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Ernest Gomez1, R. Y. Elphick1, G. S. Forrest1, E. R. Gustason1, D. E. McChesney1, M. A. Vivas1, M. A. Munoz1, M. F. Doe1, H. M. Bressler1, J. A. Gonzalez2, M. Rampazzo3, B. Chan3, O. Rivas2, J. Urdaneta2, R. A. Ripple4
(1) Schlumberger Holditch Reservoir Technologies, Denver, CO
(2) PDVSA, Maracaibo, Venezuela
(3) PDVSA, Caracas, Venezuela
(4) ARCO/VICO, Jakarta, Indonesia

Abstract: The use of a Multi-Disciplinary Team Approach in the Reservoir Characterization of a Mature Field, Alto de Ceuta, Block VII, Lake Maracaibo, Venezuela

Alto de Ceuta (ADC) Field is located along the Pueblo Viejo Fault (PVF) in the southeastern part of Lake Maracaibo. Since its discovery in 1957, ADC has produced over 489 MMBO from the Miocene Lagunillas and Eocene Misoa formations. ADC formed during reactivation of the PVF during the late Oligocene (?) - early Miocene. The structure forms where the left-lateral PVF makes a right-handed overstep causing inversion of the Eocene and Miocene strata. Conventional subsurface mapping techniques were inadequate to characterize the field and required a highly integrated approach to resolve. A multidisciplinary team consisting of engineers, geologists, geophysicists and petrophysicists was assembled to characterize and build a simulation model and develop a reservoir optimization plan. All available data were used and honored in the integration process. Available data included low frequency 3-D seismic, conventional open hole logs from over 200 wells, 5 cores with routine core analysis, and production and pressure measurements. Pressure measurements and production history were combined with the log analysis, core description, log correlations, Statistical Curvature Analysis Technique (SCAT), seismic interpretation and mapping to define fault compartments. This integrated analysis found that the ADC Field is a mature, highly complicated reservoir with multiple fluid contacts and numerous compartments.

Based on the new geologic model a total of 195 reservoir compartments were recognized. Recommendations were made for workovers/recompletions, infill production and injector locations along with deeper exploration targets. The geologic model is now undergoing numerical simulation for history match and a reservoir optimization plan.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana