不同变质变形煤特征对煤层气富集渗流的制约

煤岩是煤层气的主要储集层，其变质变形作用对煤层气的赋存、运移和开发都具有重要意义。本文以华北地区典型含煤区为研究区，基于现场资料分析、煤岩显微观测，孔渗测试及压汞实验分析，探讨了不同变质变形煤储层孔渗特征，并从裂隙、孔隙不同尺度探讨了不同变质变形煤储层特征及其孔、裂隙结构特征对煤层气富集渗流所起的作用。结果表明，首先，煤层气产出过程与煤储层变质变形特征密切相关；实验室测定的渗透率与试井渗透率具有可比性，一般碎斑煤大于碎裂煤；高变质弱变形煤储层和中变质弱变形煤储层煤层气的富气能力与渗流能力比较强，是煤层气富集高渗的有利储层。

Characterization of different metamorphic-deformed coals and its restriction on coalbed methane accumulation and flow

Coal is the reservoir for coalbed methane, its metamorphism and deformation are closely related to coalbed methane occurrence, migration and development. Based on the field data analysis, microscopic observation, porosity-permeability testing and mercury porosimeter analysis, we disscuss the property characteristics of different metamorphic and deformed coals from typical coal-bearing coalfields, explore the coal reservoir features and the effects of fracture-pores on coalbed methane accumulation and flow. Results indicate that the production of coalbed methane is bond up with metamorphism and deformation of coal reservoirs. Furthermore, permeability value from laboratory testing is consistent with that from logging. Thirdly, high metamorphic and weak deformed coal and medium metamorphic and weak defromed coal are advantageous for coalbed methane accumulation and flow.