--> Abstract: Laminated Sandstones Reservoir Characterization, Middle Eocene Lower Misoa Formation, Ceuta Field, Maracaibo Lake, by F. Chacartegui, M. C. Coll, J. Urdaneta, J. Pinto, and D. Lugo; #90988 (1993).
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CHACARTEGUI, FERNANDO, MARIA C. COLL, JORGE URDANETA, JOHNNY PINTO, and DIOGENES LUGO, Maraven, S.A., Caracas, Venezuela

ABSTRACT: Laminated Sandstones Previous HitReservoirNext Hit Previous HitCharacterizationNext Hit, Middle Eocene Lower Misoa Formation, Ceuta Field, Maracaibo Lake

This study presents the results of a multidisciplinary, project and methodology used to describe a clastic Previous HitreservoirNext Hit, known as C-2/C-3, characterized by thin sandstones Previous HitunitsNext Hit masked by a mainly argillaceous sequence. The area, known as Area2 of the Ceuta field, is located to the southeast of the Maracaibo Lake, comprising an area of 75 sq km. Sedimentological facies description, Previous HitcharacterizationNext Hit and analysis resulted in the identification of seven different lithofacies, of which only two are productive. Additionally, ten sedimentary Previous HitunitsNext Hit were recognized, based on related facies associations and nature of facies contacts. These sedimentary Previous HitunitsNext Hit were deposited by a prograding, fluvially-dominated delta in a large estuarine environmental setting. Integration of sedimentological and pet ophysical data were used to recognize and predict prospective intervals from well logs and to characterize them. A deconvolution of MICRO LOG resistivities proved to be the most successful technique to delineate productive intervals, and set the basis for Previous HitflowNext Hit unit identification. Production data, integrated with petrophysical and sedimentological parameters, were used to identify and characterize six Previous HitflowNext Hit Previous HitunitsNext Hit from the entire sequence. Log correlations, based on the sedimentological framework and stratigraphic

sequence analysis techniques, in addition to 3-D seismic interpretations, were used to stablish the external geometry and extension of Previous HitflowNext Hit Previous HitunitsNext Hit and thus, delineating the areal and vertical limits of the Previous HitreservoirNext Hit. Previous HitReservoirTop application of this project include successful placing of appraisal wells to the south, grass-root drilling to the north, optimization of workover wells over the entire area and a more realistic reserves quantification.

AAPG Search and Discovery Article #90988©1993 AAPG/SVG International Congress and Exhibition, Caracas, Venezuela, March 14-17, 1993.