Study on the Effect of Salinity and Water Content on CBM Adsorption/Desorption Characteristics of Coal Reservoir in Baode Block

The adsorption/desorption characteristics of a coal reservoir play an important role in coalbed methane (CBM) development. proximate analysis, maceral analysis and isothermal experiment are carried out based on samples from no. 4+5 seam Baode block. Combing with experimental data the CBM well-produced water salinity block, effect content its influencing mechanism is discussed. results show that adsorption desorption capacity decreases increase decrease value shows decreasing trend. reduces solubility then methane. With content, capacities gradually. samples. change rapidly low-water stage slowly high-water stage. competitive blocking between molecules main mechanisms adsorption/desorption. It can be seen will have certain adverse impact influence difference cannot ignored reserve evaluation productivity prediction CBM. continuous, stable, effective drainage one key factors to ensure efficient development wells