Research Progress of Synchronized Testing Method for Permeability Parameters-porosity of Gassy Coal

In order to effectively solve the technical problem of accurate production capacity prediction in the process of CBM development and improve the reliability of gas reservoir resource evaluation results, the research background and value of permeability parameter-porosity test method for gassy coal were introduced. The testing method of permeability parameter-porosity test method for gassy coal under different stress environment and different gas pressure was expounded. The characteristics, application range and the latest progress of different research methods were analyzed, and the research results of pore structure evolution and gas flow mapping rule of coal body were summarized. It is concluded that the research on simultaneous testing method of permeability parameters-porosity for gassy coal involves interdisciplinary research, it is necessary to strengthen the research on characterization of permeability parameters of gassy coal under the influence of multi-physical field coupling, the testing method matching with current conventional coal seam permeability enhancement technology and the improvement of testing accuracy.