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The Sulcis coal basin: characterization of the reservoir

pubblicazioni - Presentazione

The Sulcis coal basin: characterization of the reservoir

Viene illustrata la metodologia di realizzazione di un modello 3D di simulazione numerica per il bacino carbonifero del Sulcis mediante il Sistema Integrato di Analisi Modellistica GeoSIAM. Vengono descritte le fasi di realizzazione del modello geologico statico, del modello di simulazione fluidodinamica e geomeccanica e vengono discussi diversi scenari di iniezione, variando la portata di iniezione ed il numero di pozzi, allo scopo di verificare le condizioni di fattibilità del processo di stoccaggio.

The numerical modeling plays a fundamental role in the characterization of geological reservoirs related to geological storage of CO2, and for a proper assessment of the related industrial processes, allowing to verify their technical feasibility, short and long term safety and also their economic sustainability.

The methodology tasks to create a detailed 3D numerical model both for fluid dynamic, geothermal and geomechanical analyses through the use of the specific software suite GeoSIAM (Integrated System for GeoModeling Analyses), developed by RSE and applied to simulation of CO2 geological storage, geothermal fields, natural gas geological storage and compressed air energy storage, has been described.

GeoSIAM includes a number of modules, automatically connected, that allow the user to creates 3D models, simulate transient scenarios and post processing results accounting for the different typology of application field.

The methodology is then applied in order to characterize the Sulcis coal basin as a possible reservoir for CO2 geological storage. At first, the creation of the geological static 3D model is discussed, starting from the analysis of available petrophysical and geological information; this model is then used to generate a fully 3D simulation model, including spatial mesh, petrophysical parameters of geological formations and boundary conditions.

Finally, a number of different injection scenarios have been simulated, varying both in space and time the flow rate of injected CO2 and the number and location of wells. The results are analyzed from the point of view of CO2 plume diffusion, overpressure safety limit check and vertical displacement, in order to assess the feasibility of storage accounting for the reservoir capacity.

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