Since conventional gas reservoir productivity equation is difficult to accurately evaluate the productivity of fractured-porous carbonate gas reservoirs, Kazemi model was adopted to simplify the seepage model of fractured-porous carbonate gas reservoirs, the dual-medium complex seepage was decomposed into the linear seepage in substrate layer and the radial seepage in horizontal fractures according to the different flow states of gas in fracture and substrate layer, the steady productivity equation of fractured-porous carbonate gas reservoirs was established with consideration of fracture permeability, fracture opening, fracture number and channeling coefficient, and the productivity sensitivity of gas wells was analyzed. The results showed that the open-flow capacity increased with the increase in the permeability, openness and number of fractures, presenting a positive linear relationship; the open-flow capacity of gas wells increased with the increasing channeling coefficient, and remained unchanged when the channeling coefficient was greater than 5×10-9. This study provides a new solution for steady productivity prediction of fractured-porous carbonate gas reservoirs.
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