煤储层渗透性研究方法及主要影响因素

Research method and main influencing factors of coal reservoir permeability

煤储层渗透性是制约煤层气勘探选区的重要参数,掌握其研究方法及影响因素,对于有效预测煤储层渗透率、发展渗透性描述理论及寻找有利勘探区带具有重要意义。综述了中外煤储层渗透性研究的进展和主要研究方法,并从裂隙系统、有机显微组分和煤岩类型、煤的变质程度、有效应力和埋藏深度、构造应力场等方面对煤储层渗透性的影响进行了分析。在煤储层渗透率的研究中应结合中国煤盆地的地质背景,综合分析各因素,统一测定仪器、统一操作规范和标准,从而获取有效参数,应用先进的评价方法,才能更准确地预测煤储层的渗透率。

Permeability of coal reservoir is one of the most important parameters controlling the exploration targets.It is significant on predicting the coal reservoir permeability effectively,developing permeability description theory and searching favorable prospecting area to find out the research method and influencing factors.Advancement and main techniques on coal reservoir permeability were summarized,and the effects of fracture system,organic maceral,lithotype,metamorphic grade of the coal,effective stress,buried depth,tectonic stress field etc.on coal reservoir permeability were analyzed.According to the geological background of coal basins,all factors should be analyzed comprehensively with unified measuring devices,operating codes and standards in the research of coal reservoir permeability to obtain valid parameters.And advanced evaluation methods could predict the coal reservoir permeability more accurately.