Study on Water Flooding Characteristics of Carbonate Reservoirs Affected by High Permeability Layers and Micro-fractures-Taking K Reservoir in a Middle East Oilfield as an Example

摘要

High permeability layer and micro-fracture are important factors affecting water injection development in carbonate reservoirs.It is an important basis for recognizing and evaluating this kind of reservoir,improving its utilization degree and ensuring its development effect to clarify the characteristics of water drive flow in this kind of reservoir.Steady high permeability zones are developed laterally in K reservoir of a Middle East oilfield,and micro-fractures are developed in reservoirs with high structural position.Stereo injection-production pattern of horizontal wells with bottom injection and top production is adopted [1].In recent years,some key problems have emerged in the process of oilfield development,such as rapid increase of water cut and low recovery.Based on the four flow channels of pore,micro-fracture,high permeability and pore,high permeability layer and micro-fracture in this paper.The law of water cut rising in production wells is summarized.To establish the model of oil saturation and resistivity by using wells.Comparative Analysis of Logging Curve Characteristics,the driving mode of injection water is established and the distribution characteristics of remaining oil are summarized.In conclusion,the flooding regime is summarized as follows:the fractures constitute vertical flow highways for the injected water,and the high permeability layer constitutes the horizontal flow highway.Providing guidance for development and evaluation of similar reservoirs.