School of Energy Resources, China University of Geosciences (Beiing) Coal Reservoir Laboratory of National
Engineering Research Center of Coalbed Methane Development & Uillization

为研究不同变质程度煤吸附能力的主控因素,通过显微组分分析、压汞试验、液氮试验以及等温吸附试验,分析了不同煤阶煤吸附能力差异。结果表明,研究区中煤的镜质组反射率R_o=0.44%~3.20%,兰氏体积为9.11~30.24 m~3/t,且随煤阶的增高逐渐增大;孔隙度、BET比表面积、微孔体积随煤阶的增高呈现高-低-高的变化规律,在R_o=1.9%左右时达到最小值,其影响着煤储层的吸附空间,但并不能主导煤储层吸附能力的变化;孔隙形态方面,墨水瓶孔对储层吸附能力控制较强;显微组分方面,镜质组含量在中低煤变质阶段对煤储层吸附能力起一定控制作用,在高变质阶段,惰质组中丝质体对储层吸附能力的控制更强。

In order to study the main controlling factors of coal adsorption capacity with different metamorphism, through microscopic component analysis, mercury intrusion test, liquid nitrogen adsorption experiment and methane isothermal adsorption experiments, the relationship between coal rank and adsorption capacity were d iscussed. The results showed that Rowas 0.44% ~ 3.20%, Langmuir volume was 9.11 ~30.24 m3/t, and Rovalue increased with the coal rank increasing in the study are a; the porosity values, the BET specific surface area, the micropore volume of coal samples presented a trend of high-low-high variation along with the rising of coal ran K, and attained the minimal value when Ro= 2.3%, the pore structure affected the adsorption space of the coal reservoir, but it could not lead to the change of the adsor ption capacity of the coal reservoir. The pore shape especially the ink bottle pore is stronger than others. The vitrinite content plays a certain role in the adsorption capa city of the coal reservoirs during the low coal metamorphic grade, in the high metamorphic grade, and the fusinite's control is stronger.

国家自然科学基金资助项目(41272175)；国家自然科学基金青年基金资助项目(41502157)；