油气地质与采收率2017，Vol.24Issue(4)：43-48,54,7.
不同变形程度煤的吸附时间及其影响因素
Adsorption time of coals with different degrees of deformation and their influencing factors
摘要
Abstract
Based on measured data of 103 CBM wells in Changzhi and Anze Block in Southern Qinshui Basin,the adsorption time of coals with different degrees of deformation and its influencing factors were discussed,which can provide guidance for production prediction of coalbed methane well.The pore structures of coals with different degrees of deformation result in great difference in their desorption characteristics.As the degree of coal deformation increases,the adsorption time decreases quickly.In contrast to undeformed coal and weakly deformed coal,the desorption rate of strongly deformed coal is higher,and its amount of desorption increases sharply and the adsorption time become shorter because of well-developed fractures,macropores and mesopores which provide better connectivity and shorter migration path.In the late of desorption,the well-developed small pores and micropores of strongly deformed coal have strong adsorption ability and poorer connectivity,which increases difficulty in methane desorption and migration and therefore the desorption rate reduces markedly.However,the desorption rate of undeformed coal and weakly deformed coal changes slightly and their adsorption time is very long,which is the integrated result influenced by pore and fracture characteristics and geometry shape of coal core.Based on the drainage date of coalbed methane well,it can be drawn that the difference of coal deformation is the major reason for the production change of coalbed methane well.The adsorption time of coal can provide guidance for production prediction of coalbed methane well.关键词
变形程度/解吸特征/吸附时间/日产气量/影响因素/煤层气Key words
degree of deformation/desorption feature/adsorption time/daily gas production/influencing factors/coalbed methane分类
能源科技引用本文复制引用
李朋朋,张小东,杨延辉,丁哲,张硕..不同变形程度煤的吸附时间及其影响因素[J].油气地质与采收率,2017,24(4):43-48,54,7.基金项目
国家自然科学基金项目“煤层气地面开采过程中储层的渗透性动态变化规律及其控制机理”(41372162). （41372162）
