Identificación, caracterización y mapeo de depósitos conglomerádicos dentro de la Sección Inferior de la Formación Lajas, a través de perfiles de imágenes en el Yacimiento Estación Fernández Oro (EFO)

Abstract

The present final work aims to identify, characterize and map of conglomerate deposits within the Lower Section of the Lajas Formation through of image profiles at the Fernández Oro Station (EFO). The end of it is strengthen the deposition model of these reservoir levels, because the deposit It has an important hydrocarbon development in the province of Río Negro. To achieve the proposed objectives, 19 image profiles of wells that contained sections of the Lajas Formation at EFO, relying on information from 2 crowns available. In addition, electrical profiles and 3D seismic were analyzed. The starting point for the identification, characterization and classification of conglomerate levels in the images was to use information from existing crowns in two wells and compare them with the image profile section in them. After identify the distinguishable characteristics in the image profiles, these were grouped in 2 types: 1) clusters of the supportive class (CI) with sub-rounded clasts between 3 and 6 cm, in powerful bodies (between 1 and 10 m) and 2) conglomerates in levels of little thickness and smaller granulometry, immersed in sandstones (CII). Later they proceeded to locate these in the 17 remaining image profiles. Once the clusters were characterized with these data, maps were generated, the which provided a more detailed view of its distribution for each stratigraphic level. The maps are consistent with the pre-existing idea of ​​an area of ​​close contribution from the south (and possibly from the east) in a deltaic system evolving from a front deltaic to a channel environment and plan as you program. The integration of bibliographic information, outcrops, crowns, profiles standard with image profiles and maps allowed to extend with some confidence, to great extent part of the deposit, the sedimentological characteristics of the bodies generated in high-energy environment of the Lajas Formation.