Abstract:

Taking the No.1 Sebei gasfield in Qinghai Province as an example, this paper deals with flow units study of gas reservoir. According to the analysis of various reservoir parameters, the relative amplitudes of the SP and the GR curves are selected as the main parameters to separate the flow units into different types. Using those two parameters, the target formations in this zone are sorted into five types, in which, the reservoir qualities of the flow unit types I and II are the best and mainly developed in reefs with high energy;the reservoir quality of the flow unit type III is the better and can be mainly found in reefs with moderate energy; the reservoir quality of the flow unit type IV is the worst and its sedimentary back ground is the reefs with lowest energy; while the flow unit Ⅴ is mud layer and it can be a kind of seepage barrier.The distribution model of flow units and the control effect of fluid distribution system of the study area are made through the integrated analysis. 

Key words: flow unit, reservoir, No.1 Sebei gasfield, gas reservoir