ISEA, ANDREINA, FREDDY LEON, BERNABE AGUADO, and HERMES MALCOTTI, INTEVEP, S.A., Caracas, Venezuela

ABSTRACT: Integrating Geological, Geophysical and Reservoir Engineering Data to Describe a Reservoir: El Furrial Field, Northern Monagas Area, Venezuela

The El Furrial Field, Eastern Venezuela, represents one of the most prolific areas in hydrocarbon production in the country, due to its high production rates from Cretaceous and Tertiary rocks.

This paper deals with an integrated approach to describe this reservoir through the analysis of geological, geophysical and reservoir engineering data. The study of sedimentary facies in 3000' core and mineralogical and diagenetic characterization of the sandstones was added to seismic amplitude and petrophysical analysis, inverse modelling, pressure tests, production histories and completion reports of 20 wells to develop a conceptual model which helps to-establish reservoir heterogeneities.

Three different production units are identified in the interval, which showspecific sedimentological and petrophysical properties. The analysis ofdensity-transit time vs. gamma ray crossplots, combined with the surface seismic inversion corroborate the presence of these the three units, which show very good lateral extension and only local vertical restrictions. The results obtained clearly show that the geophysical characterization ofreservoirs can be a very useful tool to be applied to any geological model, and, in consequence, improve hydrocarbon recovery.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.