李卫波,李菲,史利燕,等.低阶煤不同宏观煤岩组分孔隙发育特征及甲烷吸附/解吸性能差异[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2021110078.

LI W B,LI F,SHI L Y,et al.Differences of the pore characteristics and adsorption/desorption of coalbed methane of different coal macrolithotype in low-rank coal reservoirs[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2021110078

低阶煤不同宏观煤岩组分孔隙发育特征及甲烷吸附/解吸性能差异(网络首发)

李卫波1,李菲1,史利燕1,周少伟1,马东民2,王传涛3,陈跃2

1. 陕西省地质科技中心，陕西 西安710054；2. 西安科技大学 地质与环境学院，陕西 西安710054；3. 延安大学 化学与化工学院，陕西 延安716000

摘要:针对煤储层非均质性较强，不同宏观煤岩组分由于物质成分和孔隙结构差异导致煤层气 吸附解吸性能和气水运移特征迥异的问题，以黄陇煤田彬长矿区延安组低阶煤为研究对象，采 集并分离镜煤和暗煤组分，综合运用显微组分测定、元素分析、压汞、低温液氮吸附、吸附解吸 试验等多种测试方法，研究低煤阶镜煤和暗煤的孔隙发育特征差异和对甲烷吸附/解吸性能的 影响。结果表明：（1）镜煤的镜质组质量分数、挥发分及H，O，N，S元素质量分数高于暗煤的， 而惰质组、壳质组、矿物、灰分、固定碳及C元素质量分数低于暗煤的；（2）煤样孔隙度为 2.92%~10.29%，总体孔隙较发育，暗煤孔隙度略高于镜煤，孔喉更粗，大孔更发育，连通性更 好。镜煤BET比表面积和BJH总孔容均略大于暗煤的，微孔更发育，且多以半封闭型和墨水瓶 型孔隙为主；（3）镜煤微小孔更发育，比表面积更大，吸附能力更强。煤中甲烷吸附/解吸过程 普遍存在解吸滞后现象，暗煤孔隙连通性相对较好，解吸滞后程度低于镜煤，理论解吸效率高 于镜煤。研究结果可为彬长矿区低阶煤煤层气储层物性认识提供参考。

关键词:黄陇煤田;低煤阶;煤岩组分;孔隙结构;吸附解吸

中图分类号：P618.13

doi:10.16186/j.cnki.1673-9787.2021110078

基金项目:国家自然科学基金资助项目（41902175）；陕西省地勘基金公益性项目（2019JQ-245）

收稿日期:2021-11-19

修回日期:2021-12-14 

网络首发日期:2022-09-13

Differences of the pore characteristics and adsorption/desorption of coalbed methane of different coal macrolithotype in low-rank coal reservoirs(Online)

LI Weibo1，LI Fei1，SHI Liyan1，ZHOU Shaowei1，MA Dongmin2，WANG Chuantao3，CHEN Yue2

（1. Shaanxi Geological Science and Technology Center，Xi’an 710054，Shaanxi，China；2. College of Geology and Environment，Xi’an Universityof Science and Technology，Xi’an 710054，Shaanxi，China；3. School of Chemistry and Chemical Engineering，Yan’an University，Yan’an 716000，Shaanxi，China）

Abstract:Coal reservoirs are highly heterogeneous and different macrolithotypes of coal have differences in material composition and pore structure, resulting in different coalbed methane(CBM) adsorption/desorption performance and gas-water migration characteristics. The differences of pore development characteristics between vitrain and durain and its influence on adsorption and desorption were studied based on theelement analysis, mercury injection, low temperature liquid nitrogen adsorption,adsorption-desorption experiment of the coal samples of Yan’an Formation in Huanglong coalfield. The results show: (1) The contents of vitrinite, volatile matter and H, O, N and S elements of vitrain are higher than those of durain, while the contents of inertinite, chitinite, minerals, ash, fixed carbon and C elements are lower than those of durain. (2) The coal sample has a porosity of 2.92%-10.29%, and overall, the pores are relatively developed. The porosity of durain is slightly higher than that of vitrain. The pore throat of durain is thicker and the macropores pores are more developed, resulting in better connectivity. The BET specific surface area and BJH total pore volume of vitrain coal are slightly larger than durain, and the micropores are more developed, which are dominated by semi-closed and ink bottle shaped pores. (3) Compared with durain,vitrain has more micropores and mesopores, contributing more specific surface area and stronger adsorption capacity. Desorption hysteresis is common in the process of methane adsorption / desorption in coal, and the pore connectivity of durain is relatively better, resulting in the degree of desorption hysteresis weaker and the theoretical desorption efficiency higher than that of vitrain .

Key words:Huanglong coal field;low coal-rank;coal lithotype;pore structure;adsorption/desorption

CLC：P618.13