关键词: 气藏, 天然气, 输导速度, 输导效率, 聚集效率, 渗透率

Abstract: The factors for influencing transporting capacity of natural gas flowing in transporting pathway were analyzed on the basis of Darcy's law.A series of methods for studying gas transporting efficiency of gas reservoirs were established by using gas transporting velocity.The gas transporting efficiencies of nineteen large-medium gas fields in China show that there is a great difference in gas transporting velocities of the different large-medium gas fields.The large-medium gas fields with fault transporting pathways have obviously higher gas transporting velocities than those with sand-body transporting pathways,because the large-medium gas fields with fault transporting pathways have bigger permeability of fault and vertical distance from source-rock to trap than those with sand-body transporting pathway.The relations between gas accumulation efficiency and gas transporting efficiency of 19 large-medium gas fields show that the required gas transporting efficiency for forming the high-efficiency large-medium gas fields is over 1.96 nm/s,and required gas transporting efficiency for middle-efficiency gas field is from 1.96 nm/s to 0.15 nm/s.The required gas transporting efficiency for low-efficiency gas field is less than 0.15 nm/s.

Key words: gas reservoirs, natural gas, transporting velocity, transporting efficiency, accumulation efficiency, permeability