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Fault Seal Analysis Effects in Delineating the Movement Of Water Injection and Identifying New Infill Locations and Possible Upside Locations – Near Field Exploration, Ras Budran Field - Gulf of Suez


Ras Budran oil field is located in the offshore NE-dipping central province of the classical asymmetric Gulf of Suez rift basin. The field includes three major structural blocks due to its articulation by the two dominated sets of NE and NW-striking faults. The field was discovered in 1977 after the successful drilling of EE85-1. Currently the field is developing from three platforms by using water injection from three wells. The poor quality of pre-Miocene structure imaging due to the thick sedimentary section of Miocene evaporates and shales stand against the development activity in Ras Budran oil field. The studied field comprises a sedimentary sequence of Paleozoic to Recent rocks which are separated by several stratigraphical hiatus. The oil is produced from multiple clastic reservoirs of the Paleozoic and Early Cretaceous age. These multiple reservoirs are divided into 7 reservoir units and are separated vertically by multiple non-reservoir layers of shale, kaolinite and carbonates which act as pressure barriers vertically between the different reservoir units. Due to the complexity of the structure and the high number of faults which affecting the structure of Ras Budran, the horizontal pressures between the different blocks are also affected as a result of the lithology juxtaposition along the faults. These complexity led to not delineating the movement of the water injection from block to another which resulted in considering some blocks are watered out. The main objective of the present work is to study the fault seal analysis of this complex structure using the 3D static model to control the oil and injected water migration vertically and horizontally from block to another. The lithology, properties, production and pressure data will be used to delineate the movement of the water injection and consequently led to identify new infill locations and possible upside potential locations which are considered to be near field exploration. The study resulted in verifying several prospects and leads which gave positive indications to add additional reserves. Currently we are going to evaluating the possibility of drilling these areas.