EVALUACIÓN DE ELECTROFACIES EN UN YACIMIENTO DE LA FRANJA PETROLERA NORTE CUBANA

Electrofacies evaluation in a deposit of Cuban Oil North Belt

Abstract

This paper shows the results obtained after applied multivariate statistical classification techniques on geophysical logs in wells located in Cuban Oil North Belt, in Habana del Este field.  The well logs geophysics employed were: natural gamma radioactivity, photoelectric absorption coefficient, total porosity, density, electrical resistivity and caliper. The aim was identifying electrofacies corresponding to seals and reservoirs. The applied procedure integrated the statistical descriptive techniques, main components and  K-means algorithm like unsupervised multivariate statistical classification. It was possible to distinguish four main electrofacies associated with seals and reservoirs. The electrofacies that constitute the seals are related to Vega Alta Formation and are characterized by their high clay content. The electrofacies that represent the collectors are associated with Veloz Group and are made up of sequences with a predominance of carbonates or sandstones, fractured and porous, little clayey. An electrofacies stands out with  organic matter presence, where carbonates predominate and which constitutes the main reservoir. The application of these procedures contributes to reduce oil prospecting risks.