Impact of Microbially Enhanced Coalbed Methane on the Pore Structure of Coal

Microbially enhanced coalbed methane (MECBM) has important theoretical and practical significance for reforming coal reservoir structure, alleviating greenhouse effects energy crises developing new sources of clean energy. In this study, No. 3 seams in Qinshui Basin were taken as research objects to analyze the pore structure characteristics after microbial treatment by means low-temperature nitrogen adsorption (LTNA), mercury porosimetry (MP), isothermal adsorption/desorption experiments. The results showed that bioconversion, specific surface area volume increased from 1.79 m 2 /g 0.0018 cm 4.01 0.0051 respectively under liquid testing; however, was reduced 5.398 5.246 0.053 0.0626 MP. fractal dimension based on LTNA data indicated micropores minipores 2.73 2.60 2.89 2.81, however meso-macropores decreased 2.90 2.85. volatile matter fixed carbon both 6.68% 78.63%–5.09% 75.63%, Langmuir pressure 34.84 MPa 36.34 3.28 MPa, respectively. This result microorganism participated degradation promoted production gas, more obviously modified microorganism, so diameter stabilized, pores became smoother, decreased, increased. These are beneficial (CBM) treatment.