Abstract
In this study, the sustainability of low-temperature geothermal field exploitation in a carbonate reservoir near Mondragone (CE), Southern Italy, is analyzed. The Mondragone geothermal field has been extensively studied through the research project VIGOR (Valutazione del potenzIale Geotermico delle RegiOni della convergenza). From seismic, geo-electric, hydro-chemical and groundwater data, obtained through the experimental campaigns carried out, physiochemical features of the aquifers and characteristics of the reservoir have been determined. Within this project, a well-doublet open-loop district heating plant has been designed to feed two public schools in Mondragone town. The sustainability of this geothermal application is analyzed in this study. A new exploration well (about 300 m deep) is considered to obtain further stratigraphic and structural information about the reservoir. Using the derived hydrogeological model of the area, a numerical analysis of geothermal exploitation was carried out to assess the thermal perturbation of the reservoir and the sustainability of its exploitation. The effect of extraction and reinjection of fluids on the reservoir was evaluated for 60 years of the plant activity. The results are fundamental to develop a sustainable geothermal heat plant and represent a real case study for the exploitation of similar carbonate reservoir geothermal resources.
Highlights
The total potential energy of a geothermal reservoir depends on many variables such as thermal regime, geological structure, and hydrogeological properties
In order to evaluate the sustainability of this use, the temperature field in the ground was modeled over a period of time in which the source was continuously used at the full capacity of the plant
It is worth noticing that in the case of injection in the fault the disturbance tends to be more concentrated in the same fault region, decreasing its effect on the other layers of the domain
Summary
The total (electric and thermal) potential energy of a geothermal reservoir depends on many variables such as thermal regime, geological structure, and hydrogeological properties. Few sustainability middle-high enthalpy and deep geothermal reservoirs, establishing several dynamic relations between exploitation analyses on fractured carbonate rocks have been done [53,54] and they mainly focus on the properties of the equivalent porous medium and fracture aperture. They found that the a low enthalpy geothermal system has been proposed by Cherubini et al [55], who simulated a width and permeability of the fault significantly affect fluid flow and thermal field, with a concentration fractured geological system, composed of a single homogeneous layer with an inclined fault They of thermal perturbation within the fault plane. In the present a sustainability analysis of the exploitation, by means of a well-doublet
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