Evaluación de formaciones reservorio en la cuenca de la guajira, Colombia.

Abstract

The development of this work was carried out with information provided by the National Hydrocarbons Agency (ANH) for the ANH-Unipamplona-LITHoil Ltda project “Geological integration, evaluation of oil systems and prospectivity of the border basins of Colombia: Guajira basins and Guajira offshore”. Its objective is the evaluation of the petrophysical characteristics of the wells (Well 1, Well 2 and Well 3) located in the Guajira basin, Colombia; by analyzing well reports, well logs, cores, among others; for the identification of electrofacies and the calculation of petrophysical properties. By means of the Hydrocarbon Data System, Inc. software, the electrofacies (clay, sandy clay, limestone, mudstone, sandstones and basement) were identified for each well, presenting mostly clay stones, this was corroborated with the clay volume calculated from 60 to 95%. The sequences were correlated with geological formations, sequences 1 and 2 belong to the Gallinas formation, sequence 3 to the Castilletes formation, sequences 4 and 5 to the Jimol formation, sequence 7 to the Siamaná formation, sequence 9 to the Macarao formation and in sequences 4_2 and 10 the formations could not be identified. Well 1 presented effective porosity of 15% classifying the rock quality as satisfactory, Well 2 and Well 3 present very poor rock quality with less than 5%. The data from the Perla Field, Venezuela was correlated with the present work for the identification of cutoff values and the calculation of net reservoir and net pay, these values yielded non-commercial results for the three wells.