X oilfield is a complex diamictite carbonate oilfield located in the Middle East, and Asmari formation is the main pay zone. According to the reservoir study, the basic characteristics is determined. This paper shows the fact that the permeability of well logging interpretation/core analysis is very different from that based on dynamic analysis (usually much lower), and presents the method of tubing flow—Rate Transient Analysis(RTA) integration, as a bridge connecting the position of pump intake and subsurface, to analyze the authentic permeability (dynamic permeability), on account of the situation that there is no downhole pressure gauge in the oilfield. Moreover, based on the PTA(pressure transient analysis)/RTA, this paper has explored a way of classifying and characterizing the reservoir types via multivariate analysis. The results are applied to reservoir simulation, reservoir potential tapping for different types of reservoir. The research of this paper could be referred to for the efficient development of similar oilfields to some degree.