Study on Geological Characteristics and Distribution Law of Remaining Oil in Changqing H Area

After years of water drive development in H area of Changqing low permeability reservoir,the degree of geological recovery is high, and the rate of water cut rise is accelerated, it is urgent to study the law of remaining oil distribution to provide basis for reservoir development adjustment. Firstly, different methods were used to calculate the initial oil saturation and the current remaining oil saturation in H area, and the remaining oil distribution law after water flooding was clarified by comparison; Secondly, the factors that affect the distribution of remaining oil were analyzed: structure, sedimentary facies, interlayer and reservoir heterogeneity, the remaining oil potential of each layer in the test area was defined, and the favorable intervals of production Wells were proposed, which laid the foundation for the development and adjustment of the next reservoir, it lays a foundation for the development and adjustment of reservoir in the next step.