Study on the macroscopic heterogeneity of the reservoir in Bozhong 25-1S Oilfield

To improve the exploitation effect, microfacies type, rhythm characteristic of intrastratal resevior, distribution characteristics of interlayers, geometric shape of sandbody, drilling ratio, porosity, and the permeability of shallow water delta depositional system in the lower part of Minhuazhen Formation were analyzed, quantitative analysis and half-quantitative analysis were made to illustrate the macroscopic heterogeneity of the reservoir. The controls of sedimentary microfacies on the main oil section in the research area and the strong intrastratal, interstratal and plane heterogeneities are revealed. Finally, based on the study results, some reasonable advices were given.