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2011

Reservoir and mathematical modellings for calculating hydrocarbon in place using well log data

Author:Egbai J.C, Ihianle, O.E and Aigbogun, C.O

Abstract:
A characterization and volumetric analysis of Olomoro field was carried out using data provided by Shell Petroleum Development Corporation in order to determine the reservoir lithology, structure properties and hydrocarbon in-place. The data provided were well logs, structural map and the seismic section of Olomoro field. The well logs utilized included gamma ray, resistivity, caliper, density, neutron and sonic logs. Through the gamma ray log, it was discovered that the interval under investigation had four porous and permeable zones or reservoir interval. The resistivity log revealed with exception of the first to the third reservoir layer of well 1, presence of hydrocarbon which was used to calculate resistivity of the formation and water. The water saturation was calculated which in turn was used to calculate the hydrocarbon saturation. The values derived were used to estimate the hydrocarbon in place within the depth of 3,429m and 4,053.84m for an area of 100km2. These gave a total of 4.012 x 109m3 or 2.5234 x 1010 barrel as the hydrocarbon in-place. It was observed through the structural map and the seismic section that the hydrocarbon trap is a structural trap created by two fault plains and a folded anticline.