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Atlas b) Stratigraphic, such as paleo-currents, reservoir geometries, widths and sedimentary paleoenviroments. TX 75083-3836, U.S.A., fax 01-972-952-9435.The identification of high-water-saturation zones in a reservoir is an important task but it has proven to be very difficult if it is based only on logging interpretations. The intention of this study is to include the response from electrical images for the identification of high-water-saturation zones which may produce high volumes of water or only water.Some special responses from borehole electrical images were observed in some wells of Borde Montuoso and Puesto Hernández fields in the Neuquén basin. The integration of openhole logs data, core studies and production information proved to be a useful complementary tool for the accurate identification of high-water-saturation zones and oil-water contacts. AbstractTraditionally, wellbore images logs have been used to perform structural and stratigraphic analyses. This study presents an approach of the resistivity image oriented to the identification of aquifers, further enlarging the application scope of this tool. From the analysis of borehole resistivity image logs, special image characteristics were observed, which were not related to their traditional application. Consequently, an analysis was carried out integrating well logs and interpreted core data for two different areas and formations located in Argentina in the Neuquén Basin: once at Lower Troncoso Member of the Huitrin Fm (Aptian), and the other at the Sierras Blancas Fm (Kimeridigian). This particular response from resistivity images was calibrated to reservoir zones with high water saturation, corresponding to aquifers.Hence, the objective of this work is to provide information about the use of a tool with high vertical resolution and accurate readings and which under certain conditions can be used for the identification of high-water-saturation zones.

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