Characterization of Dense Gas Reservoirs and Investigation on Control Factors in the Reservoir

Summary Sulige gas field is a typical inefficient tight sandstone gas field, evident by its sophisticated geology, low-permeability, low-porosity, low-abundance and strong heterogeneity. It is their thin effective thickness and poor continuity that makes the prediction of reservoir extremely challenging. In this research, we took X area as an example to investigate the methodology of low-permeability sweet reservoir prediction, by using the seismic facies reservoir characterization technique. Based on fundamental rock physics, the relationship between elastic parameters and reservoir characteristics was established, then methodology of prestack elasticity parameter simulation is used to predict the effective reservoir. In addition, with the help of detailed characterization of small faults and the law of gas-water distribution, the main control factors of gas-water were identified. It was clear that gas content was better in the hidden fault zone. This study showed evident geological effect on the exploration and development of low-permeability thin reservoir in Sulige gas field.