Abstract: With the improvement of oil and gas exploration technology, a volcanic gas reservoirwith good developmentpotential has been found for the first time in deep zone of Songliao Basin,North-East of China. The pay zone is characteristic of various rocks, complex lithologies, sharp lateral variations of lithologies and lithofacies, developed microcrack, poor physical property,
serious anisotropy and stress sensitivity. In this paper, according to the geological complexity in the volcanic gas reservoir, its deformation character and the effect on the permeability and productivitywere researched through laboratory experiments. On the base of experiment results, considering the rock-crack deformation, a numerical simulationmodel of the double rositymedia gas reservoirwas established, and the recovery effect caused by
the rock-crack deformation was also been simulated. It can be said that the research of this paperprovides some scientific references for the effective development of volcanic gas reservoirs.

Key words: double-porositymedia, numerical simulation, volcanic gas reservoir, rock deformation, Songliao Basin