Micro-zonation and characterization of the pre-miocene reservoirs in Ras Budran oil field, gulf of Suez, Egypt

Abstract

The present study deals with Pre-Miocene reservoirs in Ras Budran oil Field as one of the most prolific Fields in Gulf of Suez. The reservoir was thought to be massive sandstone and classified initially to six macro layers. The reservoir model has been rebuilt several times at different stages of its development but still has some problems due to reservoir performance anomalies as shown from continuous reservoir monitoring by Production Logging Tools. These indicate that injected water is overriding oil bearing intervals, suggesting that the reservoir is not massive sandstone as thought but it is very stratified with high permeability streaks which lead to accelerated water breakthrough and non-uniform flood front advance. A new micro-zonation was established where thirty-two micro-zones were defined. The current micro-zonation definition has an internally consistent geological framework. This new micro-zonation definition relates production, pressure test and core-plug porosity-permeability data to the geological descriptions and identifies the main geological controls on vertical and horizontal flow. Key words: Prolific, Massive, Macro layers, Breakthrough, Micro-zonation.