探讨。
The production is generally very low in low permeability field , and stress - sensitivity makes it worse because the formation stress - sensitivity makes the permeability drop down with the decrease of pore pressure during reservoir producing . meinzer pointed out plastic deformation phenomena in porous media in 1928 , and exponent and nilpotent formulations could characterize the relation between pressure and permeability 针对压力下降引起储层渗透率下降的问题，国内外的专家和学者都进行了大量的研究工作，并将渗透率随压力变化关系归结为单一指数关系或幂函数关系。
