Abstract: Shasiduan bioherm limestone gas reservoir in Ping-fangwang area is the largest uncompartmentalized oilfield in Shengli oilfield with proved reserves of 164.5×10 8 m 3 .Reservoir rock are bioherm limestone with plane and inter-layer heterogeneity as its leading features.Filtration capacity along the axis of gas bearing structure is stronger than that in both flanks.Production decline has gone through firstly from rapid to slow and then from slow to rapid as recovery rate and water-cut increasing rate change in recovery process.