FERRER, FERNANDO, EUGENE RHODES, and JOSE NORENO, Maraven, S.A., Caracas, Venezuela

ABSTRACT: Mapping of Production Indices at Ceuta Field, Maracaibo Basin, Using Historical Data to Confirm Development and Injection Sites

Ceuta Field in the southeastern part of Maracaibo Basin, was discovered by exploration drilling in the 1970's. Now, as the field enters maturity and preparations are in progress for secondary recovery, a large amount of data has been screened prior to the location of additional development wells and the placement of injection sites.

Reservoir data that include production histories, when combined with facies analysis have been used to assign production indices to individual reservoirs. These indices were mapped and productivity trends indicated flow unit geometries. This flow unit approach is strictly empirical and requires validation with another independent line of evidence. In the case of Area 8 within Ceuta Field, mappable flow units were compared with seismic attribute maps extracted from recently acquired 3-D seismic data.

Comparison of flow unit maps with seismic attribute maps offered additional confidence in decisions concerning development and injection wells. Utilization of historical data to calibrate 3-D seismic data offered a direct detection method for the mapping of reservoir quality in this field. These interpretations were used to calibrate a simulation model for the Lower Eocene B reservoir unit within Area 8. This model predicts that the proposed waterflood project will increase reserves from 107.4 MMBO of primary production to a total of 209.6 MMBO for primary and secondary production. Recovery efficiency will increase from 17.4% to 34.0% after completion of the waterflood program.

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