Monte Enoc Field, Southern Apennines, Italy: Static and Dynamic Modeling of a Fractured Reservoir

Mazzucchelli, Davide, Rosa Atena, Federico Cappanera, Stefano Mantica, ENI E&P, San Donato Milanese, Italy

Monte Enoc is a part of the Monte Alpi-Monte Enoc field in the complex geological set­ting of Val d’Agri area. It is a carbonate reservoir composed of lithologies ranging in age from Middle Cretaceous to Miocene where the main productive intervals are related to frac­tured zones. The analysis of M.Enoc Area in terms of fractures distribution and their hydraulic parameters has been performed using Discrete Fracture Networks (DFN) accord­ing to ENI-E&P methodological approach, focused on understanding possible relations between geological features, fractures and observed flow patterns.

The geological complexity of the field and the consequent uncertainties required the inte­gration of information derived from seismic, image log interpretations, petrophysics meas­urements and production data for the construction of three different possible static scenar­ios, related to different hypothesis of fractures generation and distribution (Geometrical, Fault related, Stress Field related).

Each “conceptual model” has been ranked according to its capability to reproduce the pressure response of a Long Production Test simulated using a Finite Element code and an optimization loop. This consists in calibrating the hydraulic parameters, such as fracture porosity and permeability, in the attempt to minimize the mismatch between the simulated and measured data.

Once the most suitable conceptual model has been established, it is possible to upscale the static and dynamic properties to be used in a ‘dual porosity’ dynamic simulation model. This integrated workflow has been applied to the static and dynamic characterization of M. Enoc area and has led to a better definition of the productive mechanism at field scale.