A detailed seismic interpretation for reservoir characterization is a powerful tool to obtain information in the inter-well area for the purposes of field management and development. This paper presents a workflow approach to characterize La Victoria Field reservoirs, which belongs to Apure State in the Southwest of Venezuela, particularly Escandalosa M Sand of Escandalosa Formation. The available 3D seismic data have been used to predict small-scale faults as well as presence of internal compartments where undrained zones or bypassed oil might be located in a mature oilfield. Additionally, reservoir engineering techniques as numerical simulation helped to verify reservoir parameters estimated by history matching in a black oil simulator, such as the sealing character of some faults, identified from seismic interpretation.
Introduction
La Victoria Oilfield is located in Apure State, Southwest of Venezuela, specifically at 60 km to the Southwest of Guasdualito Village and 6 Km to the West of Colombian - Venezuelan boundary, between Uribante - Apure Rivers (North) and Arauca River (South). This oilfield produces from Tertiary and Cretaceous reservoirs.
The Escandalosa M Sand is a cretaceous unit, which highly homogeneous; consequently, the structural characterization is the key in order to find drilling opportunities in this field. Seismic attributes reveal features and patterns; which can be useful to understand the geological structure and to build a robust 3D geomodel. Also, this reservoir represents a mature reservoir, in consequence is necessary to do a detailed geological and geophysical and reservoir engineering analysis to find undrained zones or bypassed oil to propose an optimal placement of a well.
The aim of this work is to present a methodology for creating an Integrated Structural Geological Model from seismic attributes and well logs in order to build a 3D geomodel that reproduces as exactly as possible the small geological features, and finally create the simulation model which allows identifying undrained zones. Although this work was made along of all oilfield, we will focus this article on the northern part of the field, because was there where the locations were proposed and drilled with excellent results, confirming the results of this study.
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