A reservoir model is built with the fluid facies-controlled property parameters for few available drill data of a shallow gas field in Yinggehai basin. Using the results of the seismic fluid inversion of P/S waves ratio before stack and the logging interpretation, a fluidfacies-controlled model is done by stochastic reservoir modeling and then under the fluidfacies model, a porosity parameter model with varying wave impedanc is stimulated, which can solve the problem that the distribution of reservoir properties is unable to stimulate rightly with the common method due to likely high porosity in gas-bearing beds. Based on the porosity model, connectivity factors are calculated and inner boundaries of reservoir porosity are described. This result has interpreted the distribution characters of pressure and gas types in study area.