A Geostatistic Approach to upscale Naturally Fractured Reservoirs for EOR studies in the Gulf of Mexico

A real field of study was used to demonstrate the application of the geostatistical workflow to understand the water breakthrough, the developing a new field and the investigation of gas continue injection [EOR] over the oil recovery. It was the original team Geologists and Engineers that studied this field suggested the implementation of geostatistics to address these objectives. The methodology followed has three main steps outlined as: Modelling Geological Continuity, Building High Resolution Geocellular Models, Geostatistical methods for History Match under Geological Control. The chosen field of study to apply this methodology is an off shore naturally fractured reservoir [NFR] containing a volatile oil under-saturated with an initial pressure of 306 kg/cm2 and temperature of 157 oC at 19,000 ft of depth, located in the Gulf of Mexico, Tabasco - Mexico. The main lithology is predominantly Calcites and some Dolomites, this last one affecting the matrix porosity occasioning vugs in the reservoir. This field has a very active aquifer with an average salinity of 100,000 ppm that is shared with neighbor fields. By implementing the results on the field of study its production will go from 60,000 STBPD to a plate of 80,000 STBPD with new wells and platforms.